Sythesis Of Hierarchical Urchin-Like Nicop And Its Propertis As An Electrochemical Catalyst

With the increasing shortage of energy and the destruction of the environment,electrochemical decomposition of water attracts more and more attention as a renewable technology.Electrochemical decomposition of water contains two half reactions,they are hydrogen evolution reaction and oxygen evolution reaction.However,in the process of the reacion existing a complicated transformation of electrons and protons.This decreases the speed of electrochemical decomposition of water,thus the reaction needs higher potential to speed up the reaction.Higher potential decrease the activity of the catalysts,this limits the development of electrochemical decomposition of water.Therefore,it is pivotal to find out a bifunctonal electrocatalyst which has high activity and needs low overpotential for overall water splitting.Although great prograss has been made in non-noble metal electrocatalyst,it is still a big challenge to find an ideal electrocatalyst for overall water splitting.In this disssertation,hydrothemal method is applied to growdifferent NiCo（OH）_xprecursors on the 3D structure Ni foam by adjusting the reaction concentration and the reaction time.Then these three precursors are compared to each other,and the result is that reaction concentration and reaction time have an impact on the surface structure and loading.In the proper reacion condition,a high loading and hierarchical urchin-like precursor can be produced.The surface of this kind of precursor can promotes the surface area.Then the precursors with ideal surface structure are selected,after phosphorization by hydrothemal method,NiCoP electrocatalysts were got.After that,their catalysis activity and their characterazitionare tested.As a result,after phosphorization,there are lots of high valence state of Ni and Co,thus increasing the number of active sites,further more,it can protect the contact between catalysts and conductive matrix.In conclution,the NiCoP electrocatalyst within high loading and hierarchical urchin-like structure shows wonderfully good activity and durability in overall watersplitting.In alkaline solution,it need only 57 mV and 276mV in HER and OER to reach 10 mA cm^-2.