35 results about "Maximum power density" patented technology

The invention belongs to the technical field of microbial fuel cells, and particularly relates to a microbial fuel cell, a carbon-based anode and a preparation method of the carbon-based anode. Preparing a polyaniline / dopamine modifier from an aniline monomer and dopamine hydrochloride, and modifying the polyaniline / dopamine modifier on a carbon felt electrode to form a PANI-DA / CF anode; the preparation method comprises the following steps: preparing flower-like Fe2O3 nanoparticles by adopting a hydrothermal method, and electrochemically depositing the flower-like Fe2O3 nanoparticles on a PANI-DA / CF electrode to prepare a Fe2O3 / PANI-DA / CF anode; according to the microbial fuel cell disclosed by the invention, the maximum power density of the phenol wastewater anolyte reaches 4594 + / -97 mW / m < 2 > and is improved by 83.1% compared with that of a carbon felt anode MFC (Microbial Fuel Cell); after operation for 96 hours, the phenol degradation rate reaches 99.4%; and the electricity generation performance is still kept stable after three months of operation. The Fe2O3 / PANI-DA / CF anode provided by the invention improves the power density output of the microbial fuel cell and the wastewater treatment efficiency.

The invention discloses a nitrogen / boron-doped non-noble metal-based material, a synthesis method thereof and application of the nitrogen / boron-doped non-noble metal-based material in a microbial fuel cell. According to the method, a carbon fiber brush is used as a substrate, urea and sodium borohydride are used as a nitrogen source and a carbon source respectively, and the nitrogen / boron doped non-noble metal-based material is synthesized through a hydrothermal method. The electrostatic interaction between graphene oxide and FeCoNi-LDH is utilized to realize tight combination, so that FeCoNi-LDH nanosheets are uniformly dispersed on the surface of the carbon fiber brush, and the problems that LDHs are easy to agglomerate and poor in conductivity are solved; in the boron / nitrogen co-doping process, an efficient electron transmission channel is constructed by adjusting the electronic structure of the composite material, and the material is endowed with excellent electron transmission capability and oxygen reduction performance. In an MFC (Microbial Fuel Cell) test constructed by taking a nitrogen / boron-doped non-noble metal-based material as a cathode, the output voltage and the maximum power density are several times of those of commercial Pt / C and a blank carbon fiber brush, and the carbon fiber brush has a wide application prospect in the field of microbial fuel cells.

This invention relates to a medium-temperature solid oxide fuel cell cathode material and its preparation method. The invention employs a sol-gel method to synthesize perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The material contains PrBaCo2O with a double perovskite structure. 5+δ BaCo with single perovskite structure 0.8 Zr 0.1 Y 0.1 O 3‑δ Two phases. Multiphase Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The sample achieved a conductivity of 100 S / cm within the operating temperature range of a mid-temperature solid oxide fuel cell. ‑1 At 700℃, the polarization impedance is 0.06 Ωcm. 2 This meets the requirements for cathode materials in solid oxide fuel cells. The electrolyte-supported single cell achieved a maximum power density of 710 mW / cm³ at 800℃. ‑2 The single cell underwent continuous and stable discharge at a constant current for 200 hours without performance degradation, demonstrating excellent output performance stability. In summary, perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ It is a potential cathode material for intermediate-temperature solid oxide fuel cells.

The utility model provides a kind of high-power thick film heating device for new energy vehicle, including thick film heating plate, the upper surface of thick film heating plate is equipped with ceramic dielectric surface layer, the lower surface of thick film heating plate is equipped with metal base plate face, the upper of thick film heating plate is equipped with upper flow channel cavity mechanism, and lower is equipped with lower flow channel cavity mechanism;The utility model is by using single-layer thick film heating plate, and cooperate upper flow channel cavity mechanism and lower flow channel cavity mechanism to carry out up and down parallel flow guiding to heat conducting medium, so as to utilize heat conducting medium to synchronously absorb the heat of the upper and lower two sides of thick film heating plate, so as to reach double-sided heat exchange effect, to improve thick film heating device heat exchange coefficient and heat exchange area, to break through the maximum power density limit that thick film heating plate can use on traditional design, make thick film heating device realize higher electric power output under the same area, and simultaneously due to the improvement of heat exchange capacity, the thermal conversion efficiency of its product is also improved.

