Metal Alloy Supported On Carbon For Small Molecules Electrocatalysis

As the energy crisis and environmental pollution continue to deteriorate,people have been aware of the importance of clean energy.Hydrogen is considered as the best energy carrier in 21 Century for its advantages such as wide source,no-pollution and renewable.And fuel cells as green storage and transfer equipment also catch many scientists' attention for low temperature,their high efficiency of energy conversion,and zero emission.Specially,hydrogen evolution?HER?,oxygen evolution?OER?,and oxygen reduction?ORR?are all important electrocatalytic reactions.However,the high overpotential and the slow kinetic process of these reactions stop their development.Catalysts must be used to reduce the reaction energy barrier to improve the reaction.Now,the most catalysts used in these reactions are platinum,palladium,iridium,ruthenium or other precious metal catalysts,while the limited resources and the high cost of these precious metal limit the development of water electrolysis and fuel cell.In view of these problems,Pt2Pd/NPG catalyst were prepared by a simple method to reduce the cost of catalyst,improve the utilization rate of platinum and enhance the interaction between carrier and metal particles.The detailed contents of this work are listed as follows:?1?Pt2Pd/NPG catalysts were prepared by one-step hydrothermal and hightemperature calcination.The morphology of the catalysts were characterized by TEM,SEM,XRD,XPS and BET.The results show that in the process of high temperature calcination,nanopores were etched by metal particles.By using electrochemical techniques,such as cyclic voltammetry and linear voltammetry,to study the catalytic performance,whether it is found Pt2Pd/NPG catalysts own wonderful catalytic activity,anti-methanol poisoning performance and excellent stability,no matter under acidic condition or alkaline condition.?2?The NC@Mo W₃O/CC catalyst was prepared by two-step hydrothermal and high-temperature calcination.It was observed by SEM that the morphology of the catalyst was transformed from Mo W₃O/CC nanowires into MoW₃O/CC nanosheets,which was uniformly grown on carbon fibers.By hydrogen evolution and oxygen evolution reaction test,we found that Mo W₃N/CC catalyst has good catalytic activity,which is own to the new three-dimensional carbon fiber carbon materials as catalyst with large specific surface area and good conductivity.