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<p>The development of Pt-based catalysts with high catalytic activity and stability is the key to improving the electrooxidation performance of dimethyl ether (DME). Increasing the number of active sites in the catalyst can mitigate performance degradation caused by reduced Pt loading. In this study, we propose a core–shell structured composite support where tin dioxide (SnO<sub>2</sub>) is encapsulated within carbon nanotubes (CNTs) to form CNTs@SnO<sub>2</sub>, followed by Pt deposition via a solvothermal method. This unique architecture prevents SnO<sub>2</sub> from covering Pt deposition sites on the outer CNTs surface. The encapsulated SnO<sub>2</sub> modifies the CNTs surface, providing abundant OH<sub>ads</sub> groups that facilitate the removal of poisoning CO<sub>ads</sub> intermediates and stabilize Pt nanoparticles. The Pt/CNTs@SnO<sub>2</sub> exhibites a high electrochemical surface area (ESA, 89.85&#xa0;m<sup>2</sup>&#xa0;g<sup>−1</sup>) and mass activity (MA, 312.33&#xa0;mA&#xa0;mg<sub>Pt</sub><sup>−1</sup>). The accelerated potential cycling tests (APCT) show that the ESA of the Pt/CNTs@SnO<sub>2</sub> catalyst is only attenuated by 26.88% after 5000 cycles. These results demonstrate that Pt/CNTs@SnO<sub>2</sub> can maximize Pt utilization and co-catalytic effects, leading to superior catalytic activity and stability for DME electrooxidation compared to conventional Pt/CNTs, Pt/CNTs+SnO<sub>2</sub> and Pt/SnO<sub>2</sub>-CNTs catalysts. This work provides a promising strategy for designing high-performance Pt-based catalysts for fuel cell applications.</p>

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Platinum supported on carbon nanotubes-encapsulated tin dioxide composites for efficient electrooxidation of dimethyl ether

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Lehong Xing,
  • Yutong Zhao,
  • Fanxu Meng,
  • Chenyang Sun,
  • Yue Zuo,
  • Jiayi Liu,
  • Jia Li,
  • Yiping Liu,
  • Shuo Bian

摘要

The development of Pt-based catalysts with high catalytic activity and stability is the key to improving the electrooxidation performance of dimethyl ether (DME). Increasing the number of active sites in the catalyst can mitigate performance degradation caused by reduced Pt loading. In this study, we propose a core–shell structured composite support where tin dioxide (SnO2) is encapsulated within carbon nanotubes (CNTs) to form CNTs@SnO2, followed by Pt deposition via a solvothermal method. This unique architecture prevents SnO2 from covering Pt deposition sites on the outer CNTs surface. The encapsulated SnO2 modifies the CNTs surface, providing abundant OHads groups that facilitate the removal of poisoning COads intermediates and stabilize Pt nanoparticles. The Pt/CNTs@SnO2 exhibites a high electrochemical surface area (ESA, 89.85 m2 g−1) and mass activity (MA, 312.33 mA mgPt−1). The accelerated potential cycling tests (APCT) show that the ESA of the Pt/CNTs@SnO2 catalyst is only attenuated by 26.88% after 5000 cycles. These results demonstrate that Pt/CNTs@SnO2 can maximize Pt utilization and co-catalytic effects, leading to superior catalytic activity and stability for DME electrooxidation compared to conventional Pt/CNTs, Pt/CNTs+SnO2 and Pt/SnO2-CNTs catalysts. This work provides a promising strategy for designing high-performance Pt-based catalysts for fuel cell applications.