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<p>This study presents a systematic investigation of CeO<sub>2</sub>-doped reduced graphene oxide (RGO) as a support for platinum catalysts in direct methanol fuel cells. CeO<sub>2</sub>/RGO composites with loadings of 3–10 wt% CeO<sub>2</sub> were synthesized via controlled precipitation and thermal reduction, followed by the deposition of Pt nanoparticles using ascorbic acid as a reducing agent. Physical characterization by XRD, TEM, and XPS confirmed the uniform dispersion of Pt nanoparticles (3–4&#xa0;nm) and revealed chemical interactions between Pt and CeO<sub>2</sub>. Electrochemical testing demonstrated that the catalyst with 5% CeO<sub>2</sub> doping exhibited optimal performance: A methanol oxidation current of 959&#xa0;mA/mgPt, which is four times higher than that of the undoped Pt/RGO benchmark. An electrochemical surface area (ECSA) of 87.1 m<sup>2</sup>/g. Enhanced CO tolerance, as indicated by an If/Ib ratio of 1.24. The enhanced catalytic activity is attributed to the oxygen storage capacity of CeO<sub>2</sub> and synergistic interfacial effects between Pt and CeO<sub>2</sub>, which were evidenced by a positive shift in the Pt4f binding energy observed in XPS analysis. This work demonstrates a cost-effective strategy for improving Pt utilization in fuel cell anodes through doping with rare earth oxides.</p>

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Preparation of CeO2-doped graphene supported platinum catalysts for enhanced methanol oxidation and oxygen reduction reactions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月8日

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  • Ying Li,
  • Min Cong Wu,
  • Xin Zhang

摘要

This study presents a systematic investigation of CeO2-doped reduced graphene oxide (RGO) as a support for platinum catalysts in direct methanol fuel cells. CeO2/RGO composites with loadings of 3–10 wt% CeO2 were synthesized via controlled precipitation and thermal reduction, followed by the deposition of Pt nanoparticles using ascorbic acid as a reducing agent. Physical characterization by XRD, TEM, and XPS confirmed the uniform dispersion of Pt nanoparticles (3–4 nm) and revealed chemical interactions between Pt and CeO2. Electrochemical testing demonstrated that the catalyst with 5% CeO2 doping exhibited optimal performance: A methanol oxidation current of 959 mA/mgPt, which is four times higher than that of the undoped Pt/RGO benchmark. An electrochemical surface area (ECSA) of 87.1 m2/g. Enhanced CO tolerance, as indicated by an If/Ib ratio of 1.24. The enhanced catalytic activity is attributed to the oxygen storage capacity of CeO2 and synergistic interfacial effects between Pt and CeO2, which were evidenced by a positive shift in the Pt4f binding energy observed in XPS analysis. This work demonstrates a cost-effective strategy for improving Pt utilization in fuel cell anodes through doping with rare earth oxides.