The Preparation Of Anode Non-precious Metal Catalysts And The Applications In Catalysis

Energy and pollution have been the two major problems in human society.Lack of energy and environmental pollution problems need to be resolved as a result of the excessive use of traditional fossil fuels.Among the numerous kinds of new energy,hydrogen is the most promising one.It not only has a high combustion value,but also can be obtained directly from the water by a simple electrolysis process,and the product is also water which can form a good recycling.Transition metal catalysts are attracting more and more attention due to their unique catalytic properties.In this paper,Mn/Ni@CFP and Co-Fe composite catalyst were prepared as anode catalytic materials and they can be efficient electrolysis of water to prepare hydrogen.The carbon-based catalysts for manganese and nickel co-deposition were prepared by ultrasonic reduction and electrodeposition method,and their catalytic and kinetic properties in different environments were studied.The prepared Mn/Ni@CFP material exhibits excellent catalytic performance in the urea environment and has good stability at a certain urea concentration.The morphology was characterized by SEM and TEM and the surface composition of the catalyst was analyzed by XPS and Raman method.The conductivity of the catalyst is improved by loading on carbon paper,and the catalytic activity is further improved by the coordination of manganese and nickel.The catalyst can be used as a self-supporting electrode directly for the electrolysis reaction,avoiding the contact resistance caused by the coating process.Three kinds of catalytic materials with three-dimensional nanostructure(Co-Fe composite catalysts,Fe-only and Co-only)were prepared by simple chemical reduction method.The effects of Co and Fe on the morphology and crystallinity of the catalysts were analyzed by SEM,TEM and XRD.The composition of each catalyst was determined by XPS.In the oxygen evolution reaction,the presence of Co is the main reason for the change of oxidation state,and Co will greatly reduce the onset potential of oxygen evolution reaction.The change of the oxidation state with the electrochemical process can be obtained by combining the CV curves and XAS.