Due to its poor electrical conductivity and finite exposed active sites, the development of high activity Co₃O₄ oxygen evolution reaction (OER) electrocatalysts remains a major challenge. Oxygen vacancies can enhance the electrical conductivity of electrocatalysts and reduce the adsorption energy of H₂O molecules on surfaces, thereby significantly enhancing their electrocatalytic activity. Taking inspiration from this, we demonstrate a green and facile reduction strategy to prepare reduced Co₃O₄ nanosheet arrays (R-Co₃O₄ NSA) with large electrochemical surface area and rich in surface oxygen vacancies. Compared to pristine Co₃O₄ nanosheet arrays (P-Co₃O₄ NSA), R-Co₃O₄ NSA exhibits better OER performance, with a lower overpotential of 330 mV at a current density of 20 mA cm⁻² and a smaller Tafel slope of 72 mV dec⁻¹. Impressively, the excellent properties of R-Co₃O₄ NSA can rival to the state-of-the-art noble metal oxide electrocatalyst (IrO₂). This strategy of defect-engineering offers a briefness and cost-effective means for the development of highly efficient OER systems.

由于其差的电导率和有限的暴露的活性位点，高活性Co ₃ O ₄析氧反应（OER）电催化剂的开发仍然是一个主要挑战。氧空位可增强电催化剂的电导率并降低H ₂ O分子在表面上的吸附能，从而显着增强其电催化活性。从中得到启发，我们演示了一种绿色且简便的还原策略，以制备具有大电化学表面积和丰富表面氧空位的还原Co ₃ O ₄纳米片阵列（R-Co ₃ O ₄ NSA）。与原始Co ₃ O相比_4个纳米片阵列（P-Co ₃ O ₄ NSA），R-Co ₃ O ₄ NSA表现出更好的OER性能，在20 mA cm ^-2的电流密度下，较低的过电势为330 mV，而塔菲尔斜率较小，为72 mV dec ^-1。令人印象深刻的是，R-Co ₃ O ₄ NSA的优异性能可以与最新的贵金属氧化物电催化剂（IrO ₂）相媲美。这种缺陷工程策略为开发高效的OER系统提供了一种简短且具有成本效益的方法。