Synthesis Of Growing-type Nickel Bicarbonate Catalyst And Its Catalytic Performance For Oxygen Evolution Reaction

With the increasing demand for energy,fossil fuels,as the main source of energy,are decreasing.Various environmental problems caused by fossil energy are also threatening the survival of human beings.Therefore,it is urgent for human beings to find a new type of energy which is independent of fossil fuels and rich in reserves.Hydrogen energy is a kind of new secondary energy that people expect in the emergence of conventional energy crisis and the development of new secondary energy,and water,the material of hydrogen production,is one of the most common substances on the earth.Therefore,hydrogen production from electrolytic water has become a hot research field.Water electrolysis is composed of hydrogen evolution reaction（HER）on cathode and oxygen evolution reaction（OER）on anode.At present,the bottleneck of improving the efficiency of water electrolysis is to reduce the overpotential of OER.Although ruthenium,iridium,platinum and other noble-metal-based catalysts have good catalytic activity,they are expensive and not suitable for large-scale application.Based on the above considerations,OER catalysts with different nanostructures based on nickel were obtained by a series of methods,and characterized their electrochemical properties by a series of methods.Firstly,iron doped nickel bicarbonate nanosheets grown on the surface of nickel foam（Ni Fe-NS/NF）were synthesized and characterized by XRD,SEM,TEM and so on,and their main components were determined.In terms of electrochemical performance,the overpotentials of 321 m V,360 m V and 450 m V were obtained at current densities of 100,500and 1000 m A·cm^-2,respectively.In addition,at a high current density of 1 A·cm^-2,the catalytic performance of the catalyst only decreased slightly after 48 hours,which can effectively achieve high current oxygen evolution reaction.Secondly,aluminum and iron doped nickel bicarbonate nanowires grown on nickel foam（Ni Fe Al-NW/NF）were synthesized,and then selectively removed the aluminum in nanowires in situ by 2000 CV tests.the overpotentials of 294 m V,332 m V and 377 m V were obtained at current densities of 100,500 and 1000 m A·cm^-2,respectively.In the durability test with current density of 1 A·cm^-2,Ni Fe Al-NW/NF remained stable for 40 hours.