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<p>Zinc-air battery systems are considered attractive power storage technologies due to their notable theoretical energy output and low production cost. However, the slow kinetics of the cathodic oxygen reduction reaction (ORR) limits their progress toward broad commercialization. To overcome this bottleneck, we propose a novel synthetic route employing a combined microwave-ultrasound-assisted polyol reduction method, yielding a uniformly dispersed PtCo/C-MU catalyst with an average nanoparticle diameter of 3.02&#xa0;nm. The synergistic integration of uniform heating afforded by microwaves and cavitation effects induced by ultrasound facilitates highly efficient co-reduction of Pt and Co precursors, driving their nucleation and growth in the polyol medium. Electrochemical evaluations demonstrate that the PtCo/C-MU catalyst delivers significantly enhanced ORR catalytic performance and superior stability in contrast to the commercial Pt/C benchmark. Notably, when integrated into zinc-air battery systems, PtCo/C-MU delivers a peak power density of 238.10&#xa0;mW&#xa0;cm<sup>−2</sup> and maintains operation exceeding 200&#xa0;h. This readily scalable microwave-ultrasound-assisted polyol technique enables a promising route toward high-performance, economically viable catalysts.</p> Graphical abstract <p></p>

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Microwave-ultrasound synthesis of small-sized, highly dispersed PtCo alloy nanoparticles for efficient oxygen reduction of zinc-air batteries

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Yufeng Su,
  • Dong Fang,
  • Hua Yang,
  • Jian Liu,
  • Yunyan Li,
  • Feng Liu

摘要

Zinc-air battery systems are considered attractive power storage technologies due to their notable theoretical energy output and low production cost. However, the slow kinetics of the cathodic oxygen reduction reaction (ORR) limits their progress toward broad commercialization. To overcome this bottleneck, we propose a novel synthetic route employing a combined microwave-ultrasound-assisted polyol reduction method, yielding a uniformly dispersed PtCo/C-MU catalyst with an average nanoparticle diameter of 3.02 nm. The synergistic integration of uniform heating afforded by microwaves and cavitation effects induced by ultrasound facilitates highly efficient co-reduction of Pt and Co precursors, driving their nucleation and growth in the polyol medium. Electrochemical evaluations demonstrate that the PtCo/C-MU catalyst delivers significantly enhanced ORR catalytic performance and superior stability in contrast to the commercial Pt/C benchmark. Notably, when integrated into zinc-air battery systems, PtCo/C-MU delivers a peak power density of 238.10 mW cm−2 and maintains operation exceeding 200 h. This readily scalable microwave-ultrasound-assisted polyol technique enables a promising route toward high-performance, economically viable catalysts.

Graphical abstract