Liu Haorui, Zhou Qi, Duan Dedong
School of Materials Science and Engineering, Lanzhou University of Technology Lanzhou 730050 Gansu China.
School of Materials Engineering, Longdong University Qingyang 745000 Gansu China.
RSC Adv. 2025 Sep 26;15(43):35728-35738. doi: 10.1039/d5ra05179g.
In this study, a CoFeO/CoMoO composite electrode material with a spinel structure (CoFeO) and a scheelite structure (CoMoO) was prepared by a hydrothermal method. The rich valence states and its unique morphological and structural advantages made the CoFeO/CoMoO composite electrode material play a more effective synergistic catalytic role. Results of the electrochemical characterization showed that CoMoO was attached to the CoFeO skeleton structure in the composite electrode in a sheet form. At a current density of 50 mA cm, the hydrogen evolution overpotential was 193 mV and the respective Tafel slope was 100.44 mV dec, while the oxygen evolution overpotential was 319 mV and the corresponding Tafel slope was 70.47 mV dec. At the same time, the overall water decomposition voltage was 1.55 V at a current density of 10 mA cm, and the voltage changed only 11 mV for a 12 h continuous electrolysis, which suggested a good electrocatalytic water decomposition performance.
在本研究中，采用水热法制备了具有尖晶石结构（CoFeO）和白钨矿结构（CoMoO）的CoFeO/CoMoO复合电极材料。丰富的价态及其独特的形态和结构优势使CoFeO/CoMoO复合电极材料发挥了更有效的协同催化作用。电化学表征结果表明，CoMoO以片状形式附着在复合电极中的CoFeO骨架结构上。在电流密度为50 mA cm时，析氢过电位为193 mV，相应的塔菲尔斜率为100.44 mV dec，而析氧过电位为319 mV，相应的塔菲尔斜率为70.47 mV dec。同时，在电流密度为10 mA cm时，全水解电压为1.55 V，连续电解12 h时电压仅变化11 mV，这表明其具有良好的电催化水分解性能。
