基于不同电极位置的PEMFC运行特性研究

质子交换膜燃料电池(PEMFC)是一种有巨大发展潜力的发电装置,特别适合成为新一代便携式电源和电动汽车的动力源。水是影响燃料电池性能的关键因素,良好的水管理是使其安全稳定运行和提高其性能的必要条件。在PEM燃料电池的阴极侧安装风扇,向燃料电池提供氧化剂和降低电池温度,通过实验,观察到在电池堆方向发生变化的情况下,PEM燃料电池性能及其内部传质情况会发生明显变化。实验结果发现:当电流密度较小时,电极方向对PEM燃料电池的性能影响不明显;当电流密度较大时,阳极在上、阴极在下时燃料电池性能优于阴极在上、阳极在下的燃料电池性能。

Study of performance of PEMFC stack in different electrode positions

Proton exchange membrane(PEM) fuel cell is an electrochemical generating device which has great potential of development,particularly suitable for a new generation of portable power and electric vehicle power source.Water is the key factor of affecting fuel cell performance.Water management plays an important role in PEM fuel cell for safe and steady operation.The stack uses an air fan in the edge of the cathode,combining high oxidant supply and stack cooling purposes.In this paper,the performance of a PEM fuel cell and mass transport was observed in different electrode relative position.The results show,the different electrode relative positions do not affect the performance of PEM fuel cell in low current density.When PEM fuel cell is placed anode-upward,gravity is advantageous to discharge the liquid water in PEM fuel cell cathode in high current density.