Preparation of Porous CNFs by Selective Catalytic Gasification and their Characteristic Evaluation for Supported Catalysts

摘要

In the catalysts of polymer electrolyte membrane fuel cells, the durability as well as the catalyst activity has been a big issue of fuel cells. There are two reasons of catalyst degradation. The first is metal dissolution. (Including the particle growth) The second is carbon corrosion. Metal dissolution is governed by the interaction between carbon and metal catalysts and the crystallinity of metal. Its cause actual loss of precious metals and also increase of the particle size (Ostwald ripening). On the one hand, the electrochemical corrosion of carbon support is one of challenging issues in the electrode catalysts. Because of generally high crystallinity of carbon for improvement of anti-oxidation properties cannot be obtained by such treatments that make carbon materials of high surface area for high dispersion of catalyst nano-particles. High activity and high durability of catalysts seem to be very contradictory.