The stability of supported Ir-based catalysts in acid oxygen evolution reaction (OER) remains a pressing challenge, which hinders the commercial viability of proton exchange membrane water electrolysis (PEMWE) technology. Herein, we propose a cerium doping strategy to enhance the stability of supported Ir-based catalyst toward OER. The Ce-doped supported catalysts, designated as Ce-IrO/TiN, were synthesized using an organic colloidal method. Transmission Electron Microscopy (TEM) analysis reveals highly dispersed IrO nanoparticles averaging 1.5 nm on the TiN support. X-ray Photoelectron Spectroscopy (XPS) investigations further elucidate that Ce doping effectively stabilizes the Ir species predominantly in states below 4, crucial for modulating the surface electronic structure and thereby improving both the activity and stability of the catalysts. Electrochemical characterization highlights the superior performance of the optimized catalyst, 6 %-Ce-IrO/TiN, with an impressively low overpotential of 242 mV at 10 mA cm and a Tafel slope of 57.5 mV dec, showcasing its significance in facilitating OER. Moreover, its mass activity surpasses that of commercial IrO by 5.1 times at 1.7 V. Prolonged constant current testing further demonstrates the exceptional stability of the catalyst, affirming the critical role of Ce doping as a pivotal strategy for enhancing the stability of supported Ir-based catalysts and advancing the prospects for robust OER performance in PEMWE systems.

中文翻译：

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铈掺杂调节IrOx/TiN表面电子结构促进酸析氧稳定性


负载型铱基催化剂在酸性析氧反应（OER）中的稳定性仍然是一个紧迫的挑战，这阻碍了质子交换膜水电解（PEMWE）技术的商业可行性。在此，我们提出了一种铈掺杂策略来增强负​​载型铱基催化剂的 OER 稳定性。采用有机胶体法合成了 Ce 掺杂负载型催化剂，命名为 Ce-IrO/TiN。透射电子显微镜 (TEM) 分析显示，TiN 载体上高度分散的 IrO 纳米粒子，平均尺寸为 1.5 nm。 X射线光电子能谱（XPS）研究进一步阐明，Ce掺杂有效地将Ir物种主要稳定在低于4的状态，这对于调节表面电子结构并从而提高催化剂的活性和稳定性至关重要。电化学表征凸显了优化催化剂 6%-Ce-IrO/TiN 的优越性能，在 10 mA cm 下具有 242 mV 的极低过电势和 57.5 mV dec 的塔菲尔斜率，展示了其在促进 OER 方面的重要性。此外，其质量活性在 1.7 V 下超过商业 IrO 5.1 倍。长时间的恒流测试进一步证明了该催化剂卓越的稳定性，证实了 Ce 掺杂作为增强负载型 Ir 基催化剂稳定性的关键策略的关键作用。催化剂并推动 PEMWE 系统中 OER 性能的强劲前景。