The distribution and diffusion coefficient of water inside a Nafion® membrane in a running fuel cell under transient conditions analyzed by operando time-resolved CARS spectroscopy

IF 5.4 Q2 CHEMISTRY, PHYSICAL
Hiromichi Nishiyama Dr. Ph.D. , Akihiro Iiyama Prof. Ph.D. , Junji Inukai Prof. Ph.D.
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引用次数: 3

Abstract

The performance and stability of polymer electrolyte membrane fuel cells (PEMFCs) are directly affected by the distribution of water molecules inside the membrane. In this study, coherent anti-Stokes Raman scattering (CARS) spectroscopy was used to measure the distribution of water in a Nafion® membrane under transient conditions after increasing the current density. At the cathodic surface of the membrane, an overshoot in amount of water was observed as a result of the increase in the rate of water production and electro-osmosis, while at the other locations in the membrane was observed a gradual increase of water as a result of water transport. The calculation of the water diffusion coefficient during power generation was subsequently carried out, which was consistent with the results of the previous values obtained statically.

Abstract Image

用时间分辨CARS光谱法分析了燃料电池运行过程中水在Nafion®膜内的分布和扩散系数
聚合物电解质膜燃料电池(pemfc)的性能和稳定性直接受到膜内水分子分布的影响。在本研究中,相干反斯托克斯拉曼散射(CARS)光谱测量了在瞬态条件下增加电流密度后,水在Nafion®膜中的分布。在膜的阴极表面,由于产水和电渗透速率的增加,观察到水量的过量,而在膜的其他位置,由于水的运输,观察到水的逐渐增加。随后进行了发电过程中水扩散系数的计算,结果与之前的静力计算结果一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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