107 results about "Hydrogen absorption" patented technology

The present invention relates to a metal hydride hydrogen storage container which is easy to disassemble and can effectively exchange heat, and relates to the technical field of hydrogen storage containers, and in particular to a metal hydride hydrogen storage container which is easy to disassemble and can effectively exchange heat. The present invention comprises: a hydrogen storage alloy tank, a sleeve, a flange and a hydrogen valve; the hydrogen storage alloy tank is installed in the sleeve, and the flange is sealed and connected by a rubber gasket and flange bolts and nuts; a hydrogen valve is installed at the center of the flange; and the interior of the hydrogen storage alloy tank is filled with hydrogen storage alloy powder. The technical solution of the present invention solves the problems in the prior art that the hydrogen storage alloy generates stress on the inner wall of the container due to lattice expansion during the hydrogen absorption process, causing the container to deform and affecting the service life of the container; the hydrogen storage alloy has poor long-term cycle stability and needs to be frequently replaced; the hydrogen storage alloy has poor thermal conductivity and the hydrogen storage device needs to transfer heat to the outside world.

The invention provides a hydrogen charging management method of a solid hydrogen storage device, and relates to the technical field of hydrogen storage, the method comprises the following steps: connecting a hydrogenation gun into a first gas inlet end of the solid hydrogen storage device, and charging hydrogen with a preset hydrogen flow into the solid hydrogen storage device; controlling the exhaust end of the solid hydrogen storage device to exhaust the hydrogen subjected to heat exchange; a circulating pump is started, hydrogen exhausted from the exhaust end is input into a cooling device through a circulating pipeline to be cooled, and the cooled hydrogen is filled into the solid hydrogen storage device through a second gas inlet end of the solid hydrogen storage device through the circulating pipeline; and when the solid hydrogen storage material in the solid hydrogen storage device reaches a hydrogen absorption saturation state, hydrogen charging is stopped. The solid hydrogen storage device can be filled with hydrogen of the preset hydrogen flow, heat generated by hydrogen absorption of the solid hydrogen storage material in the solid hydrogen storage device is brought out of the solid hydrogen storage device, the solid hydrogen storage device discharges a small amount of hydrogen after hydrogenation is completed, and safety is high.

The invention relates to an AB2 type hydrogen storage alloy and a preparation method and application thereof, the AB2 type hydrogen storage alloy comprises a matrix metal and a second metal, and the composition general formula of the matrix metal is Ti Zr Cr < c > Mn < d >; wherein 0.76 < = a < = 0.9, 0.16 < = b < = 0.24, 0.76 < = c < = 0.84, 1.05 < = d < = 1.2, and a + b + c + d = 3; and the second metal is metal except Ti, Zr, Cr and Mn. The composition of the matrix metal in the AB2 type hydrogen storage alloy is limited, the number of atoms of all elements is limited, meanwhile, the second metal is added, the prepared AB2 type hydrogen storage alloy is high in effective hydrogen storage capacity and small in hydrogen absorption and desorption platform hysteresis, and the high hydrogen storage capacity can still be kept after 3000 times of hydrogen absorption and desorption circulation.

The invention discloses a high-temperature solid hydrogen storage device capable of being quickly started at normal temperature. The high-temperature solid hydrogen storage device consists of a hydrogen storage unit, a heating system, a gas supply system, a shell and a temperature control device, the hydrogen storage unit is composed of a solid hydrogen storage material bed layer trigger area, a solid hydrogen storage material bed layer sweep area and a bed layer support; the heating system consists of a power supply channel and an electric heating element; the gas supply system consists of a gas inlet / outlet, a filter screen and a clearance space; the shell is composed of a hydrogen storage tank barrel, a hydrogen storage tank end cover, a sealing gasket and a threaded sleeve. The temperature control device exchanges heat through heat exchange fluid. The invention discloses a control method of a high-temperature solid hydrogen storage device based on normal-temperature quick start. The control method comprises the following steps: 1, preparation before hydrogen absorption; 2, starting a hydrogen absorption process; and 3, controlling the hydrogen absorption process.

