低铂多组分燃料电池催化剂的制备及其性能研究-材料工程专业论文.docxVIP

哈尔滨工业大学工程硕士学位论文 哈尔滨工业大学工程硕士学位论文 万方数据 万方数据 Abstract The energy is the vital material base on which then human society relies for survival and development. At present, non-renewable energy resources such as coal and oil are one of the most important energy resources, which are widely used in our daily life and industrial production. But they are non-renewable resources and earth storage capacity is limited. While traditional heat engines convert chemical energy to heat, electricity and other energy , their efficiency is fundamentally limited by the Carnot’s theorem. Therefore, the energy utilization ratio is low, and the environment is seriously polluted. Fuel cells have a wide range of advantages such as high energy conversion efficiency and wide application. They are also environmentally friendly and available with variety of fuels, which are much concerned day by day in the process of looking for new energy technologies. Currently, commercial Pt catalyst is the most wide used catalyst in fuel cells. However, Pt catalyst has some main problems. (a) The high cost of clothes and resource scarcity bring the high cost of fuel cells. Therefore, lowering the costs without loss of the performance is still the obstacle for the commercialization of fuel cells. (b) Some poisonous intermediates such as CO will be generated and strongly adsorbed on catalyst surface in the process of ethanol electro-oxidation, blocking the surface active sites from further catalysis. So we change the structure and component of the catalysts to get higher catalytic activity and stability. (c) Develop reasonable preparation method of catalysts to reduce cost and synthesis ideal catalyst. The main problems are the obstacles for the commercialization of fuel cells. Based on the above consideration, in this thesis, we design a facile route for the large-scale synthesis of low-Pt and stable TePtPd catalysts by using Te nanoribbons as both sacrificial templates and reducing agents, which have special s