Preparation Of Composite Metal Oxide/Carbon Nanofibers And Electrocatalytic Performance For Hydrogen Evolution

Energy and environment concerned problems are of importance in the sustainable development of human society.The exploitation of environment friendly energy sources is an inevitable trend to implement the sustainable development.As an ideal clean energy,hydrogen can be industrially produced by electrolysis of water.This method is easy to operate,non-polluting,clean and environmentally friendly,etc.The ideal electrocatalytic material should have a small overpotential,a large current density,a large specific surface area,superior electrocatalytic activity,good electrical conductivity and excellent long-term stability.It is worth noting that the most effective hydrogen evolution reaction?HER?electrocatalysts were based on precious metals,especially,platinum.However,the limited resources of noble metals hinder their utilization in practice because of the high cost.Therefore,it is urgent to develop effective replacements with rich content and low energy consumption towards HER electrocatalystsIn this paper,HPA and NiAc₂ were taken as precursor,Then,the as-obtained aqueous solution was used to prepare fibers via electrospinning method followed by annealing process to synthesize the crystalline.At the same time,their morphology,structure and hydrogen performance were tested.The main contents are as follows:1.First of all,H₃PW₁₂O₄₀(PW₁₂)and Nickel?II?acetate?NiAc₂?at different molar proportion were taken as precursor.Then,the as-obtained aqueous solution was used to prepare fibers via electrospinning method followed by annealing process to synthesize the crystalline PW₁₂Ni₅O_43.5?isogenous?nanocomposites.PW₁₂Ni₅O_43.5/FTO?isogenous?was compared with PW₁₂Ni₅O_43.5/FTO?heterologous?and W₁₂Ni₅O₄₁/FTO by the same characterization method and electrochemical test.The results show that the crystalline PW₁₂Ni₅O_43.5?isogenous?obtained at molar proportion of PW₁₂ to NiAc₂ in 1:5 exhibited excellent HER properties with small Tafel slope of 57 mV/decade and low overpotential of-0.35 V.So,PW₁₂Ni₅O_43.5/FTO?isogenous?has better electrocatalytic hydrogen evolution activity.2.First of all,silicotungstic acid(SiW₁₂)and NiAc₂ at different molar proportion were taken as precursor.Then,we have developed a facile method to fabricate SiO₂/WO₃/NiWO₄ decorated carbon nanofibers via electrospinning and carbonization under nitrogen atmosphere.SiWNi-CNFs were compared with SiW-CNFs,WNi-CNFs,W-CNFs by the same characterization methods and electrochemical tests.The SiWNi-CNFs displays outstanding and stable electrocatalytic performance with low overpotential of-0.32 V at the current density of 10 mA cm^-2 and small Tafel slope?48mV/decade?.Therefore,SiWNi-CNFs have excellent electrocatalytic hydrogen evolution activity.