118 results about "Alkaline water electrolysis" patented technology

The invention discloses supported nickel-iron composite hydroxide oxygen evolution electrode for alkaline water electrolysis and a preparation method for the supported nickel-iron composite hydroxide oxygen evolution electrode. The preparation method comprises the following steps: performing easy physical mixing-rolling on nickel and iron salt solutions, a conductive carrier and a binder to directly obtain a metal salt/carbon film; and performing low-temperature thermal treatment, in-situ precipitation and metal current collector pressing to obtain the supported nickel-iron composite hydroxide oxygen evolution electrode. Through the in-situ precipitation reaction of a metal salt pre-absorbed in the carrier, the dimension of a nickel-iron composite hydroxide catalyst is controlled, and an active site is improved; and secondly, through the in-situ precipitation reaction process, negative ions of a nitrate radical, a sulfate radical and the like are easily inserted into a nickel-iron composite hydroxide lattice, so that the oxygen evolution activity of the electrode is further regulated; moreover, the resistance loss is reduced through an internal structure constructed by the conductive carrier with a high specific surface area. The preparation method for an electrode material has the advantages of being simple, gentle in condition and high in raw material utilization rate, so that the good industrial prospect and a high economic value are shown.

The invention provides a cathode for hydrogen production by alkaline water electrolysis or a cathode for chlor-alkali industry and a preparation method thereof. The method is characterized by using a three-dimensional nickel net as a matrix, conducting electrochemical deposition by controlling electrodeposition potential and the concentration of Ni and Mo in the electrolyte to form a Ni-Mo alloy coating to gradually reduce the concentration of Ni near the side of the matrix in the coating and gradually increase the concentration of Mo near the side of the matrix in the coating; and then, conducting anodic etching in an ammonia solution, wherein because the dissolution and solution of Ni are generated in the coating and the matrix and Mo is kept, the electrode specific surface is increased, and hydrogen evolution over potential is reduced. According to the gradient deposition and anodic etching method of the invention, the catalyst coating and Ni matrix form integrated alloy, delamination and detachment between the catalyst and the matrix can be prevented, and simultaneously good hydrogen evolution performance is achieved.

A bipolar alkaline water electrolysis unit incorporated in an electrolytic cell for electrolyzing an electrolytic solution of alkaline water to obtain oxygen and hydrogen, the bipolar alkaline water electrolysis unit including an oxygen generating anode, a hydrogen generating cathode, a conductive partition wall that separates the anode and the cathode from each other, and an outer frame that surrounds the conductive partition wall, wherein a gas and electrolytic solution passage is provided at an upper portion of the conductive partition wall and/or the outer frame, and an electrolytic solution passage is provided at a lower part of the conductive partition wall and/or the outer frame.

The invention discloses a high-efficiency porous Ni-Mo hydrogen evolution electrode and a preparation method thereof. The preparation method of the high-efficiency porous Ni-Mo hydrogen evolution electrode comprises the steps that firstly, an oxide layer and grease substances on the surface of a nickel net or foamed nickel are removed through mechanical shearing, degreasing (alkali-washing degreasing or electrolytic degreasing), and acid pickling; secondly, Ni particles, Mo particles and Al particles are evenly mixed according to a certain proportion and then sprayed onto a pretreated conductive substrate in a plasma spraying way; thirdly, a sprayed electrode is subjected to alkali washing, so that active Al metal is removed; and finally, the electrode treated with alkali liquor is placed in a tubular furnace for high-temperature thermal reduction. According to the electrode, molybdenum nanoparticles are used as a molybdenum element source to be evenly doped into a catalyst layer, so that a plating structure which is excellent in hydrogen evolution capacity, provided with the uniform catalyst layer and high in hydrogen evolution activity is formed. The active Al metal is removed through alkali washing, so that a porous structure is formed on the surface of the electrode, a reaction active site is enlarged, and the hydrogen evolution activity is improved. According to the preparation method of the high-efficiency porous Ni-Mo hydrogen evolution electrode, operation is simple, the production cost is low, and the catalyst layer is firm in structure. The hydrogen evolution catalytic active electrode prepared through the method can be widely applied to the alkaline water electrolysis industry.

