Electrocatalysts for oxygen evolution reaction (OER) have received substantial interests owing to its critical role in boosting water electrolysis for hydrogen production, and designing highly efficient and durable OER catalysts based on earth-abundant elements is of great importance in replacing noble metal-based catalysts. Herein, a facile reduction-induced surface reconstruction process was proposed for fabricating cobalt hydroxide/molybdenum oxide hybrid nanosheets with high porosity, rough surface and facile charge transport behavior. Benefitted from the structural merits, the highly porous α-Co(OH)₂/Mo₉O₂₆ hybrid nanosheets exhibit an ultralow overpotential of 279 mV for achieving a 10 mA cm^-2 current density and a high current density of 225.2 mA cm^-2 at 1.8 V vs. RHE. In addition, a remarkable normalized current density of 11.9 A F^-1 can be identified at η=400 mV, which is much larger than previously reported Co-based catalysts and even benchmarking RuO₂ and IrO₂. Moreover, for CoMoO-r displays stable OER activity towards long-term operation with no performance degradation but obvious enhancement even for 72 hours. The high OER activity combined with the excellent stability makes the hybrid catalyst a promising candidate for commercial water splitting.

氧释放反应（OER）的电催化剂在促进水电解制氢中起着至关重要的作用，因此受到了广泛的关注，设计基于稀土元素的高效耐用的OER催化剂对于替代贵金属基催化剂至关重要。 。在此，提出了一种容易还原诱导的表面重建工艺，用于制备具有高孔隙率，粗糙表面和容易的电荷传输行为的氢氧化钴/氧化钼杂化纳米片。得益于结构优点，高度多孔的α-Co（OH）₂ / Mo ₉ O ₂₆杂化纳米片表现出279 mV的超低超电势，可实现10 mA cm ^-2电流密度和1.8 V相对于RHE的225.2 mA cm ^-2的高电流密度。此外，在η= 400 mV时，可以确定11.9 AF ^-1的显着归一化电流密度，这比以前报道的Co基催化剂甚至基准RuO ₂和IrO ₂都大得多。而且，对于CoMoO-r，它在长期运行时显示出稳定的OER活性，即使在72小时内，性能也不会降低，但性能会明显提高。高OER活性和出色的稳定性使该杂化催化剂成为工业水分解的有前途的候选者。