Neutron imaging technique for in situ measurement of water transport gradients within Nafion in polymer electrolyte fuel cells
Neutron imaging technique for in situ measurement of water transport gradients within Nafion in polymer electrolyte fuel cells
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DOI：
10.1149/1.1391727
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发表时间：
1999-03-01
影响因子：
3.9
通讯作者：
Jacobson, D
中科院分区：
文献类型：
--
作者：
Bellows, RJ;Lin, MY;Jacobson, D
水的传输是聚合物电解质燃料电池(PEFC)性能优化中的一个重要考虑因素，它同时影响内阻和阴极极化损耗。描述了使用中子照相术在运行中的PEFC中测量Nafion(R)内的水梯度分布的新颖实验。初步的中子强度梯度与膜水含量对原料气增湿和燃料电池电流变化的预期响应定性一致。以前对类似水梯度的实验测量通常依赖于诸如交流阻抗谱之类的“积分”测量，这种测量不能探测膜内梯度的细节。这是在Nafion内部对水梯度进行的第一次“差分”测量之一。(C)1999年电化学会。S0013-4651(98)10-004-6。版权所有。
Water transport is an important consideration in the optimization of polymer electrolyte fuel cell (PEFC) performance, affecting both internal resistance and cathode polarization losses. Novel experiments are described using neutron radiography to measure water gradient profiles within Nafion(R) in an operating PEFC. Preliminary neutron intensity gradients show qualitative agreement with the expected response of membrane water content to changes in feed gas humidification and fuel cell current. Previous experimental measurements of similar water gradients have generally relied on "integral" measurements such as ac impedance spectroscopy which cannot probe details of the gradient within the membrane. This is one of the first "differential" measurements of water gradients within Nafion. (C) 1999 The Electrochemical Society. S0013-4651(98)10-004-6. All rights reserved.