Proton exchange membrane (PEM) water electrolysis shows advantages including high current density, high efficiency, and compact configuration but suffers from the scarcity and high price of iridium (Ir)-based anodic catalysts. Herein, insoluble niobium (Nb)-incorporated RuO₂ with a high valence state was designed as an Ir-free catalyst for active and stable acidic oxygen evolution reaction (OER). Nb_0.1Ru_0.9O₂ exhibited a low overpotential (204 mV) and superb stability with an ultralow degradation rate (25 μV/h) over a 360-h durability test at 200 mA cm⁻², which is only 1/100th of the decay rates of other Ru-based catalysts measured at 10 mA cm⁻². The PEM electrolyzer with Nb_0.1Ru_0.9O₂ as an anode survived from a 100-h operation at 300 mA cm⁻². The strengthened adsorption of oxygen intermediates to active Ru sites reduced the OER energy barrier, while the enhanced electron transfer to Ru by Nb doping and formation of Nb⁵⁺ during the OER process extended catalyst’s durability.

质子交换膜 (PEM) 水电解具有电流密度高、效率高和结构紧凑等优点，但受到铱 (Ir) 基阳极催化剂稀缺和价格高的困扰。在此，将具有高价态的不溶性铌 (Nb) 结合的 RuO _{2设计为一种无 Ir 催化剂，用于活性和稳定的酸性析氧反应 (OER)。}Nb _0.1 Ru _0.9 O _{2在 200 mA cm} ⁻²下进行 360 小时耐久性测试后，表现出低过电位 (204 mV) 和超低降解率 (25 μV/h) 的极佳稳定性，仅是常规材料的1/100在 10 mA cm ^-2下测得的其他 Ru 基催化剂的衰减率。含铌的 PEM 电解槽_0.1 Ru _0.9 O _{2作为阳极在 300 mA cm} ^-2下运行 100 小时后仍然存在。氧中间体对活性 Ru 位点的增强吸附降低了 OER 能垒，而在 OER 过程中通过 Nb 掺杂和 Nb ⁵⁺的形成增强了电子向 Ru 的转移，从而延长了催化剂的耐久性。