Spinel type oxides including CoMoO₄ are promising catalysts for water electrolysis. However, MoO₄²⁻ is easy to dissolve during oxygen evolution reaction (OER), resulting in the poor performance. The lattice modulation of CoMoO₄ may be an effective strategy for better activity and stability. In our work, molten salt method has been adopted to realize the incorporation of Ag into the lattice surface of CoMoO₄ nanorods. The physical characterizations show that Ag is uniformly distributed in the surface lattice of optimized Co_1−xAg_xMoO₄. Lattice Ag doping stabilizes the structure of Co_1−xAg_xMoO₄ by adjusting the electron distribution state to form a high-valence Co. Moreover, the incorporation of low-valence Ag⁺ causes the Co_1−xAg_xMoO₄ to produce more oxygen vacancies, which reduces the charge transfer resistance by about 15 times compared to CoMoO₄. The electrochemical measurements demonstrate that Co_1−xAg_xMoO₄ exhibits a lower OER overpotential (330 mV) at 10 mA cm⁻² and the 2.7 longer time than CoMoO₄ during chronopotentiometry test. DFT calculation reveals that Ag doping with ion polarization optimizes the electron distribution of Co-O and enhances the covalency of Mo-O to slow down the solubility of Co_1−xAg_xMoO₄. This work shows that lattice doping of metal ions may be a great choice for excellent electrocatalysts for OER.

包括CoMoO ₄在内的尖晶石型氧化物是很有前途的水电解催化剂。然而，MoO ₄ ²⁻在析氧反应（OER）过程中容易溶解，导致性能较差。CoMoO ₄的晶格调制可能是提高活性和稳定性的有效策略。在我们的工作中，采用熔盐法实现了将Ag掺入CoMoO ₄纳米棒的晶格表面。物理表征表明，Ag 均匀分布在优化的 Co _1−x Ag _x MoO ₄的表面晶格中。晶格 Ag 掺杂稳定了 Co _1−x Ag _x MoO的结构₄通过调整电子分布状态形成高价Co。此外，低价Ag ⁺的掺入使Co _1−x Ag _x MoO ₄产生更多的氧空位，使电荷转移电阻降低约15与 CoMoO ₄相比。电化学测量表明，Co _1−x Ag _x MoO ₄在 10 mA cm ^{-2下表现出较低的 OER 过电势 (330 mV)，并且比 CoMoO} ₄的时间长 2.7在计时电位测试期间。DFT 计算表明，离子极化的 Ag 掺杂优化了 Co-O 的电子分布并增强了 Mo-O 的共价性，从而减缓了 Co _1−x Ag _x MoO ₄的溶解度。这项工作表明，金属离子的晶格掺杂可能是优秀的 OER 电催化剂的一个很好的选择。