Preparation Of The Biomass-derived Doped Carbon Catalysts And Their Application In Electrocatalysis

As the driving force of human beings engaged in various production activities,energy is closely related to the daily activities of human beings and it is the material basis of human development.With the outbreak of the global energy crisis,the rapid consumption of fossil fuels and the increasingly acute supply contradiction have led to the outbreak of the local political crisis.What's more,the environmental degradation caused by the massive combustion of fossil fuels has caused environmental pollution worldwide.Therefore,it is urgent to research and develop clean and sustainable environment-friendly energy to be the urgent task of human society.The hydrogen can be called the ultimate energy of human development and it is concerned by scientists around the world increasingly.Hydrogen electrolysis technology is one of the most widely used and mature methods for obtaining hydrogen.Electrolysis of water on the business at present reaction catalytic efficiency of the best electrode is still precious metals such as Pt,Pd,Ru,Ir,it has high catalytic activity,but the price is expensive,proven reserves is low,the middle of the preparation process produces a large number of pollutants,which restricted the development of the industrialization of electrolysis of water and the promotion.So researching and developing abundant,environmentally friendly,cheap,high catalytic activity of non-noble metal catalyst for electrolysis of water is a new energy economy bridgehead.For the single source of the precursor of carbon catalyst problem,this paper tries to use cheap natural biomass as raw material,through a certain heat treatment,to prepare a series of new type of high specific surface area,different structure and morphology catalyst for electrolysis of water.We assessed the influence of preparation process,chemical composition,and preparation conditions for the catalytic properties,and preliminary explored the biomass derived electrolysis catalytic mechanism of doped carbon catalyst.We used silkworm cocoon as precursor,and impregnation method is used to load Co,Mn metal,with high temperature graphitization method,we prepared honeycomb structure cobalt-manganese/silk cocoon carbon materials(Co-Mn/SCC)catalyst.By changing the mass fraction of Co,Mn metal can regulate the surface morphology of cellular structure,and it can form a cellular morphology of uniform hole distribution,metal active site well exposed.This structure reduces the electron transfer path and increase the conductivity of the material.3.0%Co-Mn/SCC has the best hydrogen dehydrogenation performance,the overpotential is 151 m V,Tafel slope is 130 m V dec-1;2.0% co-mn/SCC has the optimal oxygen analysis performance,initial potential is 1.5v,Tafel slope is 143 m V dec-1.Secondly we used silkworm cocoon as a precursor material,and impregnation method is used to load Co,Ni metal,and doping S element in the process of CVD.And finally we prepared a species anemones cobalt nickel sulfide/silk cocoon carbon materials(Co Ni S/SCC)catalyst.By changing the quality score of the Co and Ni metals to regulate the surface morphology and structure,and can form a uniform distributed Co Ni S/SCC.With the increase of crystallinity and the formation of graphite carbon structure,the conductivity of materials is greatly enhanced.The electrochemical performance test showed that 5.0%Co Ni S/SCC had the optimal oxygen analysis performance.The initial potential was 1.5v,Tafel slope was 151 m V dec-1,and showed good stability.Finally,the carbon materials of KOH activated silk cocoon(KOH/SCC)were prepared by using CVD method after the activation of the silk cocoons of KOH,and then applied to HER cathode catalyst materials.After activation of KOH and further carbonization,the silk cocoon has obtained a porous morphology of the network space structure with its pore size of about 30 nm.The test of electrocatalytic behavior of samples showed that KOH/SCC material had an initial potential of 121 m V,which was much better than the SCC without the activation of KOH,and shows certain stability.