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<p>The kinetically sluggish oxygen evolution reaction (OER) is a major bottleneck restricting the proton-exchange membrane water electrolysis (PEMWEs) for sustainable hydrogen generation. Nevertheless, further boosting OER catalytic performance still faces considerable challenges. Moreover, chlorine impurities are frequently incorporated during catalyst fabrication, which compromises the goal of green‑hydrogen production. Herein, we prepared several Iridium-based catalysts via a chlorine-free two step mixed drying and calcination method. The incorporation of NaNO<sub>3</sub>, KNO<sub>3</sub> and CsNO<sub>3</sub> realized the collaborative modulation of structure and morphology. X-ray photoelectron spectroscopy (XPS) revealed that treatment with CsNO<sub>3</sub> yields a reduced iridium oxidation state and enhanced electron density at Ir active sites. Electrochemical tests confirmed notably reduced OER overpotentials (η) for catalysts modified with CsNO<sub>3</sub> (259.3 mV) and KNO₃ (264.7 mV) vs. reversible hydrogen electrode (RHE) at 10&#xa0;mA cm⁻². Furthermore, the CsNO<sub>3</sub>-modified catalyst exhibited outstanding 20&#xa0;h stability in acidic media. We attribute the superior OER activity and stability of the CsNO<sub>3</sub>-modified catalyst to the synergistic contributions of its distinctive nanorod morphology, unique new crystal structure (like K<sub>0.25</sub>IrO<sub>2</sub>), and enhanced electron density at Ir active sites. This study proposed a chlorine-free synthetic strategy that effectively enhances both electrocatalytic activity and durability, which promotes the development of high efficiency and sustainable PEM electrolysis technologies.</p>

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Boosting acidic oxygen evolution reaction through morphology and structure collaborative modulation of iridium-based catalysts

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Jiayao Deng,
  • Zhiyuan Guo,
  • Wenwen Yang,
  • Liang Chang,
  • Yinuo Wang,
  • Hongjie Zhang,
  • Guizhi Xu,
  • Xiao Hu

摘要

The kinetically sluggish oxygen evolution reaction (OER) is a major bottleneck restricting the proton-exchange membrane water electrolysis (PEMWEs) for sustainable hydrogen generation. Nevertheless, further boosting OER catalytic performance still faces considerable challenges. Moreover, chlorine impurities are frequently incorporated during catalyst fabrication, which compromises the goal of green‑hydrogen production. Herein, we prepared several Iridium-based catalysts via a chlorine-free two step mixed drying and calcination method. The incorporation of NaNO3, KNO3 and CsNO3 realized the collaborative modulation of structure and morphology. X-ray photoelectron spectroscopy (XPS) revealed that treatment with CsNO3 yields a reduced iridium oxidation state and enhanced electron density at Ir active sites. Electrochemical tests confirmed notably reduced OER overpotentials (η) for catalysts modified with CsNO3 (259.3 mV) and KNO₃ (264.7 mV) vs. reversible hydrogen electrode (RHE) at 10 mA cm⁻². Furthermore, the CsNO3-modified catalyst exhibited outstanding 20 h stability in acidic media. We attribute the superior OER activity and stability of the CsNO3-modified catalyst to the synergistic contributions of its distinctive nanorod morphology, unique new crystal structure (like K0.25IrO2), and enhanced electron density at Ir active sites. This study proposed a chlorine-free synthetic strategy that effectively enhances both electrocatalytic activity and durability, which promotes the development of high efficiency and sustainable PEM electrolysis technologies.