The present invention provides a conductive hydrogel and its derivatives, carbon nanomaterials, and enzyme bioelectrodes and their applications. The designed and synthesized conductive hydrogel and its derivatives can serve as electrolytes for flexible / rechargeable enzyme biofuel cells, ensuring ion conduction between the enzyme bioanode and enzyme biocathode while also serving as a fuel tank. Furthermore, the use of the hydrogel simplifies and facilitates the assembly of the biofuel cell, allowing the enzyme bioanode and enzyme biocathode to be directly pressed onto the sides of the hydrogel electrolyte plate, thereby eliminating the cumbersome battery assembly and packaging issues. The present invention uses a catalyst to activate asphalt to produce RADC and enzyme bioelectrodes prepared using RADC. The biofuel cell / capacitor hybrid biodevice assembled based on the conductive hydrogel electrolyte and enzyme bioelectrode outputs up to 0.64V OCP and 1.01μW·cm ‑2 It has the maximum power density and has high stability, excellent self-healing, ductility, adhesion, puncture resistance and plasticity.

This application provides a sheet-like spinel cobalt ferrite, its preparation method, and its application, belonging to the field of solid oxide battery technology. In this application, a Co source and an Fe source are dissolved in deionized water, citric acid is added and stirred until homogeneous, then heated in a water bath until the solution becomes a reddish-brown transparent gel. The gel is then dried and ground to obtain a first powder. The first powder is then subjected to two CO2 laser-induced oxidation processes in air at a laser power of x to obtain a second powder. Wherein, 4W < x ≤ 10W. Finally, the second powder is washed and dried to obtain a sheet-like spinel cobalt ferrite. Compared with ordinary spinel cobalt ferrite, using the aforementioned sheet-like spinel cobalt ferrite as a cathode material in SOFC can reduce the polarization impedance of the battery by 0.023 Ωcm. 2 The maximum power density increased by 0.38 W / cm². ‑2 This improves the oxygen reduction activity and stability of SOFCs. Furthermore, using CO2 laser-induced methods simplifies the preparation process, reduces time costs, and increases production efficiency.

This invention belongs to the field of catalyst technology, specifically relating to a polyoxometalate-anchored cobalt single-atom catalyst, its preparation method, and its application. The invention uses a polyoxometalate as the anchoring substrate and electronic control unit. First, a cobalt-substituted polyoxometalate precursor is prepared via a coordination reaction, then composited with a ZIF-derived conductive carbon substrate, and finally reduced with hydrogen to obtain the target catalyst. This catalyst effectively inhibits cobalt single-atom aggregation, achieving a cobalt single-atom loading of 3.55 wt%. Under alkaline conditions, it exhibits excellent oxygen reduction catalytic activity, stability, and methanol resistance, with a half-wave potential of 0.826 V. When used in a zinc-air battery, it achieves an open-circuit voltage of 1.48 V and a flow rate of 239.6 mW / cm². 2 With maximum power density and excellent cycle stability, it can replace commercial platinum-carbon catalysts.

The application discloses a carbon dioxide capturing method, a capturing system and application thereof. The method comprises the following steps: mixing potassium carbonate solution and carbon dioxide gas to obtain a suspension, filtering the suspension to obtain a filtrate; after the battery device is powered on, the filtrate is introduced into a cathode area of the battery device, and carbon dioxide gas is introduced into the cathode area; after the solution in the cathode area is heated and the carbon dioxide is separated, the solution is introduced into an anode area of the battery device. The carbon dioxide capturing method provided by the application can generate electric energy while capturing carbon dioxide by using a battery device, carbon dioxide gas is introduced into the cathode area of the battery device to capture the carbon dioxide, after power on, K2CO3 is used as a reaction raw material of the anode area, the output power of the battery and the conversion rate of CO2 are high, the maximum power density can reach 50 W / m 2 , and the CO2 conversion rate can reach more than 24%.

