Metal borides have been acknowledged as promising candidates for alkaline oxygen evolution reaction (OER). Here, amorphous ternary metal borides (Ni-Ce-B) with different molar ratios of Ce% are achieved by a facile wet chemical method. With the optimal 5% of Ce, the as-prepared Ni-Ce-B-5/NF electrode exhibits comparable OER performance with lower overpotential (240 mV) than that of pure Ni-B/NF electrode (330 mV) and other metal borides. The high activity of Ni-Ce-B/NF is attributed to the amorphous structure and synergistic effect of binary metal Ni and Ce in Ni-Ce-B materials. Additionally, CeO_2-x forms and serves as an electron acceptor during the self-electrooxidation process, facilitating the formation of crystalline high-valence nickel species, resulting in robust electrocatalysis and long-term stability. This work presents a Ce-based metal boride as a promising candidate for the low-cost and highly efficient OER catalyst.

金属硼化物已被公认为碱性析氧反应 (OER) 的有希望的候选者。在这里，具有不同 Ce% 摩尔比的无定形三元金属硼化物 (Ni-Ce-B) 是通过简便的湿化学方法获得的。在最佳的 5% 的 Ce 下，所制备的 Ni-Ce-B-5/NF 电极表现出与纯 Ni-B/NF 电极（330 mV）和其他金属相比更低的过电位（240 mV）的 OER 性能硼化物。Ni-Ce-B/NF 的高活性归因于 Ni-Ce-B 材料中二元金属 Ni 和 Ce 的无定形结构和协同作用。此外，CeO _2-x在自电氧化过程中形成并充当电子受体，促进结晶高价镍物种的形成，从而实现强大的电催化和长期稳定性。这项工作提出了一种基于 Ce 的金属硼化物作为低成本和高效 OER 催化剂的有希望的候选者。