High-sensitive measurement and transport control of water in porous electrode of fuel cell using fiber-optic cavity ring-down laser spectroscopy

本研究利用光纤腔衰荡(CRD)光谱技术，研制了高时间分辨率、高灵敏度的燃料电池水蒸气激光定量测量系统。此外，运行中的聚合物电解质燃料电池(PEFC)中产生的水蒸气的浓度也按照这种环型CRD光谱分析系统进行了监测。研究发现，随着电流密度的增大，阴极废气中的水蒸气浓度增加。

In this study, the laser spectroscopy system for high time-resolution and high-sensitive quantitative measurement of water vapor in fuel cell was developed using fiber-optic cavity ring-down(CRD) spectroscopy. Furthermore, the concentration of water vapor generated in an operating polymer electrolyte fuel cell(PEFC) was monitored in line with this loop-type CRD spectroscopy system. It was found that the water vapor concentration in the cathode exhaust gas increases with an increase in current density