Evaluation of Dry-Wet Transition in PEFC under Load Changes Based on Laser Spectroscopy Using Fiber-Optic Probe
Evaluation of Dry-Wet Transition in PEFC under Load Changes Based on Laser Spectroscopy Using Fiber-Optic Probe
复制标题
基于光纤探针激光光谱法评估负载变化下 PEFC 的干湿转变
DOI：
10.1149/09208.0119ecst
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
M. Kawasaki
中科院分区：
文献类型：
--
作者：
K. Nishida;R. Nakauchi;Y. Tabata;T. Umekawa;M. Kawasaki
为了避免聚合物电解质燃料电池（PEFC）在低湿度条件下出现膜干燥和性能下降，有必要了解工作电池内的动态水传输。在这项研究中，我们开发了一种基于可调谐二极管激光吸收光谱（TDLAS）的带有单端光纤探头的实时气体传感系统，以高精度和高时间分辨率测量燃料电池狭窄通道中的水蒸气分布。该传感器用于评估低湿度和负载变化运行期间 PEFC 阳极流道中的干湿瞬态现象。该技术表明，当电流密度增加并发生电压下冲时，阳极通道中的水蒸气浓度会出现较大的暂时下降。我们得出的结论是，基于 TDLAS 的气体传感技术能够检测电流密度阶跃变化后观察到的流道中水浓度的瞬时波动。
To avoid the membrane dryout and performance degradation of polymer electrolyte fuel cells (PEFCs) under low-humidity conditions, it is necessary to understand the dynamic water transport within working cells. In this study, we have developed a real-time gas sensing system with a single-ended fiber-optic probe based on tunable diode laser absorption spectroscopy (TDLAS), to measure the water vapor distribution in narrow channels of fuel cells with high accuracy and high temporal resolution. This sensor was used to evaluate the dry-wet transient phenomena in the anode flow channel of a PEFC during low-humidity and load change operations. The technique showed the water vapor concentration in the anode channel has a large temporary drop when the current density increases and the voltage undershoot occurs. We concluded that the TDLAS-based gas sensing technique enables the detection of instantaneous fluctuations of water concentration in the flow channel observed after step changes of current density.