| In recent years,the energy crisis and environmental pollution have become more and more serious,research workers around the world are committed to researching and developing sustainable green energy systems.At present,hydrogen is considered as an environmentally friendly clean energy,which can be prepared by decomposition of water by electrocatalytic technology.Nowadays,electrolysis of water in acid and alkaline media is a technology that can achieve industrial hydrogen production.For many years,precious metals have been considered as the most active catalysts in this field,but the precious metal catalysts are scarce and expensive.In recent years,researchers have continued to explore the transition metal into a highly active hydrogen evolution catalyst.The Chong Hing point of our work lies in doping the biomass material and the functional polyionic liquid to prepare the carbon-based electrocatalytic hydrogen evolution material with low cost and strong use value,by changing the various experimental conditions,the catalytic performance has a small gap compared with the precious metal.Biomass carbon materials are a new and innovative idea in the fields of energy storage and electrocatalysis.The introduction of biomass will increase the specific surface area of the catalyst.The special internal pore structure is more conducive to the dispersion of electrolyte ions and the transfer of electrons during the reaction process,compared with the traditional high-performance platinum carbon（Pt/C）catalyst,the catalyst has more practical value.Up to now,platinum and platinum based catalysts still have excellent stability and catalytic activity.However,precious platinum resources are scarce and expensive,which severely limits their wide application in the field of electrochemistry.Therefore,carbon materials can be used as the most ideal load material in the field of electrocatalysis.Its unique porous structure is easy to load materials,and makes composite materials have high activity for a long time.Carbon materials can not only improve the utilization rate of catalysts,but also can be used as a cathode nonmetal catalyst after surface modification.Therefore,the research field of carbon materials is attracting more and more attention.Ionic liquids as "green solvents" has a unique physical and chemical properties,such as wide electrochemical window,electrical conductivity and good thermal conductivity,high light transmittance and good refraction rate,non volatile,wide liquid range,negligible vapor pressure,high thermal stability,solvent selection.Therefore,the composite of biomass materials and polyionic liquids and carbonized into high quality new carbon materials at high temperature have attracted much attention in the field of electrochemistry.In this paper,the basic research on improving the activity and stability of the electrocatalyst has been carried out.Two kinds of biomass carbon materials were prepared from natural biomass composite functional polymer materials.They were applied to the hydrogen evolution reaction（HER）,oxygen evolution reaction（OER）and electrochemical performance test of solid capacitors.The samples were characterized by nitrogen adsorption and desorption（BET）,X-ray powder diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,Raman,EDX analysis,elemental analysis,scanning electron microscopy（SEM）and transmission electron microscopy（TEM）and other means were used to characterize the structure and composition of biomass carbon materials.At the same time,the activity of the catalyst in acidic and alkaline media was tested by cyclic voltammetry（CV）,linear sweep method（LSV）and galvanostatic charge-discharge method（GCD）.1: Preparation of carbon materials by functionalized ionic liquid doped with BSA for hydrogen evolution reaction:Nitrogen and sulfur co-doped mesoporous carbon（NSPC）were prepared by direct carbonization of natural bovine serum albumin（BSA）-doped functional poly（ionic liquid）（Tf2N）composite and used for hydrogen evolution reaction（HER）in acidic and alkaline media,and oxygen evolution reaction（OER）in alkaline medium.The structure and composition of the samples were characterized by XRD,XPS,Raman,BET,EDX,SEM and TEM.The electrocatalytic activity and energy storage ability of the samples were tested by electrochemical methods such as CV,GCD and LSV.The electrochemical tests showed that the carbon materials exhibited excellent catalytic performance in HER and OER,and their overpotentials at 10 m A/cm2 current density were 165 m V and 460 m V,respectively,which is higher than the reported metal free catalysts.2: Preparation of carbon materials by functionalized ionic liquid doped alginic acid and its electrocatalytic performance:Nitrogen and sulfur Co doped micro / mesoporous carbon carriers（AA@PCMVIm Tf2N）were prepared by direct carbonization of natural alginate（AA）doped functional polyionic liquid（Tf2N）composites,and used for hydrogen evolution reaction in acidic medium（HER）.Since the material itself can be carbonized to a film,and the performance of stored energy is better,a solid capacitor is designed and prepared.The structure and composition of the samples were characterized by XRD,Raman,BET,EDX,SEM and TEM.The electrocatalytic and energy storage activities of the samples were tested by electrochemical methods such as CV,GCD and LSV.The electrochemical test shows that the overpotential can reach 146 m V when the current density is 10 m A/cm2,and the performance of the electrocatalytic hydrogen evolution is better.Moreover,the unique electrostatic adsorption of alginate and polyionic liquids can make carbonized materials into a complete carbon membrane.This material has potential applications in the field of electrocatalysis and solid capacitors. |
