Tian Fenyang, Geng Shuo, Li Menggang, Qiu Longyu, Wu Fengyu, He Lin, Sheng Jie, Zhou Xin, Chen Zhaoyu, Luo Mingchuan, Liu Hu, Yu Yongsheng, Yang Weiwei, Guo Shaojun
State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, China.
Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou, 550025, China.
Adv Mater. 2025 May;37(18):e2501230. doi: 10.1002/adma.202501230. Epub 2025 Mar 21.
Ruthenium (Ru) is considered as a promising catalyst for the alkaline hydrogen evolution reaction (HER), yet its weak water adsorption ability hinders the water splitting efficiency. Herein, a concept of introducing the oxygenophilic MgO and MoO species onto amorphous Ru metallene is demonstrated through a simple one-pot salt-templating method for the synergic promotion of water adsorption and splitting to greatly enhance the alkaline HER electrocatalysis. The atomically thin MgO and MoO species on Ru metallene (MgO/MoO-Ru) show a 15.3-fold increase in mass activity for HER at the potential of 100 mV than that of Ru metallene and an ultralow overpotential of 8.5 mV at a current density of 10 mA cm. It is further demonstrated that the MgO/MoO-Ru-based anion exchange membrane water electrolyzer can achieve a high current density of 100 mA cm at a remarkably low cell voltage of 1.55 V, and exhibit excellent durability of over 60 h at a current density of 500 mA cm. In situ spectroscopy and theoretical simulations reveal that the co-introduction of MgO and MoO enhances interfacial water adsorption and splitting by promoting adsorption on oxidized Mg sites and lowering the dissociation energy barrier on oxidized Mo sites.
钌（Ru）被认为是一种有前景的碱性析氢反应（HER）催化剂，但其较弱的水吸附能力阻碍了水分解效率。在此，通过一种简单的一锅盐模板法，展示了在非晶态钌金属烯上引入亲氧性MgO和MoO物种的概念，以协同促进水的吸附和分解，从而极大地增强碱性HER电催化性能。钌金属烯上的原子级薄MgO和MoO物种（MgO/MoO-Ru）在100 mV电位下的HER质量活性比钌金属烯提高了15.3倍，在电流密度为10 mA cm时的过电位超低，为8.5 mV。进一步证明，基于MgO/MoO-Ru的阴离子交换膜水电解槽在1.55 V的极低电池电压下可实现100 mA cm的高电流密度，并且在500 mA cm的电流密度下表现出超过60小时的优异耐久性。原位光谱和理论模拟表明，MgO和MoO的共同引入通过促进在氧化Mg位点上的吸附并降低氧化Mo位点上的解离能垒，增强了界面水的吸附和分解。
