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<p>The development of an efficient oxygen reduction reaction (ORR) electrocatalyst using seawater as electrolyte is the key to realizing the utilization of marine resources and the application of zinc-air batteries (ZABs). Herein, Pt anchored on oxygen vacancies-enriched WO<sub>3</sub> electrocatalysts (Pt//WO<sub>3-V</sub>) is constructed by a microwave method. <i>In situ</i> characterization and theoretical calculation suggest that the presence of oxygen vacancies triggers the electron reversal mechanism, driving charge transfer from WO<sub>3</sub> to Pt via an oxygen bridge (W–O–Pt), which modulates the electronic structure of Pt and enhances the ORR catalytic activity. In addition, the electron reversal mechanism mediated by oxygen vacancies promotes the formation of an electron-rich layer around Pt, which effectively suppresses chloride ion (Cl<sup>−</sup>) adsorption and prevents poisoning of Pt active sites. As a result, Pt//WO<sub>3-V</sub> has a half-wave potential (<i>E</i><sub>1/2</sub>) of 0.90 V in alkaline seawater. The maximum power density of 192 mW cm<sup>−2</sup> is obtained when Pt//WO<sub>3-V</sub> is used as the cathode catalyst in alkaline seawater-based ZABs, achieving stable operation over 120 h.</p>

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Electron reverse triggered by oxygen vacancies to break the activity-stability trade-off for oxygen reduction in alkaline seawater

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Guiru Sun,
  • Xiangyan Kong,
  • Huimin Mao,
  • Siqi Wu,
  • Yanru Liu,
  • Dongxiang Li,
  • Yingxia Zong,
  • Jingqi Chi,
  • Zexing Wu,
  • Xiaobin Liu,
  • Lei Wang

摘要

The development of an efficient oxygen reduction reaction (ORR) electrocatalyst using seawater as electrolyte is the key to realizing the utilization of marine resources and the application of zinc-air batteries (ZABs). Herein, Pt anchored on oxygen vacancies-enriched WO3 electrocatalysts (Pt//WO3-V) is constructed by a microwave method. In situ characterization and theoretical calculation suggest that the presence of oxygen vacancies triggers the electron reversal mechanism, driving charge transfer from WO3 to Pt via an oxygen bridge (W–O–Pt), which modulates the electronic structure of Pt and enhances the ORR catalytic activity. In addition, the electron reversal mechanism mediated by oxygen vacancies promotes the formation of an electron-rich layer around Pt, which effectively suppresses chloride ion (Cl−) adsorption and prevents poisoning of Pt active sites. As a result, Pt//WO3-V has a half-wave potential (E1/2) of 0.90 V in alkaline seawater. The maximum power density of 192 mW cm−2 is obtained when Pt//WO3-V is used as the cathode catalyst in alkaline seawater-based ZABs, achieving stable operation over 120 h.