The invention discloses a solid hydrogen storage tank and a hydrogen storage system, and the solid hydrogen storage tank comprises a hydrogen storage tank body which is provided with a hydrogen feeding port and a hydrogen discharging port and is internally provided with a hydrogen storage alloy; the fixed base is provided with a placing groove, and the bottom of the hydrogen storage tank body is embedded into the placing groove; the cooling module at least comprises a cooling coil, and the cooling coil is arranged at the bottom of the containing groove; and the heating module at least comprises a heating pipe, and the heating pipe is coiled on the peripheral wall of the hydrogen storage tank body. The cooling module is arranged at the bottom of the hydrogen storage tank body, and the heating pipe is wound on the outer wall of the hydrogen storage tank body. The cooling module and the heating module can be used for controlling the hydrogen storage alloy in a corresponding temperature environment according to requirements, so that the effects of hydrogen absorption and hydrogen desorption are achieved. The heating module is used for heating, the cooling module is used for cooling, the temperature control process is faster, temperature control is more accurate, the temperature adjusting efficiency is improved, and then the hydrogenation and hydrogen desorption efficiency is improved.

The invention relates to the field of hydrogen refueling stations, in particular to a hydrogen absorption and desorption control method and system for a solid hydrogen storage system. The method comprises the steps that the current temperature and the current pressure of the solid hydrogen storage system are collected in real time; inputting the current temperature, the current pressure and the temperature and the pressure corresponding to the optimal hydrogen absorption / hydrogen desorption efficiency into a PID (Proportion Integration Differentiation) controller to output a control signal so as to control the current hydrogen absorption / hydrogen desorption process; the temperature and the pressure corresponding to the optimal hydrogen absorption / desorption efficiency are obtained by performing multi-target optimization on the target fitting curve. According to the scheme, the coupling reaction of temperature and pressure can be comprehensively considered, and the accuracy of hydrogen absorption / hydrogen desorption control is improved.

The invention provides a multifunctional detection device and method for a hydrogen absorption and desorption process of a metal hydride, the multifunctional detection device is used for hydrogen absorption and desorption performance test, internal expansion stress test and external strain test, the multifunctional detection device comprises a stress sensor arranged in a hydrogen storage tank, and the sensing end of the stress sensor is flush with the inner surface of the hydrogen storage tank; the strain gauge is arranged on the periphery of the straight cylinder body between the upper and lower flanges of the hydrogen storage tank; the mass flow meter is arranged in the hydrogen absorption and desorption pipeline; the electric signal acquisition card is electrically connected with the stress sensor and the mass flow meter; the strain gauge is electrically connected with the strain gauges; the device has the following beneficial effects: the device can simultaneously monitor the real stress change process in the tank and the strain change process outside the tank in the hydrogen absorption process and the hydrogen desorption process of the metal hydride in the hydrogen storage tank and test the hydrogen absorption and desorption performance; and an accurate and efficient evaluation method is provided for manufacturing, filling and using safety of the metal hydride hydrogen storage tank.

The invention relates to the technical field of solid hydrogen storage alloys, and discloses a method and a system for predicting a hydrogen absorption and desorption curve of a solid solution hydrogen storage alloy and a readable medium. The prediction method comprises the following steps: acquiring basic data of a to-be-detected alloy; obtaining simulation conditions of hydrogen absorption / desorption, wherein the simulation conditions comprise a hydrogen composition step length and a reaction system temperature; then according to the basic data, thermodynamic property parameters of hydrogen absorption / desorption of the to-be-tested alloy under the simulation condition are calculated; calculating the balance pressure of the to-be-measured alloy in the hydrogen absorption / desorption process based on a Van Tough equation in combination with the thermodynamic property parameters; and finally, repeatedly executing the previous steps for multiple times, changing the temperature of the reaction system in the simulation condition according to needs each time to obtain multiple groups of hydrogen concentration and equilibrium pressure relation data at different temperatures, and forming a pressure-composition-temperature curve of hydrogen absorption / desorption of the to-be-detected alloy. According to the method, the hydrogen absorption PCT curve and the hydrogen absorption enthalpy change of the BCC solid solution alloy can be rapidly predicted, so that a theoretical basis is provided for design and optimization of hydrogen storage alloy.

