Triple-junction interfacial engineering Pt–CeO2/three-dimensional nitrogen-doped carbon frameworks electrocatalysts for methanol oxidation reaction

Yunqi Yu, Tong Wang, Askarov Shokhrukhbek, Chenxing Hu, Kangcheng Chen*, Qin Wu*, Yaoyuan Zhang, Daxin Shi, Hansheng Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Efficient Pt-based catalysts towards anodic methanol oxidation reaction (MOR) is crucial to direct methanol fuel cells (DMFCs). Pt-based catalysts with triple-junction interfaces of Pt, metal oxidizes (MOx) and carbon materials have broad engineering prospect due to the synergistic effect among different composites. However, in Pt-MOx/carbon material catalysts reported previously, Pt and MOx nanoparticles (NPs) are too large and the triple-junction interfaces are insufficient. Herein, we innovatively introduce oxidized carbon nanotubes (OCNTs) into nitrogen-doped reduced graphene oxide (NrGO) sheets and propose a cost-efficient self-assembly process for the construction of three-dimensional nitrogen-doped carbon frameworks (NrGO-OCNTs). Furthermore, a modified solvothermal method is developed to uniformly deposit ultrafine Pt and CeO2 NPs onto NrGO-OCNTs so that sufficient Pt–CeO2–C triple-junction interfaces can be introduced. The obtained Pt–CeO2/NrGO7-OCNTs3 catalyst with the NrGO/OCNTs ratio of 7:3 shows the optimum electrochemical surface area and mass activity of 154.9 m2·gPt−1 and 845 A·gPt−1, respectively, which are 2.3 and 3.2 times higher than those of a commercial Pt/C catalyst. It also possesses excellent stability and anti-CO poisoning performance. These improvements may be attributed to the unique architecture of the support and enhanced synergistic effect among Pt, CeO2 and NrGO7-OCNTs3. This approach is simpler and more efficient than other methods reported previously and suitable for engineering of efficient Pt-based catalysts.

Original languageEnglish
Pages (from-to)407-418
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume73
DOIs
Publication statusPublished - 4 Jul 2024

Keywords

  • Methanol oxidation reaction
  • Pt-based catalysts
  • Solvothermal method
  • Three-dimensional nitrogen-doped carbon frameworks
  • Triple-junction interfaces

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