Investigation on cathode degradation of direct methanol fuel cell
Investigation on cathode degradation of direct methanol fuel cell
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DOI：
10.1016/j.electacta.2009.05.085
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发表时间：
2009-11-01
影响因子：
6.6
通讯作者：
Cai, Ke-Di
中科院分区：
文献类型：
--
作者：
Liu, Peng;Yin, Ge-Ping;Cai, Ke-Di
研究了直接甲醇燃料电池（DMFC）在80℃下间断电稳态运行240 h后的阴极降解。为了隔离电化学和质量传递过程，不将催化剂涂覆膜（CCM）和阴极扩散层结合。EDS和SEM测试表明，阴极电化学表面积（ESA）的损失与Pt/C催化剂的衰减和界面接触有关。阳极失效导致的Ru交叉和较高的甲醇交叉加剧了阴极的降解。另一方面，孔隙结构的改变导致阴极微孔层的润湿性提高。因此，由于疏水通道的减少，氧的运输受到抑制。2009爱思唯尔有限公司版权所有。
The cathode degradation of a direct methanol fuel cell (DMFC) was investigated after a 240 h discontinuous galvostatic operation at 80 degrees C. The catalyst coated membrane (CCM) and the cathode diffusion layer were not combined so as to isolate electrochemical and mass transport processes. It was indicated by the EDS and SEM tests that the loss of the cathode electrochemical surface area (ESA) was associated with the decays of the Pt/C catalyst and the interfacial contact. Furthermore, Ru crossover and higher methanol crossover resulting from the anode failure aggravated the degradation of the cathode. On the other hand, the change of the pore structure led to a higher wettability of the cathode microporous layer. Therefore, the oxygen transport was suppressed due to the decrease of hydrophobic passages. (C) 2009 Elsevier Ltd. All rights reserved.