The present application relates to a kind of boron ruthenium co-doped cobalt three oxide catalytic material and its preparation method and application, by hydrothermal, pyrolysis, etching three-step method preparation synthesis out with superfine nanoparticle B-Ru-Co3O4 Catalytic material, in alkaline total water splitting condition 10mA cm ‑2 Potential is 1.49V, simulate seawater total water splitting condition 10mA cm ‑2 Potential is 1.54V, using 3.5wt% NaCl as magnesium / seawater battery electrolyte, its maximum power density is 15mW cm ‑2 , and at 2mW cm ‑2 Power density under stable discharge 24h without attenuation.The synthesis method is simple and efficient, while realizing low noble metal loading rate, show higher than commercial noble metal catalyst performance, has broad application prospect.

The invention provides a cathode material and a preparation method and application thereof. The cathode material disclosed by the invention comprises the perovskite type ferrite core and the CeO2 nanoparticles covering at least part of the surface of the core, so that the cathode material has relatively high oxygen reduction catalytic activity; the Ca element is used for replacing the Sr element, the defect that the Sr element is prone to segregation in the high-temperature and long-term operation process can be overcome, the problem that the Sr element reacts with electrolyte to generate a high-resistance third phase is thoroughly solved, and the tolerance of the cathode material to CO2 in feed gas is further enhanced. The chemical formula of the cathode material is LaaCa (0.4-x) CexCobFecO (3-delta), element selection of the cathode material is limited, and the proportion of each element is limited in a specific range, so that the cathode material has relatively high oxygen reduction catalytic activity and long-term running structural stability, the electrochemical performance of the battery is enhanced, the overall impedance of the battery can be reduced, and the service life of the battery is prolonged. And the maximum power density of the battery is improved.

The invention discloses a Fe-N-C-at-MXene composite material, a synthesis method thereof and an application of the Fe-N-C-at-MXene composite material in a microbial fuel cell. According to the method, an in-situ growth strategy is adopted, MIL-101 (Fe) is constructed on the surface of single-layer Ti < 3 > C < 2 > T < x > MXene, an MIL-101 (Fe)-MXene composite material with good interface bonding is formed, melamine is introduced as a nitrogen source, synergistic nitrogen doping and carbonization are achieved through high-temperature pyrolysis, and the Fe-N-C-MXene composite material with the high specific surface area and rich active sites is constructed. The Fe-N-C-at-MXene composite material disclosed by the invention not only has excellent conductivity and structural stability, but also has a hierarchical pore channel and a high-density electrocatalytic active center, so that oxygen diffusion and interface reaction kinetics are effectively promoted. In an MFC performance test, as a cathode catalyst, the cathode catalyst remarkably improves the output voltage and the maximum power density of the battery, exceeds a commercial Pt / C catalyst, and shows a wide application prospect.

The application provides a method for removing uranium and organic matters in water body and generating electricity simultaneously, and particularly relates to the field of resourceful treatment of wastewater. The method comprises the following steps: placing an electrolyte solution containing a source of hexavalent uranium and organic matters in a photoelectrocatalytic reaction tank for light irradiation; the photoelectrocatalytic reaction tank uses tin sulfide nanosheet / carbon felt as a cathode, and uses titanium dioxide nanomaterial and a photovoltaic cell as a composite anode. The application utilizes the light anode to generate electron-hole pairs under light excitation, and the post-positioned photovoltaic cell generates a bias voltage under light excitation to drive the photo-generated electrons to transfer to the cathode and generate electricity, while improving the separation efficiency of the electrons and the holes. The soluble and easily migratory hexavalent uranium is quickly enriched by the tin sulfide nanosheet / carbon felt and is reduced to the non-migratory tetravalent uranium precipitate on the surface of the tin sulfide nanosheet / carbon felt by the photo-generated electrons and low-valence S. According to the test results, the highest removal rate of the method provided by the application to the organic matters and the uranium can reach more than 97%, and the maximum power density is 2.01 mW·cm ‑2 .

This invention discloses an SOFC fuel electrode, its preparation method, and its application, belonging to the field of fuel electrode technology. The SOFC fuel electrode of this invention has a three-layer structure, including a first layer, a second layer, and a third layer. By increasing the proportion of plate-like NiO in the second layer, the contact area between the electrode and the reacting gas can be increased, thereby improving the reaction rate. By increasing the proportion of particulate NiO in the first and third layers, the gas diffusion rate can be improved. The SOFC fuel electrode prepared using the method described in this invention exhibits good stability, durability, fuel utilization rate, and maximum power density.

