Effect of different atmosphere heat treatment on the oxygen reduction performance of Pt/C catalysts prepared by continuous pipeline microwave technology
Vehicle proton-exchange membrane fuel cell is an important energy conversion device to solve the energy crisis and environmental degradation issues.However,the high cost and slow cathodic oxygen reduction reaction kinetics and poor stability of cathode catalyst in long-term operation have become the main challenges in its development.As such,a continuous pipeline microwave preparation technology was used to prepare a catalyst with 50%(mass)platinum loading.The Pt/C catalyst was annealed in two different atmospheres,namely,nitrogen hydrogen mixture(20%H2)and air.The effect of heat treatment in the two atmospheres on the oxygen reduction performance were studied through characterization and testing.The Pt/C-300(20%H2)catalyst can still maintain a high activity of 71.4 m2/g and 243mA/mg after 30000 cycles of attenuation testing,achieving both high activity and high durability.This work provides an effective and feasible way for the production of catalysts with high oxygen reduction performance.
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