Application Of Carbon-funded Nanoclusters Composites In Electrocatalytic Water Separation

The excessive consumption of traditional fossil energy has caused irreparable damage to the earth,and it is pressing to develop a new energy structure that is pollution-free and can be recycled.As a renewable green energy source,hydrogen has a very high energy density,which makes it has the development potential extremely.Using renewable energy for water electrolysis to produce hydrogen is an important strategy for future energy composition.However,the main reactions during water electrolysis,hydrogen evolution and oxygen evolution,are slow and higher thermodynamic barriers need to be overcome to achieve the desired current density,which results in a lower energy conversion rate.Therefore,it is of great practical significance to develop a catalyst with high activity and high stability for water electrolysis.This paper mainly studied the growth of polypyrrole induced by ferric chloride and impregnated by metal nanoclusters on three-dimensional self-supporting material nickel foam.After high temperature carbonization,a Fe and N double-doped sheet carbon material with metal nanoclusters composite is formed on the surface of nickel foam(MNCs-ppy_FC/NF).In this paper,copper nanoclusters composite catalysts and platinum nanoclusters composite catalysts were successfully synthesized,and their catalytic mechanism was analyzed through experimental exploration,control setting,and related physicochemical characterization.The CuNCs-ppy _FC/NF and Pt NCs+PtS₂-ppy _FC/NF exhibit excellent hydrogen evolution activity in alkaline electrolyzed water,and their overvoltages at a current density of 10 mA/cm² are 75 mV and 21 mV,respectively.In addition,CuNCs-ppy _FC/NF also exhibited an excellent oxygen evolution activity,with an of 270 mV overvoltage at a current density of 10 mA/cm².After spherical aberration electron microscopy and synchrotron radiation test,we can obtain that Fe elements in composite catalysts are doped in carbon materials by the form of Fe-N₄,and its synergistic effect with metal nanoclusters can optimize each other’s electronic structure,.improve the hydrogen adsorption energy of metal nanoclusters in the process of water electrolysis and enhance the conductivity of Fe single atoms,thereby improved the catalytic activity of hydrogen evolution and oxygen evolution.More noteworthy is that a large number of PtS₂ species are scattered around the platinum nanoclusters in platinum nanoclusters composites prepared by etching method.The structural state of coexistence between PtS₂ species and Pt nanoclusters can further improve the electronic structure of Pt nanotusters and increase their intrinsic activity,thereby promoting the occurrence of hydrogen evolution reactions.