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<p>The oxygen evolution reaction (OER), serving as the anode in water electrolysis, plays a pivotal role in various applications. Developing efficient non-iridium-based catalysts for acidic water splitting remains a significant challenge. This study employs a phase engineering strategy to synthesize defect-rich crystalline/amorphous Ru<sub>0.6</sub>Mo<sub>0.2</sub>Cr<sub>0.2</sub>O<sub>x</sub> solid solution catalysts through dual-metal doping. The catalyst exhibits superior acidic OER performance with an overpotential of 204&#xa0;mV (@10&#xa0;mA&#xa0;cm<sup>−2</sup>) and mass activity of 577.8 A g<sub>Ru</sub><sup>−1</sup> at 1.5&#xa0;V vs RHE, outperforming all control samples. Furthermore, synergistic Cr/Mo doping effectively reduces the oxidation state of Ru in RuO<sub>2</sub> while enhancing structural stability, resulting in minimal activity decay during prolonged testing. Theoretical calculations reveal that dual-doping synergistically modulates charge distribution on Ru sites, lowering the energy barrier for *OOH formation in the thermodynamic limiting step. This work provides a facile strategy for developing high-performance acidic OER catalysts with dramatically reduced noble metal loading, demonstrating critical industrial relevance.</p>

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Constructing crystalline-amorphous heterophase interfaces through Cr/Mo co-doping in RuO2 enables efficient acidic oxygen evolution reaction

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Jian Yang,
  • Yaowen Zhang,
  • Yongping Liu

摘要

The oxygen evolution reaction (OER), serving as the anode in water electrolysis, plays a pivotal role in various applications. Developing efficient non-iridium-based catalysts for acidic water splitting remains a significant challenge. This study employs a phase engineering strategy to synthesize defect-rich crystalline/amorphous Ru0.6Mo0.2Cr0.2Ox solid solution catalysts through dual-metal doping. The catalyst exhibits superior acidic OER performance with an overpotential of 204 mV (@10 mA cm−2) and mass activity of 577.8 A gRu−1 at 1.5 V vs RHE, outperforming all control samples. Furthermore, synergistic Cr/Mo doping effectively reduces the oxidation state of Ru in RuO2 while enhancing structural stability, resulting in minimal activity decay during prolonged testing. Theoretical calculations reveal that dual-doping synergistically modulates charge distribution on Ru sites, lowering the energy barrier for *OOH formation in the thermodynamic limiting step. This work provides a facile strategy for developing high-performance acidic OER catalysts with dramatically reduced noble metal loading, demonstrating critical industrial relevance.