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
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
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DOI：
10.1016/j.powera.2021.100080
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发表时间：
2022-01-01
影响因子：
4.5
通讯作者：
Inukai, Junji
中科院分区：
文献类型：
--
作者：
Nishiyama, Hiromichi;Iiyama, Akihiro;Inukai, Junji
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，利用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 (R)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。
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 (R) 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.