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<p>For direct dimethyl ether fuel cells (DDFCs), the anti-poisoning ability of anodic Pt toward reaction intermediates plays a key role in electrocatalytic performance of direct dimethyl ether (DME) oxidation reaction (DOR). Here, we report a novel triple-phase Pt/SnO<sub>2</sub>-porous carbon (PC) catalyst constructed through accurately controlled Pt deposition on a core–shell SnO<sub>2</sub>-PC support. By reducing oxygen functional groups on the PC surface, Pt nanoparticles are preferentially anchored at SnO<sub>2</sub>-PC interfacial boundaries rather than on the carbon surface, creating abundant triple-phase interfaces (Pt/SnO<sub>2</sub>-PC) for DOR. The triple-phase interface structure of Pt/SnO<sub>2</sub>-PC can effectively anchor the Pt nanoparticles, ensuring both their uniform dispersion and maintaining excellent electronic conductivity. The mass activity (MA) of the Pt/SnO<sub>2</sub>-PC reaches 236.4&#xa0;mA· mg<sub>pt</sub><sup>−1</sup>, which is 2.2 times of Pt/C. The accelerated potential cycling tests (APCT) after 5000 cycles reveal that the electrochemically active surface area (ESA) of Pt/SnO<sub>2</sub>-PC decreases only 36.82% less than Pt/C (60.40%). This study presents a new light on tuning Pt location and constructing triple-phase interface structure of Pt-based catalyst, which can enhance the electrocatalytic performance of DOR.</p>

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Functional group-mediated construction of Pt/SnO2-porous carbon triple-phase interfaces for electrocatalytic dimethyl ether oxidation

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Lehong Xing,
  • Yutong Zhao,
  • Fanxu Meng,
  • Yungui Hao,
  • Chenyang Sun,
  • Yue Zuo,
  • Shuang Guan,
  • Jin Wang

摘要

For direct dimethyl ether fuel cells (DDFCs), the anti-poisoning ability of anodic Pt toward reaction intermediates plays a key role in electrocatalytic performance of direct dimethyl ether (DME) oxidation reaction (DOR). Here, we report a novel triple-phase Pt/SnO2-porous carbon (PC) catalyst constructed through accurately controlled Pt deposition on a core–shell SnO2-PC support. By reducing oxygen functional groups on the PC surface, Pt nanoparticles are preferentially anchored at SnO2-PC interfacial boundaries rather than on the carbon surface, creating abundant triple-phase interfaces (Pt/SnO2-PC) for DOR. The triple-phase interface structure of Pt/SnO2-PC can effectively anchor the Pt nanoparticles, ensuring both their uniform dispersion and maintaining excellent electronic conductivity. The mass activity (MA) of the Pt/SnO2-PC reaches 236.4 mA· mgpt−1, which is 2.2 times of Pt/C. The accelerated potential cycling tests (APCT) after 5000 cycles reveal that the electrochemically active surface area (ESA) of Pt/SnO2-PC decreases only 36.82% less than Pt/C (60.40%). This study presents a new light on tuning Pt location and constructing triple-phase interface structure of Pt-based catalyst, which can enhance the electrocatalytic performance of DOR.