The invention relates to a preparation method and application of an iron / antimony diatom-nitrogen-carbon (Fe / Sb-N-C) composite material. The composite electrode is prepared according to the following steps: a, stirring at room temperature to synthesize a zeolite imidazole organic framework precursor (ZIF-8); b, preparing nitrogen-doped carbon through an annealing method; c, preparing a Fe / Sb-N-C precursor through solution dipping; and d, the Fe / Sb-N-C composite material is prepared through an annealing method. Fe / Sb-N-C shows excellent oxygen reduction reaction (ORR) catalytic performance, the half-wave potential is 0.92 V, the Tafel slope is 46.3 mV dec-1, and the performance is superior to that of commercial Pt / C. Besides, the zinc-air battery constructed by taking Fe / Sb-N-C as the air cathode can reach the maximum power density of 196mW cm <-2 > and the specific discharge capacity of 795mAh g <-1 >, can stably circulate for 1000 circles, and shows good practical application value. The preparation method can also be expanded to design of other diatomic composite materials, and a new idea is provided for development of efficient electrocatalysts.

This invention provides a one-dimensional surface-shared oxide air electrode material, its preparation method, and its application, belonging to the technical field of air electrode materials. The novel one-dimensional surface-shared oxide air electrode material provided by this invention, which is non-stoichiometric, is A5B5O. 14 Type oxide, with the chemical formula Ba 5‑x Co 2.85 Fe 1.9 Ni 0.25 O 14‑δ Where 0 ≤ x ≤ 0.8. This invention modulates the oxygen vacancy concentration by changing the stoichiometric ratio of Ba at the A-site of the oxide, thereby improving its electrochemical performance in proton-conducting ceramic batteries. In Example 3 of this invention, Ba with x = 0.5... 4.5 Co 2.85 Fe 1.9 Ni 0.25 O 14‑δ When applied to proton-conducting ceramic batteries, it exhibits the highest measured electrochemical performance; at 700℃, in fuel cell mode, the measured polarization impedance is only 0.041 Ω·cm. 2 Its maximum power density reaches 2.101 W·cm³. ‑2 In electrolytic cell mode, after introducing humid air to the air electrode side, the current density reached 5.080 A·cm⁻¹ at an electrolytic voltage of 1.3V. ‑2 .

The invention discloses a phosphorylated polyborosiloxane proton exchange membrane and application thereof, and belongs to the field of proton exchange membranes. The preparation method comprises the following steps: firstly preparing phosphorylated polyborosiloxane, grafting a phosphonic acid group to a polysiloxane main chain to ensure the stability of a proton carrier, and then blending with chitosan to form a hydrogen bond with phosphonic acid in the phosphorylated polyborosiloxane and unreacted free phosphoric acid. Compared with a method of doping or utilizing a metal organic framework for stabilization, the method provided by the invention fundamentally solves the problem that phosphoric acid is easy to lose by utilizing chemical bonds to graft phosphoric acid from the structure. Experimental results show that the phosphorylated polyborosiloxane proton exchange membrane provided by the invention has excellent thermal stability, the mass loss at 200 DEG C is lower than 10%, the high-temperature proton conductivity can reach 40-100 mS / cm, a single cell test shows that the open-circuit voltage is 0.2-1.0 V, the maximum power density reaches 200-800 mW / cm, and the phosphorylated polyborosiloxane proton exchange membrane shows good high-temperature low-humidity application performance.

The invention discloses a novel bacterium with an electrogenesis function and application thereof, and belongs to the technical field of microbial technology and biological energy. According to the invention, a novel strain with stable electricity generation capability is screened from papermaking wastewater in the final discharge phase of a microbial fuel cell (MFC). The homology between the 16s rRNA gene sequence of the bacterial strain and the known bacterial strain of Cupriavidus pauculus is the highest. The Cupriavidus pauculus PMWA1-3 strain is determined to be a new strain of Cupriavidus in combination with a phylogenetic tree construction result, and the new strain is named as Cupriavidus pauculus PMWA1-3. The bacterial strain can grow by taking a phenol organic pollutant catechol as a unique carbon source, and when the bacterial strain is used for constructing an MFC (Microbial Fuel Cell), the highest power generation voltage is 291.7 mV, and the maximum power density reaches 202.2 mW / m, which indicates that the bacterial strain has strong power generation capability.

