Robust iron-doped nickel phosphides in membrane-electrode assembly for industrial water electrolysis

Jian Jie Ma, Yu Ting Chueh, Yi Yu Chen, Yung Hsi Hsu, Yu Chun Liu, Kang Shun Peng, Chih Wei Hu, Ying Rui Lu, Yu Cheng Shao, Shao Hui Hsu, Sung Fu Hung*

*此作品的通信作者

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

Water electrolysis, a pivotal process for the production of green hydrogen, is a crucial step toward realizing the hydrogen economy. To advance its industrialization, it is essential to develop a highly efficient and economical catalyst along with a low-resistance electrolyzers. In pursuit of this goal, we synthesize a cost-effective iron-doped nickel phosphide electrocatalyst through a hydrothermal synthesis followed by post-phosphorization process. This catalyst exhibits exceptional performance, with an overpotential at 10 mA cm-210) of 216 mV for oxygen evolution reaction, the rate-determining step for water electrolysis. It overperforms the that of pristine nickel phosphide (NiPx, η10 = 284 mV). Operando X-ray absorption spectroscopy reveals the robust nature of the iron-doped nickel phosphide catalyst during water electrolysis, in stark contrast to the pristine nickel phosphide, which undergoes oxidation, thereby impacting overall catalytic activity. When integrated into a membrane-electrode assembly (MEA) system, our iron-doped nickel phosphide displays voltages of 1.51 V at 10 mA cm-2 (EE = 81.5%) and 1.66 V at 100 mA cm-2 (EE = 76.4%) without iR-correction. Moreover, it achieves a current density of 345 mA cm-2 at an applied voltage of 2 V without iR-correction, meeting industrial criteria. These findings underscore the superior catalytic activity of the robust phosphide phase for water electrolysis.

原文English
文章編號144744
期刊Electrochimica Acta
500
DOIs
出版狀態Published - 1 10月 2024

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