低温下DMFC性能特性及传热传质分析

Performance and mass and heat transport analysis of a direct methanol fuel cell at low temperature

对自制有效面积为4.41cm2的直接甲醇燃料电池进行了低温(5℃)运行条件下的性能测试及分析,并着重研究了甲醇浓度,甲醇溶液流速和氧气流速等运行参数对电池性能的影响。实验结果表明,电池性能随运行温度的下降而降低。在较低运行温度下,运行参数对电池性能的影响有别于常温及以上温度条件下的规律。在运行温度为5℃时,高浓度和低流速甲醇溶液可获得较高的比功率;在本实验范围内,电池性能在氧气流速为100mL/min时达到最佳。

The effects of operation parameters including methanol concentration, the flow rate of methanol solution and oxygen on the performance of a home-made direct methanol fuel cell （DMFC） with an active area of 4.41 cm2 at 5 ℃ were analyzed. The results show that the cell performance deteriorated with the decrease of operating temperatures. In addition, it is found that the effects of operating parameters on the cell performance at low temperature are different from that at a temperature higher than room temperature. At the operating temperature of 5 ℃, a higher power density can be obtained with a higher methanol concentration and a lower flow rate of methanol solution. The optimum cell performance is achieved at the oxygen flow rate of 100 mL/min in this study.