The application discloses a novel bacterium with electricity generation function and application thereof, and belongs to the technical field of microorganisms and bioenergy. A novel bacterium with stable electricity generation capacity is screened in papermaking wastewater at the end of discharging of a microbial fuel cell (MFC). Cupriavidus pauculus The 16s rRNA gene sequence of the bacterium is most homologous to known strains. Combining with the construction result of a phylogenetic tree, it is determined that the bacterium is a novel strain of the genus Cupriavidus, and is named PMWA1-3. Cupriavidus pauculus The bacterium can grow by taking phenolic organic pollutants, namely catechol, as the only carbon source, a MFC is constructed by using the bacterium, the highest electricity generation voltage is 291.7 mV, and the maximum power density reaches 202.2 mW / m2, which indicates that the bacterium has strong electricity generation capacity.

The application is suitable for the technical field of parameter optimization, and provides an optimization method for maximizing power density of a proton exchange membrane fuel cell, comprising the following steps: optimization variable and optimization target selection; adopting an AdaBoost integrated neural network model as a proxy model for calculating fitness function values in an iteration process of a swarm intelligence optimization algorithm; selecting an improved grey wolf optimizer (IGWO) as an optimization tool for iteration optimization in a value range of the optimization variable, with the maximum power density as the target, to obtain an optimal optimization variable combination; and optimization result verification.The application proposes an optimization method for the power density of the proton exchange membrane fuel cell by coupling machine learning and a swarm intelligence algorithm, has a fast convergence speed, can obtain an optimal solution or an approximate optimal solution under a small number of iteration times, effectively reduces the number of target function calls, significantly reduces the calculation time and the calculation cost, and has a strong global search capability and can avoid falling into a local optimum.

The invention relates to the field of microbial fuel cells, in particular to a tungsten-based nano-particle material, a preparation method thereof and application of the tungsten-based nano-particle material in preparation of a microbial fuel cell anode. The preparation method comprises the following steps: taking Na2WO4. 2H2O and C2H2O4. H2O as raw materials, carrying out hydrothermal reaction in an acid environment in the presence of thiourea, and drying after the reaction to obtain the tungsten-based nanoparticle material. The tungsten-based nanoparticle material with the nanoflower or nanorod structure is obtained. The voltage of the MFCs with the tungsten-based nano-material modified carbon paper composite electrode as the anode reaches 0.556 V (R = 1000 omega), and the average maximum power density reaches 2.32 W.m <-2 >, so that a device assembled by using the tungsten-based nano-material modified carbon paper composite electrode as the anode has excellent power output, possibility is provided for commercial application of the MFC, and the application prospect is good.

The invention discloses heat-resistant glucose dehydrogenase and application thereof in an enzyme fuel cell, and belongs to the crossing field of bioelectrochemistry and new energy technologies. According to the invention, firstly, a heat-resistant glucose dehydrogenase TeGDH is screened, and the heat-resistant glucose dehydrogenase TeGDH is subjected to heterologous expression in escherichia coli BL21 (DE3) and shows good heat stability and catalytic activity; teGDH is dissolved in an anolyte containing an electron mediator anthraquinone-2, 6-disulfonic acid disodium salt, and the heat-resistant high-energy enzyme fuel cell is prepared by adopting a non-immobilized system; the maximum power density of the battery at 50 DEG C reaches 1.74 mW / cm, and the battery has good thermal stability and long-term operation performance; the invention combines big data mining, enzyme engineering and electrochemical technologies, provides a novel enzyme fuel cell solution with high activity, high stability and low cost, and has a good application prospect.

A cathode material, and a preparation method therefor and the use thereof. The cathode material comprises a perovskite-type ferrite core and CeO2 nanoparticles covering at least part of the surface of the core, which can make the cathode material have high catalytic activity for oxygen reduction. By replacing Sr with Ca, the drawback of Sr being prone to segregation during high-temperature and long-term operation can be overcome, the problem of Sr reacting with an electrolyte to form a high-resistance third phase can be completely solved, and the tolerance of the cathode material to CO2 in a feed gas can be favorably enhanced. The chemical formula of the cathode material is LaaCa0.4-xCexCobFecO3-δ. By limiting the options for the elements in the cathode material and limiting the proportion of each element to be within a specific range, the cathode material is made to have high catalytic activity for oxygen reduction and structural stability for long-term operation, which thus enhances the electrochemical performance of a battery, and can reduce the overall impedance of the battery and increase the maximum power density of the battery.

