Quantitative video-rate hydration imaging of Nafion proton exchange membranes with terahertz radiation
Quantitative video-rate hydration imaging of Nafion proton exchange membranes with terahertz radiation
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DOI：
10.1016/j.jpowsour.2019.227665
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发表时间：
2020-02-29
影响因子：
9.2
通讯作者：
Lin, H.
中科院分区：
文献类型：
--
作者：
Alves-Lima, D. F.;Letizia, R.;Lin, H.
Nafion膜被认为是质子交换膜燃料电池的工业标准电解质材料。这些膜需要足够的水合作用以达到高质子传导率。太赫兹辐射对液态水的相对高的灵敏度使得能够观察到对比度，用于检查Nafion电解质膜中的水存在。利用市售的太赫兹源和相机，本文研究了一个紧凑的太赫兹成像系统的可行性，用于可视化和量化液态水在环境空气解吸过程中的Nafion膜的厚度范围很广- NRE-212（50 μ m），N-115（127 μ m），N-117（180 μ m）和N-1110（254 μ m）。我们表明，太赫兹成像系统是能够量化的液态水在25-500 μ m的厚度范围内，估计膜重量变化有关的液态水解吸，这相关以及对同时重量分析和可视化的室温液态水解吸过程的部分水合的Nafion N-117膜。
Nafion membranes are considered as the industry standard electrolyte material for proton exchange membrane fuel cells. These membranes require adequate hydration in order to reach a high proton conductivity. The relatively high sensitivity of terahertz radiation to liquid water enables contrast to be observed for inspecting water presence in Nafion electrolyte membranes. Utilising a commercially available terahertz source and camera, this paper investigates the feasibility of a compact terahertz imaging system for visualising and quantifying liquid water during an ambient air desorption process for Nafion membranes of a wide range of thicknesses - NRE-212 (50 mu m), N-115 (127 mu m), N-117 (180 mu m) and N-1110 (254 mu m). We demonstrate that the terahertz imaging system is able to quantify liquid water in the 25-500 mu m thickness range, estimate membrane weight change related to liquid water desorption, which correlated well against simultaneous gravimetric analysis and visualise the room temperature liquid water desorption process of a partially hydrated Nafion N-117 membrane.