Synthesis Of Non-Noble Metal Nanocatalysts On Nickel Foam And Their Electrocatalytic Performances

At present,environmental pollution is serious and fossil energy is increasingly exhausted,so it is urgent to find efficient and environmentally friendly alternative energy.Hydrogen energy has the characteristics of high energy density,renewable and pollution-free.Electrochemical water decomposition has become one of the most promising strategies for hydrogen production.Electrocatalysts for electrochemical water decomposition are usually precious metals such as platinum,iridium and ruthenium,but their relative scarcity and high price limit their application.Therefore,the development of cheap and excellent performance of non-noble metal based electrocatalyst is the priority of future research.In summary,this paper aims to efficiently regulate non-noble metal base materials through morphological and structural changes,atomic doping,interface modification,etc.,and prepare excellent electrocatalysts.1.A cobalt vanadium-phosphorus ternary catalyst with nano-flower structure was synthesized directly on nickel foam by a simple two-step method.Through the combination of V and P,Co-VOx-P showed excellent electrocatalytic performance for both HER and OER under alkaline conditions.Electrochemical measurements show that only 98 m V ultra-small potential is needed to achieve a 10 m A/cm² HER current density and to provide a low Tafel slope of 59 m V/dec^-1.Only 230 m V ultra-small potential is needed to achieve a 100 m A/cm²OER current density.And offers a very low Tafel slope of 64 m V/dec^-1.By density functional theory（DFT）,the reason why vanadium incorporation can improve the electronic conductivity of active materials and enhance their catalytic performance was further analyzed.2.Amorphous MoV catalyst was prepared,its dosage was optimized,and its activity and stability in alkaline solution were studied.Electrochemical test results showed that amorphous MoV catalyst had excellent HER performance.When the current density was 10 m A/cm²,the overpotential of the amorphous MoV catalyst was 78 m V.After 1000 cycles of stability tests of LSV,the hydrogen evolution performance is basically unchanged and still smaller than most reported non-noble HER catalysts.The excellent properties are mainly due to the amorphous and two-dimensional nanorods morphology.3.Nickel,Manganese,Copper and Iron doped（Fe,Mn,Ni,Cu）-MoV were synthesized by one-step hydrothermal method.When the current density is 100 m A cm^-2 in 1.0 M KOH electrolyte,the oxygen evolution overpotential of（Fe,Mn,Ni,Cu）-MoV exceeds most of the known oxygen evolution catalysts in the range of 340 mv-400 m V.In particular,Ni-MoV oxygen evolution overpotential is only 340 m V.Meanwhile,its stability did not decay in 24 h and 1000 cycles of CV scanning.