The invention discloses a preparation method of a cellulose-based ion separation membrane as well as a product and application of the cellulose-based ion separation membrane, and belongs to the technical fields of membrane materials, ion transmission and green energy. The ion separation membrane is composed of an anionic cellulose layer and a cationic cellulose layer, by means of dissolution and regeneration, anionic cellulose and cationic cellulose are dissolved in a cellulose solvent respectively to prepare solutions, then composite cellulose gel is formed through blade coating and coating, and finally the ion separation membrane is prepared through soaking and drying treatment. By adjusting the thickness ratio of the anion and cation cellulose layer, the membrane is endowed with a typical charge heterostructure, and rapid selective transmission of ions and excellent ion rectification characteristics are realized; meanwhile, the composite membrane is of an integrated structure, interlayer bonding is firm, and stability is excellent; the membrane can efficiently convert salinity gradient energy into electric energy, the maximum power density can reach 13.81 W / m < 2 >, the stability exceeds 30 days, and a new way is provided for developing efficient, green and renewable salinity gradient power generation membrane materials.

The invention discloses a hydrogen production formaldehyde fuel cell which is characterized by comprising an anode, a cathode, a diaphragm, an anode chamber electrolyte and a cathode chamber electrolyte, wherein the anode contains an anode catalyst, and the anode catalyst is selected from at least one of formaldehyde oxidation reaction catalysts; the cathode contains a cathode catalyst, and the cathode catalyst is selected from at least one of hydrogen evolution reaction catalysts; the electrolyte in the anode chamber is an alkaline electrolyte containing formaldehyde, and the electrolyte in the cathode chamber is an acidic electrolyte; and the anode chamber electrolyte and the cathode chamber electrolyte are separated by the diaphragm. The hydrogen production fuel cell not only can realize power generation, but also can produce hydrogen at a cathode and an anode at the same time, the Faraday efficiency of hydrogen production reaches 200%, and the hydrogen production fuel cell is a novel hydrogen production formaldehyde fuel cell, has the open-circuit voltage of 1.1 V and the maximum power density of 94 mW cm <-2 >, and is good in stability, low in price, simple to operate, excellent in performance and good in application prospect.

The utility model discloses a high-power density PTC water heater, which comprises a PTC heating body, a shell and a wire harness, the PTC heating body comprises a PTC heating core and an aluminum casting, the PTC heating core comprises a PTC sheet, an electrode sheet and an insulating protection frame, and the upper part and the lower part of the PTC sheet are connected with the electrode sheet through heat-conducting glue; the aluminum casting comprises a PTC heating core mounting seat, an upper cover and a flange I, a mounting cavity matched with the PTC heating core is formed in the middle of the PTC heating core mounting seat, and flow guide ribs are arranged on the bottom surface of the PTC heating core mounting seat and the upper surface of the upper cover; the shell comprises a cavity for containing the PTC heating body, a water inlet, a water outlet and a flange II, and a liquid flowing channel is formed between the flow guide ribs and the cavity. Through innovative design of the structure, insulation, heat dissipation and liquid flow channels of the heater, the whole structure is simple, the size is small, the maximum power density above 58W / cm < 2 > can be achieved, and the size, the weight and the cost of the heater are effectively reduced.

The application discloses a thermoelectric interface material and a preparation method thereof, and a thermoelectric device. a Ag b X c , X is a transition metal, a, b, c are atomic ratios, a = 0-2.5; b = 0-1.5; c = 0-1.5, and a, b, c are not zero at the same time. The thermoelectric device comprises the thermoelectric interface material. The thermoelectric interface material has a contact interface with high bonding strength and low contact resistivity of MgAgSb TEcM, and has excellent welding and thermal shock resistance in the phase transition temperature range. The thermoelectric device shows a maximum power density of 0.8 W cm ‑2 and a maximum conversion efficiency of 9.1% at a temperature difference of 325 DEG C, which is a breakthrough value of the full Mg-based Te-free thermoelectric device in the low temperature range. The application provides an ecological, high-performance and low-cost alternative solution to replace the traditional Bi2Te3-based thermoelectric device for low-grade waste heat recovery.