The invention discloses an efficient Ni-S-Mo hydrogen evolution electrode and a preparation method thereof. The method comprises the steps of removing oxidation layers and grease substances on the surface of a nickel sheet or foamed nickel through mechanical grinding, degreasing of an alkali wash mode or an electrolytic mode and acid pickling; depositing Ni, S and Mo on a pretreated conductive base body in an electro-deposition mode. Nanometer molybdenum particles serving as molybdenum sources are uniformly mixed into a clad layer for forming a clad layer structure with the excellent hydrogen evolution ability, the uniform clad layer and the high hydrogen evolution activity. The method has the advantages that the operation is simple, the production cost is low and the structure of the clad layer is firm. The hydrogen evolution catalytic active electrode prepared through the method can be widely used in the alkaline water electrolysis industry.

A diaphragm for alkaline water electrolysis according to the present invention is provided with a polymeric porous membrane including a polymeric resin and hydrophilic inorganic particles. The porosity of the polymeric porous membrane is at least 30%, but not more than 60%. The average pore size of both surfaces of the polymeric porous membrane is at least 0.5 mu m, but not more than 2.0 mu m. The ratio (mode particle size/average pore size) of the mode particle size of the hydrophilic inorganic particles to the average pore size of the polymeric porous membrane is at least 2.0.

Methods of forming electrodes for electrolysis of water and other electrochemical techniques are provided. In some embodiments, the electrode comprising a current collector and a catalytic material. The method of forming the electrode may comprising immersing a current collector comprising a metallic species in an oxidation state of zero in a solution comprising anionic species, and causing a catalytic material to form on the current collector by application of a voltage to the current collector, wherein the catalytic material comprises metallic species in an oxidation state greater than zero and the anionic species.

An alkaline water electrolysis diaphragm includes: a polymer porous layer containing at least one polymer compound selected from polyether sulfone having a contact angle of 20 to 90° and polysulfone having the contact angle of 20 to 90°; and an organic fiber fabric layer coupled to the polymer porous layer. The polyether sulfone having the contact angle of 20 to 90° is at least one polymer compound selected from the group made of polyether sulfone, hydrophilic polyether sulfone, cationic polyether sulfone, and cationic hydrophilic polyether sulfone. The polysulfone having the contact angle of 20 to 90° is at least one polymer compound selected from the group made of polysulfone, hydrophilic polysulfone, cationic polysulfone, and cationic hydrophilic polysulfone.

An anode for alkaline water electrolysis includes a conductive substrate having at least a surface made of nickel or a nickel-base alloy and a lithium-containing nickel oxide catalytic layer formed on a surface of the substrate. The molar ratio (Li/Ni) of lithium and nickel in the catalytic layer is in the range of 0.005 to 0.15.

The invention belongs to the technical field of water electrolysis anode material research, and especially relates to a two-step oxidation synthesized water electrolysis anode and a preparation methodthereof. The preparation method comprises following steps: firstly, an oxide layer and grease substances on the surface of a nickel-based metal are removed through mechanical shearing, oil removal (acetone washing and ethanol washing) and acid pickling; immersing the cleaned electrode material into a prepared acidic solution containing an oxidizing agent for oxidation to obtain a nickel oxidationstate substance layer electrode; oxidizing a nickel-based surface layer substance into an oxide or a hydroxide of nickel; then, carrying out second-step oxidation in an electrolyte containing ferrousions by adopting an electrochemical anodic oxidation method so as to introducing iron element in changing nickel valence state and forming a nickel-iron oxide or hydroxide electrode. The anode catalytic active electrode prepared by adopting the method is low in overpotential, capable of effectively reducing water electrolysis energy consumption, simple in process, relatively low in cost and capable of being widely applied to the alkaline water electrolysis industry.

The invention relates to a combined diaphragm regulating valve device, an alkaline water electrolysis hydrogen production system and a control method. The combined diaphragm regulating valve device comprises a plurality of diaphragm regulating valve branches with different gas flow ranges and flow distributors used for distributing flow of the branches, the diaphragm regulating valve branches arearranged in parallel, the flow distributors are connected with the diaphragm regulating valve branches respectively, and in the working process, at least one diaphragm regulating valve branch works. The alkaline water electrolysis hydrogen production system comprises an alkaline water electrolysis hydrogen production device, an alkali liquor circulating device and two combined diaphragm regulatingvalve devices. The alkaline water electrolysis hydrogen production device comprises an electrolytic cell, an oxygen side gas-liquid separator and a hydrogen side gas-liquid separator. The alkali liquor circulating device is connected with the alkaline water electrolysis hydrogen production device, and the combined diaphragm regulating valve devices are respectively arranged at the gas output endsof the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator. Compared with the prior art, the safety of the alkaline water electrolysis hydrogen production system under different working power ranges is ensured.

