In situ shaped PtPd nanocubes on common carbon powder for efficient methanol electrooxidation in practical fuel cells

Weicong Li, Narayanamoorthy Bhuvanendran, Huiyuan Liu, Weiqi Zhang, Khadijeh Hooshyari, Sae Youn Lee, Qian Xu, Huaneng Su

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Platinum-group-metal-based polyhedral nanostructures generally possess high catalytic activity for electrochemical reactions owing to their numerous edges, corners, and well-defined lattice planes. However, their direct synthesis on common carbon powder is difficult, which considerably hinders their applications in practical devices. Herein, we report PtPd nanocubes (NCs) grown in situ on commercial carbon powder (Vulcan XC-72R) using a facile one-pot method. The as-prepared PtPd NCs/C (∼20 wt% metal) possess Pt-enriched surfaces, enabling the mass activity (MA) of methanol oxidation reaction (MOR) up to 1.77 A mgPt−1, which is 3.34/3.69 times that of commercial PtRu/C and Pt/C, respectively. With an average size of 8–10 nm, the PtPd NCs/C exhibit high stability, retaining over 80% initial MA against MOR in an accelerated durability test. For practical direct-methanol fuel cell (DMFC) operation, the PtPd NC/C as an anode catalyst delivered a maximum power density of 0.232 W cm−2 with high-concentration methanol (10 M) flow, which is 1.6 times higher than that for commercial PtRu/C under the same conditions. Moreover, the PtPd NCs/C demonstrated excellent durability for DMFC operation with much lower voltage decay than commercial PtRu/C, indicating its excellent potential for practical DMFC applications.

Original languageEnglish
Pages (from-to)1496-1506
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume50
DOIs
StatePublished - 2 Jan 2024

Keywords

  • Direct methanol fuel cell
  • In-situ preparation
  • Methanol oxidation reaction
  • PtPd nanocubes

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