Su Zhanhua, Liang Jing, Zhao Zhifeng, Guo Rui, Zhang Shiqi, Li Xiaofeng, Lin Shuangyan
College of Chemistry, Guangdong University of Petrochemical Technology, Maoming 525000, China.
College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, China.
Langmuir. 2025 Jul 15;41(27):18017-18027. doi: 10.1021/acs.langmuir.5c01885. Epub 2025 Jul 1.
Water electrolysis is a promising approach for hydrogen production. However, achieving cost-effective and durable electrocatalysts at large current densities for seawater splitting remains a significant challenge. This study synthesized a NiFeO/Fe-NiS/NiS heterostructure on nickel foam (NF) via a simple solvothermal method with varying reaction times. The NiFeO/Fe-NiS/NiS/NF-12h catalyst requires overpotentials of 398 mV for the hydrogen evolution reaction (HER) and 373 mV for the oxygen evolution reaction (OER) to achieve a current density of 1000 mA cm in an alkaline seawater medium. Notably, the NiFeO/Fe-NiS/NiS/NF-12h (+,-) electrolyzer achieved a cell voltage of 1.92 V at 500 mA cm and exhibited remarkable stability, maintaining its performance for more than 100 h at 500 mA cm in an alkaline seawater electrolyte. These findings highlight the critical role of the reaction time in optimizing the morphologies of catalysts. Meanwhile, the synergistic effect of iron doping and interface interaction enhanced the electrocatalytic activity of NiFeO/Fe-NiS/NiS. This work provides a practical strategy for designing high-performance electrocatalysts suitable for industrial-scale seawater electrolysis.
水电解是一种很有前景的制氢方法。然而，在大电流密度下实现具有成本效益且耐用的海水分解电催化剂仍然是一项重大挑战。本研究通过简单的溶剂热法，在不同反应时间下，在泡沫镍（NF）上合成了NiFeO/Fe-NiS/NiS异质结构。在碱性海水介质中，NiFeO/Fe-NiS/NiS/NF-12h催化剂在析氢反应（HER）中达到1000 mA cm的电流密度需要398 mV的过电位，在析氧反应（OER）中需要373 mV的过电位。值得注意的是，NiFeO/Fe-NiS/NiS/NF-12h（+，-）电解槽在500 mA cm下的电池电压为1.92 V，并表现出显著的稳定性，在碱性海水电解质中，在500 mA cm下保持其性能超过100小时。这些发现突出了反应时间在优化催化剂形貌方面的关键作用。同时，铁掺杂和界面相互作用的协同效应增强了NiFeO/Fe-NiS/NiS的电催化活性。这项工作为设计适用于工业规模海水电解的高性能电催化剂提供了一种实用策略。