The invention belongs to the technical field of solid hydrogen storage, and particularly relates to a hydrogen storage alloy hydrogen absorption and desorption platform pressure and enthalpy change regulation and control method. The method comprises the steps that S1, hydrogen storage alloy is obtained through smelting, and the surface of the hydrogen storage alloy is polished; s2, the hydrogen storage alloy is placed in a high-temperature furnace, and the high-temperature furnace is cleaned; s3, a heating program of the high-temperature furnace is set, the initial temperature is room temperature, then the temperature is increased to 900-1400 DEG C at the heating rate of 100-300 DEG C / h, then heat preservation is conducted for 1-8 h, and then natural cooling is conducted; and S4, when the temperature in the high-temperature furnace is reduced to 30 DEG C or below, the hydrogen storage alloy is taken out, the hydrogen storage alloy is sequentially polished, cleaned and dried, and the regulated hydrogen storage alloy is obtained. By optimizing heat treatment parameters, the performance of the hydrogen storage alloy is remarkably improved, and the requirement for development of the hydrogen energy technology is met.

The utility model discloses a hydrogen absorption machine control circuit based on a solid hydrolysis material, relates to the field of hydrogen absorption machine control circuits, aims to solve the problems of many devices, large volume and complex structure in the prior art, and adopts the technical scheme that a state indicating lamp is directly powered by a single chip microcomputer, the power supply is stable, and the reliability is high. A panel work indicating lamp adopts a double-color RGB indicating lamp, the circuit design is simple, and the control is convenient; the battery power supply voltage detection circuit adopts a resistor voltage division mode and is connected to an ADC acquisition pin of a single chip microcomputer through an operational amplifier voltage following circuit, and an analog ground and a digital ground in the circuit are bridged through a 0R resistor, so that interference between analog signals and digital signals is effectively reduced; a Darlington transistor is adopted as a driving IC, the circuit design is simple, the number of peripheral devices is small, the driving capacity is high, the water pump driving part is in two-way parallel connection, the driving capacity is high, and the circuit stability is high; the screen design of the man-machine interaction unit adopts a serial port HMI, and the interface circuit is simple.

This utility model discloses an integrated high-efficiency heat exchange solid-state hydrogen storage system, relating to the field of solid-state hydrogen storage technology. It includes a hydrogen storage core module, a heat exchange circulation module, and a pressure control module. This integrated high-efficiency heat exchange solid-state hydrogen storage system utilizes a spiral heat exchange tube bundle tightly fitted to the outer wall of the hydrogen storage container, greatly increasing the heat exchange area and significantly improving heat exchange efficiency. This effectively solves the temperature control problem caused by thermal effects during hydrogen absorption and desorption of solid-state hydrogen storage materials. The built-in electric heating element actively provides the heat required for desorption, ensuring the stability and speed of the hydrogen release process. The pressure control module can accurately stabilize the inlet pressure, avoiding the impact of pressure fluctuations on the hydrogen storage material and improving system safety. Simultaneously, the system has high integration and a compact structure, enhancing protection capabilities. Through uniform hydrogen flow and efficient thermal management, it comprehensively improves hydrogen storage density, hydrogen charging and discharging rates, and system operational stability.

The invention discloses a hydrogen storage material variable temperature hydrogen absorption and desorption cycle test method based on a Sieverts constant volume method. In a cycle test of the variable-temperature hydrogen absorption and desorption cycle test method, a single hydrogen absorption and desorption process comprises temperature-dependent hydrogen absorption and temperature-dependent hydrogen desorption of a hydrogen storage material in a closed system, namely, the single hydrogen absorption and desorption process comprises a cooling hydrogen absorption reaction and a heating hydrogen desorption reaction of the hydrogen storage material along with temperature change; the closed system is a constant-volume closed system without hydrogen material exchange with the outside. According to the invention, the hydrogen absorption and desorption cycle test efficiency of the reversible hydrogen storage material can be obviously improved, and the method has the advantages of controllable hydrogen absorption and desorption depth, temperature and hydrogen back pressure, simple process flow, high system adaptability, good controllability, good repeatability and the like. By optimizing and matching the loading capacity of the hydrogen storage material, the intrinsic thermodynamic PCT characteristic, the test temperature and the system volume, the hydrogen storage material can complete rapid hydrogen absorption and desorption circulation under the conditions of controllable hydrogen absorption and desorption depth, temperature and hydrogen back pressure.

