Shi Xiaoyun, Qiu Xutao, Yuan Zhuolin, Zhang Runcheng, Zhao Kun, Tan Aidong, Xu Guizhi, Song Jie, Liu Jianguo
Institute of Energy Power Innovation, North China Electric Power University, Beijing 102206, P. R. China.
Beijing Laboratory of New Energy Storage Technology, Beijing 102206, P. R. China.
ACS Appl Mater Interfaces. 2024 Dec 4;16(48):66089-66098. doi: 10.1021/acsami.4c13605. Epub 2024 Nov 22.
Green hydrogen production via PEM water electrolysis is challenged by fluctuating input power when coupled with renewable energy sources. This study investigates the effects of dynamic loading frequencies on membrane electrode assembly (MEA) performance and durability. We found that higher loading frequencies facilitate the growth of the oxide layer of Ti porous transport layer (Ti-PTL) due to increased duration in the voltage spike region. These thicker and coarser oxide layers directly induce cracks and delamination in the anodic catalyst layers by spontaneously adsorbing an ionomer. These changes negatively impact the interface contact quality and anodic electrochemical active area, ultimately reducing the performance of the MEA, with higher frequencies accelerating this degradation. Additionally, applying a Pt coating to PTL effectively mitigates these adverse effects. This work highlights the importance of dynamic loading studies and reveals that effective management of the Ti-PTL and catalyst/PTL interface is necessary to achieve long-term operational durability of PEM water electrolysis.
