质子交换膜燃料电池电流分布测定

目前大功率燃料电池研究中存在的主要问题是电池在放大过程中性能出现大幅度衰减。研究质子交换膜燃料电池电流密度分布 ,是解决其电池放大过程中性能衰减的基础 ,对提高燃料电池的比功率 ,加速其商业化进程具有重要意义。采用子电池方法 (SubcellApproach)对质子交换膜燃料电池电流分布进行了测定 ,采用网状流场 ,面积为 13 0cm2 。分别考察了气体压力、气体流量、电池温度及不同放电电流密度等条件对电池电流分布的影响。实验结果表明 ,采用网状流场电流密度分布并不均匀。分析了网状流场内流体、水分布情况 ,提出了一种网状流场新的流型。这种方法还可以应用于蛇型流场及其他流场电流分布的测定

Measurement of current distribution in proton exchange membrane fuel cell

The present main problem of scaling up proton exchange membrane fuel cell (PEMFC) to commercial dimension is the performance fading. The study on current distribution in PEMFC is the foundation of solving the performance fading problem during the magnification of single cell. The Subcell Approach was adopted to measure current distribution in PEMFC with 130 cm 2 metal mesh flow field. The effects of operation conditions, such as temperature, pressure and flow rate, on current distribution were discussed. The experimental results show that the current distribution in PEMFC with metal mesh flow field is not homogeneous. The real time cu rrent distribution data under steady state, which is contributing to an innovated understanding of water management and reactant distribution over the metal mesh flow field, was presented. The method can be applied to measure current distribution in PEMFC with various flow field, including serpentine type flow field.