The present invention provides a solid-state hydrogen storage device for hydrogen health, comprising a protective box, a hydrogen storage tank, a flow meter and a breathing tube, wherein the hydrogen storage tank, the flow meter and the breathing tube are all arranged in the protective box; a hydrogen storage alloy is stored in the hydrogen storage tank, a pressure reducing valve is provided at the bottle mouth of the hydrogen storage tank, the air inlet of the flow meter is connected to the pressure reducing valve through a hydrogen transmission pipe, and the air outlet of the flow meter is connected to the breathing tube. The device controls the flow rate of hydrogen to 100-200mL / min and the pressure of hydrogen to within one atmosphere by adding a low-pressure secondary pressure reducing valve, thereby meeting the use requirements of a normal hydrogen health respirator. The flow rate of hydrogen can be intuitively displayed by the flow meter, the filter filters the hydrogen, the humidifier in the flow meter increases the moisture content of the hydrogen, and further filters impurities in the hydrogen. The device is easy to operate and the hydrogen absorption amount can be adjusted according to personal preference.

The invention discloses a TiFe-based hydrogen storage alloy and a preparation method thereof, and belongs to the field of metal hydrogen storage materials. The general chemical formula of the TiFe-based hydrogen storage alloy is TiaNdbZrcFedNieMnf, and the atomic percent of each element is as follows: 46 to 53 at% of Ti element, 0.1 to 1.5 at% of Nd element, 1 to 6.5 at% of Zr element, 27 to 40 at% of Fe element, 2 to 10 at% of Ni element and 4.5 to 12 at% of Mn element; wherein Ti, Nd and Zr are first metal elements, Fe, Ni and Mn are second metal elements, and the ratio of the total atomic percent of the first metal elements to the total atomic percent of the second metal elements is 1.05-1.20. The TiFe-based hydrogen storage alloy can be activated at room temperature, has proper hydrogen absorption and desorption platform pressure, and keeps high hydrogen storage capacity and high hydrogen absorption and desorption rate at the same time.

This invention relates to a solid-state hydrogen storage tank and its preparation and filling / discharging methods, belonging to the field of hydrogen storage and transportation technology. It solves the technical problem that the low thermal conductivity of granular and powdered hydrogen storage alloys leads to reduced hydrogen absorption and discharging rates, while existing solid-state hydrogen storage tanks with internal heat exchange structures suffer from complex manufacturing processes and high costs. A solid-state hydrogen storage tank includes a valve, a tank body, a metal mesh array, and granular hydrogen storage alloy dispersedly filled within the metal mesh array. The tank body is a cylindrical, straight-sided bottle shape. The valve fits into the bottle opening of the tank body. The metal mesh array is densely filled inside the tank body and tightly adheres to the inner wall of the tank body. The solid-state hydrogen storage tank of this invention constructs a metal mesh array through the combination of single metal mesh tubes, forming a dense and continuous metal mesh heat transfer network with high thermal conductivity. This reduces the high / low temperature levels of the hydrogen storage alloy bed, especially in the core area, and significantly shortens the hydrogen filling time.

The present application belongs to the hydrogen energy utilization technology field in the clean energy and new energy field, and relates to a hydrogen storage reactor for increasing the contact area between hydrogen storage material and hydrogen, which comprises a reactor main body and a screen assembly, the screen assembly is arranged in the reactor main body, the screen assembly comprises an upper screen, a lower screen and a weighted fixing piece, the upper screen and the lower screen are fixed through the weighted fixing piece, and the upper screen, the lower screen and the weighted fixing piece form a hydrogen storage material sample powder particle reaction space. The reactor adopts the screen assembly to realize convenient sample loading, simple operation, non-blowing, zero sample loss and zero accumulation. The reactor is designed to be through from top to bottom, so that the powder sample particles are contacted with hydrogen in all directions, the reaction with hydrogen is fully realized, hydrogen can quickly enter the interstitial space of the alloy lattice, the hydrogen absorption speed is improved, and the hydrogen storage kinetic performance is improved. At the same time, the error experiment error is minimized, and the data accuracy is improved.

