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<p>Platinum is a crucial anode catalyst in methanol oxidation reactions (MOR) due to its exceptional electrochemical performance, which has led to its widespread application. However, to enhance its catalytic activity and stability, platinum is typically supported on carrier materials, such as carbon-based substrates. Current commercial platinum-carbon catalysts exhibit limited activity, low utilization efficiency of metallic platinum, and a tendency to bind with intermediate species, leading to a decline in catalytic performance. To address these challenges, this study proposes the utilization of copper-doped carbon for the development of a composite support (Cu<sub>2</sub>C<sub>7</sub>). Compared with the pure carbon supported platinum catalyst (Pt@Cu<sub>0</sub>C<sub>7</sub>), the electrochemical activity of Cu<sub>2</sub>C<sub>7</sub> supported platinum catalyst (Pt@Cu<sub>2</sub>C<sub>7</sub>) was significantly enhanced, as evidenced by a current density of 412 mA/cm<sup>2</sup> and an onset potential of −0.8 V. In chronoamperometry experiments, after 2 h of electrochemical testing, the activity of Pt@Cu<sub>2</sub>C<sub>7</sub> decreased by only 4.24%, whereas Pt@Cu<sub>0</sub>C<sub>7</sub> experienced a significant reduction of 55% in activity. The incorporation of copper is hypothesized to provide additional active sites for the deposition of metallic platinum on the carrier, thereby enhancing the platinum loading capacity. According to inductively coupled plasma (ICP) analysis, when the copper-to-carbon ratio is 2:7, the platinum loading amount increases by 25.78%. Furthermore, some platinum forms an alloy with the copper embedded in the carbon, a phenomenon corroborated by X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The literature suggests that the formation of such alloys can significantly improve the catalyst’s resistance to poisoning. The incorporation of copper not only enhances the platinum loading capacity but may also induce a synergistic effect among the active platinum components, thereby further improving catalytic performance. In summary, the findings of this study offer critical theoretical insights and practical guidelines for the design of high-performance MOR electrocatalysts, laying a robust foundation for future advancements in catalyst development.</p>

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Enhanced Methanol Fuel Cell Performance Using Copper-doped Carbon-supported Platinum Catalysts

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Haozhe Wang,
  • Xueli Bai,
  • Jiamei Li,
  • Hao Li,
  • Xiaoping Zhang,
  • Feng Wang

摘要

Platinum is a crucial anode catalyst in methanol oxidation reactions (MOR) due to its exceptional electrochemical performance, which has led to its widespread application. However, to enhance its catalytic activity and stability, platinum is typically supported on carrier materials, such as carbon-based substrates. Current commercial platinum-carbon catalysts exhibit limited activity, low utilization efficiency of metallic platinum, and a tendency to bind with intermediate species, leading to a decline in catalytic performance. To address these challenges, this study proposes the utilization of copper-doped carbon for the development of a composite support (Cu2C7). Compared with the pure carbon supported platinum catalyst (Pt@Cu0C7), the electrochemical activity of Cu2C7 supported platinum catalyst (Pt@Cu2C7) was significantly enhanced, as evidenced by a current density of 412 mA/cm2 and an onset potential of −0.8 V. In chronoamperometry experiments, after 2 h of electrochemical testing, the activity of Pt@Cu2C7 decreased by only 4.24%, whereas Pt@Cu0C7 experienced a significant reduction of 55% in activity. The incorporation of copper is hypothesized to provide additional active sites for the deposition of metallic platinum on the carrier, thereby enhancing the platinum loading capacity. According to inductively coupled plasma (ICP) analysis, when the copper-to-carbon ratio is 2:7, the platinum loading amount increases by 25.78%. Furthermore, some platinum forms an alloy with the copper embedded in the carbon, a phenomenon corroborated by X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The literature suggests that the formation of such alloys can significantly improve the catalyst’s resistance to poisoning. The incorporation of copper not only enhances the platinum loading capacity but may also induce a synergistic effect among the active platinum components, thereby further improving catalytic performance. In summary, the findings of this study offer critical theoretical insights and practical guidelines for the design of high-performance MOR electrocatalysts, laying a robust foundation for future advancements in catalyst development.