Temperature dependence of the water distribution inside a Nafion membrane in an operating polymer electrolyte fuel cell. A micro-Raman study
Temperature dependence of the water distribution inside a Nafion membrane in an operating polymer electrolyte fuel cell. A micro-Raman study
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DOI：
10.1016/j.electacta.2011.09.067
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发表时间：
2011-12-30
影响因子：
6.6
通讯作者：
Watanabe, Masahiro
中科院分区：
文献类型：
--
作者：
Hara, Masanori;Inukai, Junji;Watanabe, Masahiro
采用原位共聚焦微拉曼光谱技术对聚合物电解质燃料电池（PEFC）在不同温度（40-110℃）和湿度（干燥90% RH）下的电解质膜内部进行了探测。在潮湿和干燥条件下，除磺酸基团外，聚合物中涉及的官能团的拉曼光谱没有变化。随着相对湿度的增加，S-O拉伸带强度（nu(S-O)）增大，峰值向低波数偏移。通过分析拉曼峰，成功地评估了运行PEFC中通过Nafion膜厚度的水分布。结果表明，水在阴极向阳极反向扩散，使膜湿化，且膜中水的输运速率随细胞温度的升高而增加。(C) 2011 Elsevier Ltd.版权所有。
In situ confocal micro-Raman spectroscopy was used to probe the interior of the electrolyte membrane of a polymer electrolyte fuel cell (PEFC) at various temperatures (40-110 degrees C) and humidities (dry-90% RH). No changes in the Raman spectra for functional groups involved in the polymer were found under humidified and dry conditions, except for the sulfonic acid group. With increasing relative humidity, the band intensity for S-O stretching (nu(S-O)) in the latter increased, and the peak shifted toward lower wavenumber. By analyzing the Raman peaks, water distributions through the Nafion membrane thickness were successfully evaluated in the operating PEFC. It was found that the back-diffusion of water produced at the cathode to the anode, humidifying the membrane, was clearly detectable, and also the rate of water transport in the membrane increased with increasing cell temperature. (C) 2011 Elsevier Ltd. All rights reserved.