The detachable solid hydrogen storage device comprises a shell and a hydrogen storage container arranged in the shell, a sealable gas inlet and outlet is formed in the shell, a cavity is formed between the shell and the hydrogen storage container, and a heat exchange mechanism and a supporting framework are arranged in the hydrogen storage container; the supporting framework divides the interior of the hydrogen storage container into a plurality of dot matrix units and a heat exchange mechanism containing space, a plurality of through holes are formed between every two adjacent dot matrix units, and the dot matrix units are all used for containing hydrogen storage materials. According to the hydrogen storage device, by arranging the dot matrix units internally communicated with one another, the heat exchange performance of the hydrogen storage device can be enhanced, transmission and distribution of hydrogen in the device can be remarkably improved, expansion stress generated in the hydrogen absorption and desorption process of a hydrogen storage material is shared, and therefore the problem that the reaction kinetics performance of the hydrogen storage material in a local area is reduced is effectively solved; and the deformation or fracture risk caused by stress concentration of the hydrogen storage device is remarkably reduced, and the hydrogen storage device is suitable for solid hydrogen storage.

The invention provides an A2B7 type Y-Mg-Ni series hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage materials. The general formula of the hydrogen storage material is Y1-a-bMgaCbNicDd, 0.05 < = a < = 0.25, 0 < = b < = 0.2, 3.25 < = c < = 3.45, 0 < = d < = 0.2, C is selected from at least one of Ce, Pr, Nd, Sm and Gd, and D is selected from at least one of Mn, Mo, Fe, Ti, Si and W. The pure A2B7 type hydrogen storage material is obtained by carrying out element doping and process modification on the hydrogen storage alloy material, so that the hydrogen storage capacity and hydrogen absorption and desorption cycle stability of the rare earth hydrogen storage alloy can be simultaneously improved, and the hydrogen absorption and desorption plateau pressure can be improved.

The invention discloses a hydrogen absorption and desorption reaction progress quantification method, system and device, a medium and a program product, and relates to the technical field of material science and image processing, and the method comprises the steps: carrying out the preprocessing of a reaction process image, and obtaining a feature image; based on the feature image, gray features or crack texture features related to the hydrogen absorption and desorption reaction progress are extracted; and determining a reaction score according to the gray features or the crack texture features and the features of hydrogen absorption and hydrogen desorption in an equilibrium state, thereby obtaining a quantitative result of the hydrogen absorption and desorption reaction progress. Based on different characteristics of colors and texture forms of a hydrogen storage material before and after hydrogen absorption and desorption, gray features and crack texture features in a reaction process image are extracted, a mapping relation between the image features and the reaction progress is established, a quantitative result is obtained based on the image features, real-time and in-situ non-intrusive monitoring of the reaction progress is realized, and the real-time and in-situ non-intrusive monitoring of the reaction progress is realized. The interference on the reaction process is avoided.

The present invention discloses a method, system, device, medium, and program product for quantifying the progress of hydrogen absorption and desorption reactions, relating to the fields of materials science and image processing technology. The method comprises: preprocessing a reaction process image to obtain a feature image; extracting grayscale features or crack texture features related to the progress of the hydrogen absorption and desorption reactions based on the feature image; determining a reaction fraction based on the grayscale features or crack texture features, as well as the features of hydrogen absorption and desorption in equilibrium, thereby obtaining a quantified result of the progress of the hydrogen absorption and desorption reactions. Based on the different color and texture morphology of the hydrogen storage material before and after hydrogen absorption and desorption, the grayscale features and crack texture features in the reaction process image are extracted. By establishing a mapping relationship between the image features and the reaction progress, a quantified result is obtained based on the image features, thereby achieving real-time, in-situ, non-invasive monitoring of the reaction progress and avoiding interference with the reaction process.

