Efficient Alkaline Freshwater/Seawater Hydrogen Production via Heterogeneous N‐Doped FeMoO<sub>4</sub>/Mo<sub>2</sub>N Rod‐Shaped Electrocatalysts
Yanxiang He, Meilian Tu, Weijiang Gan, Zhixiao Zhu, Muhammad Mushtaq, Mohammad Al‐Mamun, Jianqiu Deng, Hao Yang, Zhongmin Wang, Muhammad‐Sadeeq Balogun
Abstract
Abstract Durable and efficient Fe‐based electrocatalysts in alkaline freshwater/seawater electrolysis is highly desirable but persists a significant challenge. Herein, we report a durable and robust heterogenous nitrogen‐doped FeMoO 4 /Mo 2 N rod‐shaped catalyst on nickel foam (denoted NF@FMO/MN) affording hydrogen evolution reaction (HER) low overpotentials of 23/29 mV@10 mA cm −2 and 112/159 mV@100 mA cm −2 in both alkaline freshwater/seawater electrolytes, respectively. These results are significantly superior to the pristine FeMoO 4 catalyst. Theoretical calculations consistently reveals that the combination of N‐FeMoO 4 and Mo 2 N effectively reduces water activation energy barrier, modulates the sluggish water‐dissociation kinetics and accelerates the hydrogen adsorption process for efficient HER. The enhanced HER performance of the as‐designed NF@FMO/MN catalyst is attributed to the in situ hetero‐interfacial engineering between N‐doped FeMoO 4 and Mo 2 N. This present work nurtures the progress of FeMo‐based electrocatalysts in alkaline freshwater/seawater electrolysis.