Improvement of the proton exchange membrane fuel cell (PEMFC) performance at low-humidity conditions by exposing anode in Ultraviolet light
Improvement of the proton exchange membrane fuel cell (PEMFC) performance at low-humidity conditions by exposing anode in Ultraviolet light
复制标题
通过将阳极暴露在紫外线下提高质子交换膜燃料电池 (PEMFC) 在低湿度条件下的性能
DOI：
10.1016/j.elecom.2014.03.022
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发表时间：
2014-07-01
影响因子：
5.4
通讯作者：
Yi, Baolian
中科院分区：
文献类型：
--
作者：
Guo, Xiaoqian;Shao, Zhigang;Yi, Baolian
膜和催化剂层的充分水化通常需要外部的水化系统，但它一直被认为是PEMFC的一个障碍。以光敏吸湿材料二氧化钛（TiO2）为阳极材料，采用紫外光作为外界刺激，提高阳极的润湿性。在紫外光照射下，水吸附在TiO2的光致氧缺陷上，转化为表面羟基。羟基的生成促进了背扩散，降低了充电电阻，改善了电池在低湿环境下的性能。该方法避免了引入过多吸湿材料的问题。(C)2014爱思唯尔有限公司版权所有。
External humidifying system is generally needed for the fully hydration of membrane and catalyst layer, but it is considered as a barrier to PEMFC all the time. In this study, ultraviolet (UV) light was served as external stimulus to increase the wettability of anode which consists of photo-sensitive hygroscopic materials titanium oxide (TiO2). Under UV irradiation, water adsorbed on the photo-induced oxygen defects of TiO2 and transformed into surface hydroxyl groups. The generated hydroxyl groups furthered the back diffusion and decreased the charge resistance, which improved the performance at the low-humidity condition. The problems on the introduction of excessive hygroscopic materials are avoided by the new method. (C) 2014 Elsevier B.V. All rights reserved.