The application belongs to the technical field of hydrogen storage and transportation, and discloses a magnesium-based hydrogen storage material hydrogen absorption and release system using air as a heat medium, which comprises a hydrogen storage heat exchange box, at least one hydrogen storage bottle which can be detachably installed in the hydrogen storage heat exchange box, an air circulation heating unit and an air circulation cooling unit; the air circulation heating unit comprises an air duct heater and a first air fan, and forms a heating circulation loop with the hydrogen storage heat exchange box; the air circulation cooling unit comprises an air duct cooler and a second air fan, and sends cooling air into the hydrogen storage heat exchange box. In the hydrogen absorption working condition, the hydrogen storage bottle is heated to a reaction temperature by the heating unit first, and then the cooling unit is switched to reduce the temperature after hydrogen absorption heat is released; in the hydrogen release working condition, only the heating unit is needed to heat to a decomposition temperature. The application significantly improves the hydrogen storage density of the magnesium-based hydrogen storage equipment, and reduces the equipment cost.

The application provides an A2B7 type Y-Mg-Ni hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage materials. 1‑a‑b Mg a C b Ni c D d , wherein 0.05<=a<=0.25, 0<=b<=0.2, 3.25<=c<=3.45, 0<=d<=0.2, C is at least one selected from Ce, Pr, Nd, Sm, Gd, and D is at least one selected from Mn, Mo, Fe, Ti, Si and W. The hydrogen storage alloy material is doped with elements and modified in process, so that the pure A2B7 type hydrogen storage material is obtained, the hydrogen storage capacity of the rare earth hydrogen storage alloy, the hydrogen absorption and release cycle stability and the hydrogen absorption and release plateau pressure can be improved simultaneously.

The invention relates to the field of urban hydrogen energy conversion, and discloses an air conditioning system adopting a solid hydrogen storage technology. The air conditioning system based on the solid-state hydrogen storage technology comprises a control subsystem, a hydrogen production and purification subsystem, a solid-state hydrogen storage heat exchange subsystem and a fuel cell subsystem, and the urban hydrogen energy conversion process is promoted by utilizing the high safety characteristics of low operation pressure and hydrogen absorption and heat release / hydrogen desorption and heat absorption of the solid-state hydrogen storage technology; and the characteristic of hydrogen absorption and heat release / hydrogen desorption and heat absorption is utilized to enter the air-conditioning field, so that the dependence of an air-conditioning technology on a compressor is eliminated, and simultaneous flowering of two racing tracks in one technology is realized.

The invention discloses an alloy hydrogen storage hydrogen absorption and desorption control method and system based on an agent model. The method comprises the steps that leakage detection of an alloy hydrogen storage system and activation of an adsorbent are conducted; setting a hydrogen absorption / desorption mass flow rate, taking the hydrogen absorption / desorption mass flow rate as a target value of a hydrogen absorption / desorption rate, and determining initial hydrogen pressure and temperature according to the proxy model; according to the real-time hydrogen pressure and temperature in the hydrogen storage reactor, the real-time adsorption / desorption rate is rapidly predicted; and the temperature of the hydrogen storage reactor is adjusted by adopting a PID control algorithm. The agent model based on data driving is obtained through training by adopting a small sample learning technology, and the problem of model training accuracy caused by insufficient data volume is solved. The model is small in scale and quick in response, and can be quickly deployed in a control algorithm, so that thermal environment parameter control is effectively implemented in an easy-to-implement temperature parameter control mode, and the stability of hydrogen absorption and desorption is improved.

Provided are a heating module, a heating device, and a gas introduction device capable of causing a heating element to generate heat with a simple structure and at low cost. A heating module 10 comprises: a hollow airtight container 16; a connection portion 17 detachably connected to an external device; a heating element 18 for generating heat through hydrogen absorption and release; and a heat source 19 for heating the heating element 18. The external device includes: a power supply device for supplying power to the heat source 19; and a gas introduction device for introducing, into a space 21 inside the airtight container 16, a sealed gas containing at least one of an inert gas and a hydrogen-based gas that contains hydrogen. The connection portion 17 includes: a power connector 26 connected to the heat source 19 and detachably connected to the power supply device; and a sealing valve 28 for opening and closing the space 21 and detachably connected to the gas introduction device. The sealing valve 28 is closed to close the space 21. In the closed space 21, the heating element 18 that has absorbed hydrogen is provided, and the sealed gas is enclosed.