A flexible triboelectric nanogenerator (TENG) has attracted much attention due to its environmentally friendly, practical, and cost-producing advantages. Flexible electrodes are required to fabricate a fully flexible TENG device. Electrical properties of porous polydimethylsiloxane (PDMS) sponge-based flexible TENGs with two types of flexible electrodes including copper and carbon nanotube (CNT)-PDMS were compared. Output voltages and maximum power densities of the PDMS sponge-based flexible TENGs with the copper and CNT-PDMS electrodes were compared. The voltage and the power density of the PDMS sponge-based flexible TENG with the CNT-PDMS electrodes were shown to be improved compared to the copper electrodes. The output voltage and the maximum power density of the PDMS sponge-based flexible TENG with the CNT-PDMS electrodes increased 4 times and 7 times, respectively, compared to the PDMS sponge-based flexible TENG with the copper electrodes because electrical conductivity is higher and electricity more stably flows in CNTs than in copper.

The invention discloses a novel carbon-encapsulated iron particle confinement catalytic biological battery cathode and a preparation method thereof.The preparation method comprises the steps that firstly, an ethanol dispersion solution of ZIF-8 and a K3 [Fe (CN) 6] solution are stirred, a ligand exchange reaction is conducted, a ZIF-8 (at) ZnFePBA precursor is generated after centrifugal washing and drying are conducted, then the ZIF-8 (at) ZnFePBA precursor is calcined in the inert atmosphere, and a novel carbon-encapsulated iron particle cathode catalyst (Fe / FinCx (at) NC) is obtained. Fe / FinCx (at) NC is doped into activated carbon, the activated carbon, PTFE emulsion and a proper amount of absolute ethyl alcohol are mixed and stirred according to the doping rate, slurry obtained through ultrasonic treatment serves as a catalyst layer, and then the catalyst layer and a stainless steel mesh current collection layer with the back face coated with conductive carbon black are co-pressed to obtain the air cathode. According to the carbon-encapsulated iron particle confinement catalyst disclosed by the invention, the output power of the activated carbon air cathode biological battery is remarkably improved by 134.5%, the output maximum power density is 2251 + / -43mW.m <-2 >, and the commercial application prospect of the activated carbon air cathode biological battery is very wide.

Optoelectronic sensor (10), in particular a 3D camera, for detecting a surveillance area (12), wherein the sensor (10) comprises an image sensor (16a-b), a lighting unit (20) for at least partially illuminating the surveillance area (12) with a lighting field (26), and a lighting control (28) designed to adjust the power of the lighting unit (20) to comply with protection requirements, wherein the sensor (10) further comprises a distance-measuring optoelectronic additional sensor (38) that checks the distance at which an object (42) is located in the lighting field (26), and wherein the lighting control (28) performs the power adjustment as a function of the distance measured by the additional sensor (38) and in accordance with a permissible maximum value, wherein the maximum value is a discrete function as a function of the measured distance, which has at least one maximum value for close distances,for distances in a range (34) in which an eye is hit with maximum power density, and for longer distances.

The application relates to an atomic dispersion non-noble metal catalyst based on a defect ligand and a preparation method and application thereof, and relates to an atomic dispersion non-noble metal catalyst and a preparation method and application thereof. The application aims to solve the technical problem of low catalytic activity of existing single-atom transition metal carbon-based catalysts, and the catalyst is composed of MN4 embedded in a carbon carrier, wherein M is coordinated with N in two different M-N bond lengths, and a 2N t =M=2N c coordination structure is formed. The preparation method is as follows: a three-dimensional nitrogen-doped porous defect type flower-shaped carbon carrier is prepared by utilizing the thermal instability of a defect ligand, then a catalyst is obtained by impregnation adsorption and heat treatment. The carbon carrier of the catalyst has a hierarchical porous structure of micropores and mesopores, the catalyst has asymmetric sites, and the maximum power density of a fuel cell assembled by using the catalyst as a cathode reaches 862 mW cm ‑2 , and the catalyst can be applied to the fields of proton exchange membrane fuel cells and metal air batteries.