The amorphous Co-Ce binary metal oxides Co_1-yCe_yO_x prepared by the photochemical metal–organic deposition (PMOD) method is developed as high performance electrocatalysts for oxygen evolution reaction (OER). The influence of Ce content on the OER activity is investigated in terms of geometric and electronic factors. Ce can remarkably enhance the OER activity of CoO_x due to the synergistic effect of surface area, Co³⁺ content, and metal-OH bond strength when the content of Ce is less than 60%. Co_0.9Ce_0.1O_x supported on fluorine-doped tin oxide (FTO) coated glass substrate shows overpotential of 320 (2) mV at 10 mA cm⁻² in 1 M KOH solution. The OER mechanism exploration reveals that the rate determining step changes with the Ce content due to the variation of metal-OH bond strength. This work sheds light on the design of high-performance yet cost-effective OER catalysts.

通过光化学金属-有机沉积（PMOD）方法制备的非晶态Co-Ce二元金属氧化物Co _1-y Ce _y O _x被开发为用于氧释放反应（OER）的高性能电催化剂。从几何和电子因素的角度研究了铈含量对OER活性的影响。当Ce的含量小于60％时，由于表面积，Co ³⁺含量和金属-OH键强度的协同作用，Ce可以显着增强CoO _x的OER活性。负载在掺氟氧化锡（FTO）的玻璃基板上的Co _0.9 Ce _0.1 O _x在10 mA cm ^-2时显示320（2）mV的过电势在1 M KOH溶液中。OER机制的探索表明，由于金属-OH键强度的变化，速率确定步骤随Ce的含量而变化。这项工作为高性能但具有成本效益的OER催化剂的设计提供了启示。