The invention discloses a solid hydrogen storage device and a hydrogen storage method.The solid hydrogen storage device comprises a device rack, a plurality of hydrogen storage tanks are arranged in the device rack at equal intervals, each hydrogen storage tank is composed of a hydrogen storage barrel, a first flange and a second flange, and the hydrogen storage barrels are fixedly installed in the device rack; a first flange and a second flange are fixedly installed at the two ends of each hydrogen storage barrel respectively, the outer sleeves are coaxially and fixedly installed outside the hydrogen storage barrels, and interlayers exist between the inner walls of the outer sleeves and the outer walls of the hydrogen storage barrels; and a heat exchange assembly is installed in an interlayer between the interior of each outer sleeve and the hydrogen storage barrel, a temperature control assembly is installed on the device rack, and a communication assembly is installed on the device rack, so that the problem that in the prior art, due to the fact that the heat exchange efficiency is limited, heat generated in the hydrogen absorption process is difficult to transfer away rapidly, and the hydrogen storage capacity is affected is solved.

This invention relates to a Ti-Fe-Ce-Mn-Zr-Al-Co based hydrogen storage alloy and its preparation method, belonging to the technical field of hydrogen storage alloy materials. It solves at least one of the problems of high activation conditions, long activation cycles, and poor hydrogen absorption / desorption performance in existing TiFe hydrogen storage alloys. This invention provides a Ti-Fe-Ce-Mn-Zr-Al-Co based hydrogen storage alloy, characterized in that: the alloy's specific composition is Ti... 1.05 Ce 0.05 Fe 1.15‑x‑y‑z‑m Mn x Zr y Al z Co m Where x, y, z, and m are atomic ratios, and 0.1≤x≤0.25, 0.05≤y≤0.2, 0.02≤z≤0.1, 0.02≤m≤0.1. The hydrogen storage alloy exhibits excellent activation and hydrogen absorption / desorption properties, with a hydrogen storage capacity ≥1.70 wt.%, a hydrogen absorption plateau pressure ≥0.41 MPa, and a hydrogen desorption plateau pressure ≥0.31 MPa. It can be activated in a single step at 30°C and an initial hydrogen pressure of 3 MPa, making it suitable for widespread application as a solid-state hydrogen storage material in hydrogen fuel cells and other scenarios.

To provide a piezoelectric element that is easy to use, and a liquid dispensing head that includes such piezoelectric element. [Solution] The piezoelectric element is a piezoelectric element in which a lower electrode, a piezoelectric layer made of a perovskite-type composite oxide, and an upper electrode are stacked in the stacking direction, and a first hydrogen absorption layer that absorbs hydrogen is located above or below the lower electrode in the stacking direction. Preferably, the first hydrogen absorption layer is provided between the lower electrode and the piezoelectric layer in the stacking direction.

The invention provides a preparation method of a high-pressure hydrogen isotope gas source based on a hydrogen absorption material, which has the advantages of high safety, simple and reliable high-pressure obtaining mode, controllable and repeatable pressure, high gas utilization rate and less waste. The reversible hydrogen absorption material is placed in a closed container, the volume of an inner cavity of the closed container is larger than that of the reversible hydrogen absorption material, then the reversible hydrogen absorption material placed in the closed container adsorbs hydrogen isotope gas, and when the hydrogen isotope gas is needed, the reversible hydrogen absorption material is desorbed; and the released hydrogen isotope gas generates positive pressure in the fixed volume of the closed container, so that a high-pressure hydrogen isotope gas source is formed.

The invention relates to an AB2 type hydrogen storage alloy and a preparation method and application thereof, the preparation method comprises the following steps: (1) performing first mixing on Cr and Mn according to the proportion of each element to obtain a first mixed metal material, and performing second mixing on Ti and Zr to obtain a second mixed metal material; and (2) carrying out first smelting treatment on the first mixed metal material until the first mixed metal material is partially or completely smelted, then adding the second mixed metal material into the first mixed metal material, carrying out second smelting treatment until the fusible components are completely smelted, and then sequentially carrying out refining treatment and cooling treatment to obtain the flaky alloy. According to the method, secondary feeding and rapid hardening smelting are combined, the AB2 type hydrogen storage alloy which is small in hydrogen absorption and desorption PCT curve slope and still can keep high hydrogen storage capacity after 100 times of hydrogen absorption and desorption circulation is prepared, and the service life of a smelting crucible is prolonged.