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<p>The objective of this research was to enhance the catalytic performance of Pt nanoparticles in the electrooxidation of methanol through the deposition of La-doped Ta<sub>2</sub>O<sub>5</sub> onto MWCNTs. The synthesis of Pt/Ta<sub>2</sub>O<sub>5</sub>-La/MWCNTs with high catalytic activity and stability was achieved via the hydrothermal loading of lanthanum into Ta<sub>2</sub>O<sub>5</sub>/MWCNTs, followed by a dual reduction of Pt onto Ta<sub>2</sub>O<sub>5</sub>-La/MWCNTs using sodium borohydride and ethylene glycol. Experimental findings indicate that lanthanum doping significantly enhances the electronic conductivity of Ta<sub>2</sub>O<sub>5</sub>, increases the electrochemically active surface area, and consequently improves the electrocatalytic activity associated with the charge transfer process. The physical characteristics of the catalyst were analyzed using XPS, TEM, Raman spectroscopy, FESEM, and XRD. The electrochemical active surface area, electrocatalytic activity, rate-determining step, and catalyst stability were assessed through cyclic voltammetry and chronoamperometry. The results revealed that the Pt/Ta<sub>2</sub>O<sub>5</sub>-La/MWCNTs catalysts exhibited the highest ESA and electrocatalytic oxidation activity for methanol at a La-doping concentration of 25%. In comparison to the undoped Pt/MWCNTs catalyst, the Pt/Ta<sub>2</sub>O<sub>5</sub>-La/MWCNTs-25% catalyst demonstrated an approximately 3.2-fold increase in methanol oxidation activity and exhibited superior long-term catalytic stability. Furthermore, the BET test shows that the Pt/Ta<sub>2</sub>O<sub>5</sub>-La/MWCNTs-25% catalyst has the largest specific surface area, thereby reinforcing the beneficial impact of lanthanum doping on catalyst performance. This study presents a viable strategy for enhancing the efficacy of anode catalysts in DMFC.</p>

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Enhancement of the catalytic activity of Pt nanoparticles toward methanol electro-oxidation using La-doped Ta2O5/MWCNTs supporting materials

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Bohua Wu,
  • Xicheng Lu,
  • Fengxiao Du,
  • Yifan Liu,
  • Xiaoqin Wang,
  • Shanxin Xiong

摘要

The objective of this research was to enhance the catalytic performance of Pt nanoparticles in the electrooxidation of methanol through the deposition of La-doped Ta2O5 onto MWCNTs. The synthesis of Pt/Ta2O5-La/MWCNTs with high catalytic activity and stability was achieved via the hydrothermal loading of lanthanum into Ta2O5/MWCNTs, followed by a dual reduction of Pt onto Ta2O5-La/MWCNTs using sodium borohydride and ethylene glycol. Experimental findings indicate that lanthanum doping significantly enhances the electronic conductivity of Ta2O5, increases the electrochemically active surface area, and consequently improves the electrocatalytic activity associated with the charge transfer process. The physical characteristics of the catalyst were analyzed using XPS, TEM, Raman spectroscopy, FESEM, and XRD. The electrochemical active surface area, electrocatalytic activity, rate-determining step, and catalyst stability were assessed through cyclic voltammetry and chronoamperometry. The results revealed that the Pt/Ta2O5-La/MWCNTs catalysts exhibited the highest ESA and electrocatalytic oxidation activity for methanol at a La-doping concentration of 25%. In comparison to the undoped Pt/MWCNTs catalyst, the Pt/Ta2O5-La/MWCNTs-25% catalyst demonstrated an approximately 3.2-fold increase in methanol oxidation activity and exhibited superior long-term catalytic stability. Furthermore, the BET test shows that the Pt/Ta2O5-La/MWCNTs-25% catalyst has the largest specific surface area, thereby reinforcing the beneficial impact of lanthanum doping on catalyst performance. This study presents a viable strategy for enhancing the efficacy of anode catalysts in DMFC.