The invention relates to a Co-O efficient compound hydrogen evolution electrode covering Co-Mo-O and a preparation method thereof. The preparation method comprises the following steps of: firstly, pre-treating a conductive substrate; and then growing cobalt and molybdenum oxides with multi-grade compound structures on the pre-treated conductive substrate by means of a hydrothermal method. As a result of a synergistic effect of the multi-stage nano structure, the electrode material has more reaction active sites and smaller electron transfer resistance. The formed electrode material has an excellent hydrogen evolution property, and is kept stably within an electrolysis time longer than 50h. The method provided by the invention is simple to operate and low in production cost, and the compound hydrogen electrode prepared by the method can be widely applied to alkaline water electrolytic industry.

The invention discloses a water electrolysis produced gas pressure self-balancing device and an application thereof, and relates to the field of gas pressure self-balancing devices. The device comprises an electrolysis unit, the electrolysis unit comprises a first cathode, a common anode and a second cathode; the common anode is arranged between the first cathode and the second cathode, two side faces of the common anode are opposite to the first cathode and the second cathode respectively, the first cathode and the second cathode are connected in parallel and used for being connected with a negative electrode of an external power supply respectively, and the common anode is used for being connected with a positive electrode of the external power supply. An electrolysis unit without pressure difference can be formed; a special pressure balance part or system does not need to be additionally arranged; the complexity of an electrolysis system is effectively reduced, the cost is reduced,popularization and application of a water electrolysis hydrogen production and oxygen production technology are facilitated, particularly application to alkaline water electrolysis hydrogen productionand oxygen production can be achieved easily, water hydrolysis under a high pressure can be realized easily, the gas production pressure can also be remarkably improved, and the gas production efficiency is greatly improved.

The invention discloses an alkaline solution hydrogen evolution electrocatalyst NiVRu ternary alloy as well as a preparation method and an application thereof, the alkaline solution hydrogen evolutionelectrocatalyst NiVRu ternary alloy comprises the main component of Ni, the mass percentage content of V element is 1-15%, the mass percentage content of Ru element is 1-15%, and the mass percentagecontent of Ni element is 70-90%. The alkaline solution hydrogen evolution electrocatalyst NiVRu ternary alloy obtained through the preparation method serves as an electrode material, has good alkalinehydrogen evolution performance and low precious metal ruthenium content, the ruthenium content can be as low as 1%, and meanwhile the alkaline solution hydrogen evolution electrocatalyst NiVRu ternary alloy shows excellent electrochemical stability and shows good alkaline water electrolysis hydrogen evolution catalytic performance. The preparation method is simple, environmentally friendly, low in cost and suitable for industrial large-scale production.

Disclosed herein is functional conducting carbon cloth with permeability and turbostratic disorder, and process for preparation of the same. Further it describes use of said carbon cloth as anode in alkaline water electrolysis for generation of hydrogen at sub-threshold potential (<1.23V) and generation of carbon quantum dots (CQDs) at super-threshold potential (>1.23V). The invention also relates to the efficient use of the said carbon cloth as counter electrode in Dye Sensitized Solar Cells (DSSCs).

The invention discloses an efficient iron-cobalt layered double-hydroxide coupled nickel-molybdenum hydroxide hydrogen evolution electrode and a preparation method thereof. The preparation method comprises the steps that: a conductive substrate is pretreated; a nickel-molybdenum hydroxide grows on the pretreated conductive substrate through a chloride ion corrosion method; and a FeCoLDH layer grows in situ through hydrothermal synthesis. The electrode is of a nano structure, can provide larger reaction active sites and smaller electron transfer resistance; the formed electrode material has excellent hydrogen evolution performance and keeps stable within the electrolysis time of more than 10 hours. The method is simple to operate and low in production cost. The hydrogen evolution catalyticactive electrode prepared by the method can be widely applied to the alkaline water electrolysis industry.

