Recently, China Industry News reporter learned in Harbin Engineering University School of Materials Science and Chemical Engineering was interviewed, Professor Cao Dian Xue led by the Institute of New Energy Materials and Electrochemistry, "micro-nano 3D array electrode", through the 3D structure design, micro-nano Preparation and active material composition optimization, with its replacement of the traditional use of adhesive bonding electrode, the preparation method is simple, greatly improving the performance of the battery or capacitor, and has considerable production and application value, by experts in this field at home and abroad The widespread attention, marking a micro-nano structure of 3D array electrode preparation and electrochemical properties of new breakthroughs.
According to reports, due to its unique advantages, fuel cells, supercapacitors and lithium-ion batteries are regarded as the main power source of new energy vehicles. Their development and research are greatly valued by governments, academia and enterprises all over the world. Among them, the research of electrode material is the most important, the quality of electrode materials directly affects the performance of chemical batteries.
The newly prepared 3D Co3O4 foamy nickel nanowire arrays with nanowires diameter of 50 ~ 250 nm and length of 10 ~ 15 μm were fabricated. The charge-discharge cycles of single electrode were maintained at 529.7 F? G-1 after 500 cycles The high specific capacity. The results using ammonia induced template method, prepared on the cheap nickel foam CuO nanosheet electrode and mesoporous Ni (OH) 2 electrode, which Ni (OH) 2 electrode current density of 1 A? G-1 constant current Charge and discharge test, the discharge capacity up to 1030 F? G-1. The results show that the lithium insertion capacity is 1005 mAh? G-1 after 103 cycles of charge and discharge, and the lithium removal capacity is 1005 mAh? G-1. With a capacity of 975 mAh? G-1 and an irreversible capacity of only 3%, it shows very impressive reversibility and good cycling performance.
New achievements In fuel cells, in order to reduce fuel cell costs, for the first time by pre-structured with a three-dimensional array of nano-conductive matrix to achieve a simple preparation of highly efficient catalyst, greatly improving the utilization of precious metal catalyst. The Pd-C @ TiO2 three-dimensional micro-nano array electrode was obtained by using C @ TiO2 nanorod arrays obtained from the growth of acetone pyrolyzed on the surface of titanium plate as the skeleton. Pd was loaded on the nanorods by electrodeposition. Au particles with a diameter of about 50 nm were obtained on the surface of nickel foam by the self-reduction method and used as the anode and cathode electrodes of the direct borohydride-hydrogen peroxide fuel cell. The assembled fuel cell can reach the maximum power density of 102 mW ? cm-2.
New achievements In the reaction mechanism, for the first time found Co-based metal oxide on hydrogen peroxide electrochemical redox catalytic role, also found that through the 3D nanowire structure design and lattice modulation, can effectively improve the catalytic activity of the electrode and Selectivity, preliminary proposed H2O2 reduction in alkaline medium and reaction speed control steps.
It is reported that the new achievements to overcome the traditional two-step electrode preparation method requires the binder and the conductive agent and the low utilization of electroactive materials and other issues. At the same time, the proposed carbon-free binder-free self-supporting catalytic electrode, Co-based metal oxide on hydrogen peroxide electrochemical redox catalytic mechanism to enrich and develop the battery, capacitors and other chemical power theory, has important engineering Value. These research results have been highly praised by domestic and foreign counterparts. Many well-known scholars refer to the basic reaction theory, design ideas and preparation methods proposed by the new achievements when researching the nanowire electrodes. Among them, three articles cited 100 times and 7 articles Article into the ESI high cited papers.
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