Nickel phosphate/nickel oxide composite material as well as preparation method and application thereof

Abstract

The invention belongs to the field of electro-catalytic materials, and discloses a nickel phosphate / nickel oxide composite material as well as a preparation method and application thereof. The preparation method comprises the steps that a direct-current power supply of a two-electrode system is used, Ni-Fe alloy is used as an anode, graphite is used as a cathode, a solution containing phosphate isused as an electrolyte, and a layer of nickel phosphate / nickel oxide composite material is generated on the surface of an anode alloy matrix in situ through micro-arc oxidation under the condition that the pH value is 3-12. The prepared nickel phosphate / nickel oxide composite material has excellent oxygen evolution catalytic activity in a neutral environment, the over-potential is 660 mV when thecurrent density is 10 mA cm<-2>, and the nickel phosphate / nickel oxide composite material has good electrochemical stability and can be applied to the field of hydrogen production through water electrolysis.

Description

technical field [0001] The invention belongs to the field of electrocatalytic materials, and in particular relates to a nickel phosphate / nickel oxide composite material and a preparation method and application thereof. Background technique [0002] The global energy crisis and environmental problems caused by the combustion of fossil fuels are increasingly affecting the survival and development of human beings. It is necessary to develop clean, efficient and renewable new energy sources. Due to its high energy density, abundant earth reserves, and non-polluting combustion products, hydrogen energy has become the most promising new energy source for the sustainable development of the world in the future. [0003] Among the current hydrogen production methods, hydrogen production by electrolysis of water is considered to be the most promising and sustainable hydrogen production method due to its wide range of raw materials, simple process, reliable technology, easy production ...

AI Technical Summary

Problems solved by technology

A series of transition metal oxides and hydroxides with excellent catalytic performance in alkaline environment are not outstanding in oxygen evolution catalytic performance in neutral environment, the reason is that although transition metal oxides and hydroxides have strong water Adsorption and decomposition ability, but its proton coupling ability is weak, and its conductivity is poor

Phosphate has become an excellent proton acceptor due to its unique electronic configuration, which can promote the coupling of protons in the oxygen evolution reaction. It is considered to be an attractive oxygen evolution catalyst used in a neutral environment. The traditional phosphoric acid Salt preparation methods include electrochemical precipitation method, hydrothermal method, two-phase colloid method, etc. Although the above preparation methods have certain advantages in composition control, they have defects such as complicated process, high toxicity of used drugs, and easy residues, which are difficult to large-scale. Large-scale industrial production, and additives and conductive agents need to be used in the preparation process, which reduces the contact area between the catalyst and the solution, and fails to fully utilize its active substances

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