Paradox phenomena of proton exchange membrane fuel cells operating under dead-end anode mode
Paradox phenomena of proton exchange membrane fuel cells operating under dead-end anode mode
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DOI：
10.1016/j.jpowsour.2014.04.086
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发表时间：
2014-11-01
影响因子：
9.2
通讯作者：
Varcoe, John R.
中科院分区：
文献类型：
--
作者：
Jiang, Dong;Zeng, Rong;Varcoe, John R.
通过在单电池质子交换膜燃料电池(PEMFC)中使用两个空间分离的参比电极，在实际操作条件下记录了阳极和阴极的单独电位。PEMFC工作在死端阳极(DEA)模式下，没有任何加湿，以减少阳极上的积水。虽然N-2从阴极到阳极的交叉可能在质子交换膜燃料电池DEA模式下的运行中起到重要作用，但我们的结果出人意料地表明，阳极和阴极的过电位同时增加或减少。过电位的增加与电池高频电阻(R-HF)的增加相关，这意味着膜电极组件中的水含量是关键的。然而，随后的氢耗尽测试表明，水可能会积聚在催化剂表面和超薄的全氟磺酸(PFSA)离聚体薄膜之间的界面上，这与上述情况相矛盾(R-HF的增加意味着MEAs的干燥)。这项研究强调了进一步研究超薄全氟辛烷磺酸离聚体薄膜(
By using two spatially separated reference electrodes in a single cell proton-exchange membrane fuel cell (PEMFC), the individual potentials of the anode and cathode are recorded under realistic operating conditions. The PEMFC is operated under dead-end anode (DEA) mode, without any humidification, to mitigate water accumulation at the anode. Although N-2 crossover from cathode to anode may play an important role in PEMFCs operating under DEA mode, our results unexpectedly show that the over-potentials of both the anode and cathode concomitantly increased or decreased at the same time. The increases of over-potentials correlate to the increase of the high frequency resistance of the cell (R-hf) imply that the water content in the membrane electrode assemblies is critical. However, the subsequent H-2 depletion tests suggest that water may accumulate at the interface between the surface of the catalyst and the ultrathin perfluorosulfonic acid (PFSA) ionomer film and this contradicts the above (the increase in R-hf implies the drying out of the MEAs). This study highlights the need for further research into understanding the water transport properties of the ultrathin PFSA ionomer film (