Preparation Of Graphene-Based Composite Materials For Electrocatalysis And Photocatalysis

Graphene is one kind of two-dimensional carbon materials with the ultra-high specific surface area and unique photoelectric properties.In this paper,two materials of CoZnP/graphene aerogels and Au/F-TiO2@graphene hire graphene as carbon supporter were synthesized for overall water splitting and photocatalytic degradation of acid orange.MOFs,an inorganic-organic mixed porous material,possess adjustable structure and composition,which makes it the most promising catalyst for replacing precious metals in the field of electrocatalysis.However,traditional MOFs have poor conductivity and stability.In order to overcome this limitation,creating the composite material composed of MOFs derivatives and graphene is a feasible solution.Based on the graphene aerogel as a substrate,this subject creatively synthesized bimetal MOF derivative CoZnP/graphene aerogel(GA)in one step,explored the optimal ratio of cobalt and zinc as well as calcination temperature.Co0.75Zn0.25P/GA-750? shows excellent all-pH HER and OER in alkaline and in the total hydrolysis performance,the corresponding voltage at a current density of 10 mA cm-2 is 1.591 V,lower than that of Pt/C and RuO2,which is attributed to:3D graphene aerogels having a three-dimensional electron transport network;bimetal doping avoiding the aggregation of cobalt active sites;multi-layered pore structure(micropores,mesopores and macropores)promoting the transport of electrons and substances.In order to meet the growing demand for fresh water,wastewater reuse is one of the most important means.Solar energy,one of green energy sources,is inexhaustible.We synthesized Au/F-TiO2@graphene with excellent photocatalytic degradation of acid orange.The acid orange can be completely degraded in 3 hours under 500W xenon lamp,which is owing to:TiO2 can obtain more highly active 001 crystal planes after HF treatment;Precious metal gold nanoparticles can make semiconductors absorb more sunlight to generate more photoelectrons;Graphene contributes to accelerate separation of electrons and vacancies on TiO2.