Water transport coefficient distribution through the membrane in a polymer electrolyte fuel cell
Water transport coefficient distribution through the membrane in a polymer electrolyte fuel cell
复制标题
聚合物电解质燃料电池中穿过膜的水传输系数分布
DOI：
10.1016/j.memsci.2006.10.030
复制
发表时间：
2007
影响因子：
9.5
通讯作者：
Chaoyang Wang
中科院分区：
文献类型：
--
作者：
Fuqiang Liu;G. Lu;Chaoyang Wang
The net water transport coefficient through the membrane, defined as the ratio of the net water flux from the anode to cathode to the protonic flux, is used as a quantitative measure of water management in a polymer electrolyte fuel cell (PEFC). In this paper we report on experimental measurements of the net water transport coefficient distribution for the first time. This is accomplished by making simultaneous current and species distribution measurements along the flow channel of an instrumented PEFC via a multi-channel potentiostat and two micro gas chromatographs. The net water transport coefficient profile along the flow channels is then determined by a control-volume analysis under various anode and cathode inlet relative humidity (RH) at 80°C and 2atm. It is found that the local current density is dominated by the membrane hydration and that the gas RH has a large effect on water transport through the membrane. Very small or negative water transport coefficients are obtained, indicating strong water back diffusion through the 30μm Gore-Select®membrane used in this study.
