物理化学学报 >> 2026, Vol. 42 >> Issue (11): 100381.doi: 10.1016/j.actphy.2026.100381

论文 上一篇    

可放大电沉积的MoNi4合金/非晶NiMoOx电极用于稳定碱性海水析氢

史雅然1, 马颖2, 李黎明2, 张安然2, 王舟舟3, 余颖1   

  1. 1 华中师范大学物理科学与技术学院纳米科学与纳米技术研究所, 湖北 武汉 430079;
    2 中船(邯郸)派瑞氢能科技有限公司, 河北 邯郸 057551;
    3 海氢科技(武汉)有限公司, 湖北 武汉 430223
  • 收稿日期:2026-06-29 修回日期:2026-07-31 录用日期:2026-08-01 发布日期:2026-09-29
  • 通讯作者: 王舟舟, 余颖 E-mail:wzzphysics@163.com;yuying01@ccnu.edu.cn
  • 基金资助:
    我们感谢国家重点研发计划(2026YFE0199500);国家自然科学基金(52472205)以及华中师范大学自主科研基金(教育部高校基本科研业务费,CCNU26ZH014)的资助。

Scalable electrodeposited MoNi4 alloy/amorphous NiMoOx electrodes for stable alkaline seawater hydrogen evolution

Yaran Shi1, Ying Ma2, Liming Li2, Anran Zhang2, Zhouzhou Wang3, Ying Yu1   

  1. 1 Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, Hubei Province, China;
    2 PERIC Hydrogen Technologies Co., Ltd., Handan 057551, Hebei Province, China;
    3 Hyper Hydrogen (Wuhan) Technology Co., Ltd., Wuhan 430223, Hubei Province, China
  • Received:2026-06-29 Revised:2026-07-31 Accepted:2026-08-01 Published:2026-09-29
  • Contact: Zhouzhou Wang, Ying Yu E-mail:wzzphysics@163.com;yuying01@ccnu.edu.cn

摘要: 在碱性析氢反应(HER)中,Volmer步骤(H2O + e- → H* + OH-)的缓慢动力学以及海水中的腐蚀性氯离子,对高效海水电解构成了双重挑战。本文通过一步电沉积法合成了MoNi4合金/非晶态NiMoOx(MoNi4/NiMoOx)催化剂,在10 mA cm-2下仅需28 mV的过电位,并在碱性天然海水中于500 mA cm-2下稳定运行800 h。该电极可放大至15 cm×15 cm,其切割片(110 cm2)在工业电解槽中于2 A cm-2下稳定工作750 h。X射线光电子能谱(XPS)和X射线吸收精细结构(XAFS)分析表明,MoNi4/NiMoOx通过从MoNi4到NiMoOx的电子转移,生成了富含电子的低价Niδ+(0 < δ < 1)物种。原位拉曼光谱、Bode相分析和局部pH测量证明,MoNi4/NiMoOx中的这种界面电子效应通过促进界面水分解加速了Volmer决速步骤,并维持了热力学上更有利于HER的较低局部pH值。理论计算显示,MoNi4/NiMoOx的d带中心更接近费米能级,提供了更强的H*吸附,近乎热中性的Volmer解离步骤以及固有的Cl-排斥作用,从而实现了在海水中的良好稳定性。该策略为直接海水电解提供了一条简单且可放大的高性能非贵金属催化剂制备途径。

关键词: MoNi4/NiMoOx, 碱性海水电解, 析氢反应, Volmer步骤

Abstract: The sluggish kinetics of the Volmer step (H2O + e- → H* + OH-) in alkaline hydrogen evolution reaction (HER) and the corrosive chloride ions in seawater pose dual challenges for efficient seawater electrolysis. Here a MoNi4 alloy/amorphous NiMoOx (MoNi4/NiMoOx) catalyst is synthesized by one-step electrodeposition, delivering an overpotential of only 28 mV at 10 mA cm-2 and stably running at 500 mA cm-2 in alkaline natural seawater for 800 h. The electrode can be scaled up to 15 cm×15 cm, and a cut piece (110 cm2) works stably in an industrial electrolyzer at 2 A cm-2 for 750 h. X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) reveal that MoNi4/NiMoOx generates electron-rich low-valent Nid+ (0 < d < 1) species through electron transfer from MoNi4 to NiMoOx. In situ Raman spectroscopy, bode phase analysis, and local pH measurements demonstrate that this interfacial electronic effect in MoNi4/NiMoOx accelerates the Volmer rate-determining step by facilitating interfacial water dissociation, and maintains a lower local pH that is thermodynamically more favorable for HER. Theoretical calculations show that MoNi4/NiMoOx possesses a d-band center shifted closer to the Fermi level, which provides stronger H* adsorption, a nearly thermoneutral Volmer dissociation step, and intrinsic Cl- repulsion, leading to the good stability in seawater. This strategy provides a simple and scalable route to high-performance non-noble metal catalysts for direct seawater electrolysis.

Key words: MoNi4/NiMoOx, Alkaline seawater electrolysis, Hydrogen evolution reaction, Volmer step