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Exposure of sufficient edge sites on well-crystallized MoSe2 induced by nitrogen doping (Mo−Nx) for Pt: Enhanced co-catalytic activity and methanol tolerance for oxygen reduction

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  • Pan, Siyu
  • Cai, Zhuang
  • Yang, Liu
  • Tang, Bo
  • Xu, Xin
  • Chen, Hun
  • Ran, Lingling
  • Jing, Baojian
  • Zou, Jinlong

Abstract

To endow catalyst supports with excellent co-catalytic activity is an effective way to strengthen methanol-tolerance of Pt-based catalysts towards oxygen reduction reaction (ORR). In this study, nitrogen-doped molybdenum selenide/biomass-derived carbon (N-MoSe2/BC) composite as a Pt-support/co-catalyst is prepared via a synchronous synthesis method to enhance methanol tolerance. The porous structure of N-MoSe2/BC with N-doping can improve the exposure of coordinated Mo–Sex sites along MoSe2 edges and provide the oxygen diffusion channels to promote ORR activity. Pt-N-MoSe2/BC (Pt, 5 wt.%) shows high activity (14.83 mA cm−2) and selectivity (4e− pathway) towards ORR, promising durability (11.9% decline) and excellent tolerance against methanol-crossover effects, which are superior to those of commercial Pt/C (10 wt.%). With the introduction of pyridinic N, graphitic N and Mo−Nx in MoSe2/BC, more active sites on Pt (111) facets are activated to enhance charge transfer efficiency and ORR activity. Both N-species in BC and exposed edge sites in N-MoSe2 contribute to high methanol-tolerance and co-catalytic activity towards ORR. Therefore, the remarkable ORR activity is originated from the synergistic effects among well-distributed Pt, N-species, and active edge sites of MoSe2. Design of porous (N)-MoSe2/BC provides a promising direction for preparation of co-catalyst/support with strong methanol tolerance and ORR activity.

Suggested Citation

  • Pan, Siyu & Cai, Zhuang & Yang, Liu & Tang, Bo & Xu, Xin & Chen, Hun & Ran, Lingling & Jing, Baojian & Zou, Jinlong, 2018. "Exposure of sufficient edge sites on well-crystallized MoSe2 induced by nitrogen doping (Mo−Nx) for Pt: Enhanced co-catalytic activity and methanol tolerance for oxygen reduction," Energy, Elsevier, vol. 159(C), pages 11-20.
    • Handle: RePEc:eee:energy:v:159:y:2018:i:c:p:11-20
    DOI: 10.1016/j.energy.2018.06.114
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