加热喷雾法制备DMFC扩散层的性能研究

摘要

In this paper, the membrane electrode assembly was prepared by heated-spray method and a single direct methanol fuel cell system was assembled and tested. Electrochemical performance of DMFC in various technological parameters such as cell temperature and air flow rate was investigated by means of steady-state potentiostatic polarization under the ambient pressure. The experimental results show that MEA prepared by heated-spray method has excellent diffusion layer structure with good performance. The output current density and power density are 206.20 mA/cm~2 and 55.88 mW/cm~2 respectively with ambient air as cathode oxidant when the working temperature is 55 ℃ and the output voltage is 0.271 V. The two technological parameters have significantly affected the performance of a direct methanol fuel cell. The optimum technological parameters are air flow of 670 mL/min, and the cell performance rapidly increases with the rise of the cell temperature.%采用加热喷雾制备扩散层的新方法,制备出性能优良的膜电极,并组装成单电池进行测试,对电池温度和空气流量两个电池运行参数进行研究.结果表明:加热喷雾法制备膜电极具有良好扩散层结构,获得了优良的电池性能;在电池温度为55℃、输出电压为0.271 V时,电池输出电流密度和功率密度分别达到了206.2 mA/cm~2和55.88 mW/cm~2.同时实验还表明,空气最佳流量为670 mL/min,电池温度的提高有利于电池反应的动力学,进而大幅度提高电池性能.