Oxygen evolution reaction (OER) is an important bottleneck for large-scale acidic water splitting applications due to its sluggish reaction kinetics. Therefore, the development of highly active, stable, and inexpensive electrocatalysts for OER remains a challenge. Herein, we develop the iridium doped Co₃O₄ (Ir–Co₃O₄) with low Ir content of 2.88 wt% for efficient acidic OER. Considering systemic characterizations, it is probably concluded that Ir can be uniformly doped into the lattice of Co₃O₄ and induce a certain distortion. The electrochemical results reveal that Ir–Co₃O₄ nanoparticles demonstrate significantly enhanced electrocatalytic OER activity and stability in 0.5 M H₂SO₄ solution compared with pure Co₃O₄, in which the overpotential at the current density of 10 mA cm⁻² decreases from 382 mV to 225 mV and the value of Tafel slope decreases from 101.7 mV dec⁻¹ to 64.1 mV dec⁻¹. Besides, Ir–Co₃O₄ exhibits excellent electrocatalytic durability for continuous 130 h's test without any activity attenuation. Moreover, this work provides a kind of high-performance acidic OER electrocatalyst for the development of hydrogen energy.

由于反应动力学缓慢，析氧反应(OER) 是大规模酸性水分解应用的重要瓶颈。因此，开发高活性、稳定且廉价的 OER 电催化剂仍然是一个挑战。在此，我们开发了Ir 含量低至 2.88 wt% 的铱掺杂 Co ₃ O ₄ (Ir–Co ₃ O _{4 )，用于高效的酸性 OER。}考虑到系统表征，可以得出结论，Ir 可以均匀掺杂到 Co ₃ O ₄的晶格中并引起一定的畸变。电化学结果表明，Ir–Co ₃ O ₄与纯 Co ₃ O _4相比，纳米粒子在 0.5 M H ₂ SO ₄溶液中表现出显着增强的电催化 OER 活性和稳定性，其中在 10 mA cm ^-2电流密度下的过电势从 382 mV 降低到 225 mV，Tafel 值斜率从 101.7 mV dec ^-1降低到 64.1 mV dec ^-1。此外，Ir–Co ₃ O ₄表现出优异的电催化耐久性，连续130小时的测试没有任何活性衰减。此外，这项工作为氢能的发展提供了一种高性能的酸性OER电催化剂。