The invention relates to an efficient and porous MoS2-Zn hydrogen evolution electrode. According to the electrode, nanometer-scale molybdenum disulfide particles are adopted as a source of molybdenum, the composite electro-deposition mode is adopted, the nanometer-scale molybdenum disulfide particles, Ni and Zn are all deposited to the surface layer of a conductive substrate, potassium hydroxide solution water-bath constant-temperature treatment is carried out after electro-deposition is completed, and finally the efficient and porous MoS2-Zn hydrogen evolution electrode is prepared. The invention further relates to a preparation method of the efficient and porous MoS2-Zn hydrogen evolution electrode. The method includes the steps of 1, pre-treating the conductive substrate; 2, carrying out composite electro-deposition on the nanometer-scale molybdenum disulfide particles; and 3, carrying out constant-temperature water-bath treatment on the electrode subjected to composite electro-deposition in a constant-temperature water-bath kettle through alkaline liquor for removing Zn. The method has the advantages that the operation is simple, the production cost is low and the structure of a catalyst layer is firm, and the catalytic active hydrogen evolution electrode prepared through the method can be widely applied to the alkaline water electrolysis industry.

An assembly of a porous gas-evolving electrode and a porous separator diaphragm, suitable for use in a water electrolyser operating with an alkaline electrolyte is disclosed. A water electrolyser having the gas-evolving electrode component of the assembly arranged as the cathode allows manufacturing hydrogen with a purity exceeding 99.8%.

The invention discloses an alkaline water electrolysis hydrogen production waste heat utilization system and method. The system comprises an electrolysis system used for electrolyzing water to generate to-be-treated hydrogen and to-be-treated oxygen; the hydrogen treatment system is used for treating the hydrogen to be treated to obtain hydrogen to be purified, wherein the hydrogen to be purifiedcontains trace oxygen; the oxygen treatment system is used for treating the oxygen to be treated to obtain clean oxygen; the circulation control pipeline is used for controlling the transmission of alkali liquor separated by the electrolysis system; the deoxidation system is used for reacting trace oxygen in the hydrogen to be purified with trace hydrogen to obtain pure hydrogen and water; the waste heat recovery system is used for connecting the circulation control pipeline and the deoxidation system so as to provide waste heat of the alkali liquor conveyed by the circulation control pipelineinto the deoxidation system. Waste heat of alkali liquor after the electrolysis system is utilized to the deoxidation system through the waste heat recovery system to be heated to remove trace oxygenin hydrogen to be purified, extra heating electric energy of the deoxidation system and matched equipment of the deoxidation system are saved, and hydrogen deoxidation is simple.

The invention relates to an Ni-S high-efficient hydrogen evolution electrode loaded with Co-OH and a preparation method thereof. The preparation method comprises the following steps: preprocessing a conductive substrate; then automatically growing an Ni-S nano-sheet middle layer on the preprocessed conductive substrate through a hydrothermal method; then performing electro-deposition on Co-OH nano-particles on the Ni-S nano-sheet middle layer. Because of a synergistic effect of a multi-stage nano-structure, re-distribution of electric charge is produced on two material interfaces, so that morereaction activity sites and smaller electron transfer resistance are obtained, and the formed electrode material has excellent hydrogen evolution performance and keeps stable in the electrolysis times exceeding 48 hours. The method disclosed by the invention has the advantages of simple operation and low production cost. The electrode with hydrogen evolution catalytic activity prepared with by adopting the method can be widely applied to alkaline water electrolysis industries.

The invention relates to a novel optical electrolytic bath structure and particularly relates to a device for decomposing water into hydrogen and oxygen in an alkaline solution by virtue of the excitation action of light at a theoretical decomposition voltage lower than that of the water. The device is improved on the basis of a conventional alkaline water electrolytic bath, a membrane electrode structure is applied to the inside, zero distance between an electrode and a membrane electrode is ensured effectively, electrolytic efficiency is improved and energy consumption is lowered, and furthermore, the device has favorable stability.

The invention relates to an anion exchange membrane containing an arylene piperidine and diketone monomer copolymer as well as a preparation method and application of the anion exchange membrane, andbelongs to the technical field of alkaline water electrolyzers. The invention provides a copolymer containing arylene piperidine and diketone monomer, a main chain of the copolymer is composed of a high-molecular-weight ether-bond-free, rigid and hydrophobic aryl skeleton, piperidine cations with high alkali stability are combined, and a high-molecular-weight polymer with adjustable IEC can be prepared by copolymerization of a high-reactivity monomer diketone and the copolymer. Meanwhile, the high alkalinity of piperidine cations is retained. The obtained anion exchange membrane containing thearylene piperidine and diketone monomer copolymer has excellent chemical stability, film-forming property, conductivity and mechanical strength.