Preparation Of Nickel-Corrper-Based Electrocatalyst And Its Performance In Water Electrolysis

Hydrogen energy is regarded as a kind of potential clean and sustainable energy,has a broad market application prospect.Among many hydrogen production ways,water electrolysis is considered to be an economical and environmentally friendly method that can produce high purity hydrogen in large quantities.The water electrolysis process is usually divided into hydrogen evolution reaction（HER）and oxygen evolution reaction（OER）.Water electrolytic process Currently,precious metal Pt and Ir/Ru-based oxides as the most efficient water electrolytic catalysts for HER and OER,respectively.Yet,they are limited by scarce resources and high cost in the application process.Over the past decade researchers have been developing cost-effective non-precious metal catalysts through rational design of catalyst structure and composition.Among them,transition metal catalysts with low cost and high reserves have been proved to have high catalytic activity comparable to precious metals,making it possible to use them for high efficiency water electrolysis.In this paper,by designing the structure and composition of transition metal catalysts reasonably,two new bimetallic materials were synthesized with metal foam as the substrate,which achieved the high-efficiency catalysis of hydrogen evolution,oxygen evolution and complete water decomposition.The main contents are as follows:（1）The NiCu nanoalloy catalyst NiCu/IF-90)with optimal composition was prepared on the surface of foamy iron（IF）by a simple electrodeposition method by varying the current density and deposition time.The catalytic properties of HER and OER in 6 M KOH electrolyte solution were investigated.At the current density of 400 m A cm^-2,the overpotentials of hydrogen evolution and oxygen evolution were 282 m V,345 m V,respectively.In addition,this electrode shows good catalytic performance in alkaline electrolytic cell when the current density is 100 m A cm^-2,and the voltage is only 1.56 V.（2）Synthesized by in-situ etching of Cu（OH）₂ nanowires on the surface of Cu foam（CF）,and the core-shell structure Cu（OH）₂@Fe Ni-LDH nanowires were synthesized by soaking in the mixed solution of Fe Cl₂ and Ni Cl₂ at room temperature with excellent OER performance.The structure has a large specific surface area to expose more active sites.Finally,we have been studied the Oxygen evolution properties of basic electrolytes,in 1.0M KOH and 6M KOH,it is only need 350 m V of overpotential to drive current densities of371.6 m A cm^-2 and 637.6 m A cm^-2,respectively.it also keeps long time stability for the OER.