基于运行参数的直接甲醇燃料电池的实验

Experimental study of DMFC based on operating parameters

通过改变直接甲醇燃料电池的运行参数,研究了阳极甲醇流量、阴极空气流量、温度、阴极空气背压和甲醇浓度对电池性能的影响。研究表明:电池性能随阳极甲醇流量的增加先升高后降低,存在一个流量最优值;阴极空气流量提高有利于产物水的排出,从而提高电池性能;电池性能随电池温度的升高而提高,过高的空气预热温度使阴极过分干燥,从而使电池性能降低;甲醇浓度存在一个最优值,从而使电池性能最佳,此外,提高阴极空气的背压能够有效抑制甲醇渗透的负面影响。

The effects of the methanol flow rate, air flow rate, temperature, cathode back pressure and methanol concentration on the performance of a direct methanol fuel cell （DMFC） were studied. The results show that the fuel cell performance increases first and then decreases when the methanol flow rate is increased, i.e., there exists an optimal methanol flow rate. The increasing air flow rate helps to exhaust the cathode water, so that the fuel cell performance is improved. Also, the fuel cell performance increases when the fuel cell temperature rises. The excessive air preheating temperature makes the cathode dehydration, thus reduces the fuel cell performance. The effect of methanol concentration on the performance of fuel cell is mainly due to the methanol permeability. There exists an optimal methanol concentration to make the fuel cell performance best. The experiments show that the cathode back pressure can effectively suppress the methanol permeation.