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<p>Single-atom catalysts maximize atomic utilization but the limited diversity of their functional sites presents challenges in multistep combustion processes, particularly for low-carbon alkanes with high C–H bond energies. Here we synthesized a dual-atom Pt–Nb catalyst using antimony tin oxide for low-temperature propane activation and combustion using a current-assisted strategy. This catalytic system achieves complete propane conversion at low temperatures (<i>T</i><sub>90</sub> &lt; 200 °C), with a high turnover frequency at 220 °C of 27.67 × 10<sup>−3</sup> s<sup>−1</sup>. Moreover, the catalyst exhibits outstanding water resistance and significantly reduces the use of precious metal by over 80% under current assistance. Further systematic in situ experiments and theoretical simulations indicate that the proximity of current-assisted niobium atoms to platinum atoms facilitates the dissociation of C–H bonds in propane and the desorption of carbon dioxide, while the electric current weakens the Pt–O bonds near the niobium side, promoting the activation and release of lattice oxygen. This stepwise-boosting, current-assisted atomic relay mechanism offers a promising strategy for developing next-generation green catalysts.</p><p></p>

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Current-assisted dual-atom catalyst sequentially boosts low-temperature propane combustion through atomic relay

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Yangfei Fang,
  • Xinyu Han,
  • Kaijie Liu,
  • Zhaoxu Yuan,
  • Yannan Li,
  • Songyun Tao,
  • Zeshu Zhang,
  • Cheng Rao,
  • Qi Fu,
  • Guan Peng,
  • Xiangguang Yang,
  • Dingsheng Wang,
  • Yibo Zhang,
  • Wuping Liao

摘要

Single-atom catalysts maximize atomic utilization but the limited diversity of their functional sites presents challenges in multistep combustion processes, particularly for low-carbon alkanes with high C–H bond energies. Here we synthesized a dual-atom Pt–Nb catalyst using antimony tin oxide for low-temperature propane activation and combustion using a current-assisted strategy. This catalytic system achieves complete propane conversion at low temperatures (T90 < 200 °C), with a high turnover frequency at 220 °C of 27.67 × 10−3 s−1. Moreover, the catalyst exhibits outstanding water resistance and significantly reduces the use of precious metal by over 80% under current assistance. Further systematic in situ experiments and theoretical simulations indicate that the proximity of current-assisted niobium atoms to platinum atoms facilitates the dissociation of C–H bonds in propane and the desorption of carbon dioxide, while the electric current weakens the Pt–O bonds near the niobium side, promoting the activation and release of lattice oxygen. This stepwise-boosting, current-assisted atomic relay mechanism offers a promising strategy for developing next-generation green catalysts.