4.8 Article

Pd-Sn alloy nanoparticles for electrocatalytic methanol oxidation: Phase evolution from solid solution to intermetallic compounds

Journal

NANO RESEARCH
Volume 15, Issue 10, Pages 8819-8825

Publisher

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4565-2

Keywords

Pd-Sn alloy; intermetallic compound; hollow structure; electrocatalysis; methanol oxidation reaction

Funding

  1. Natural Science Foundation of Tianjin, China [18JCYBJC20600]
  2. Institute of Energy, Hefei Comprehensive National Science Center [19KZS207]

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Developing efficient catalysts with high activity and durability is crucial for energy conversion in electro-catalytic reactions. The structure difference of hollow-structured nanocrystals of Pd-Sn alloy has been studied using electron microscopy and spectroscopy. Pd3Sn2 IMCs exhibit outstanding activity in methanol oxidation reaction.
Developing efficient catalysts with high activity and durability via alloying strategy is essential to the energy conversion in various electro-catalytic reactions. Among the different alloy structures, intermetallic compounds (IMCs) have received much attention recently due to the special geometric and electronic effects and outstanding activity and durability, endowed by their ordered structure. Herein, A series of hollow-structured nanocrystals of Pd-Sn alloy, including face-centered cubic solid solution of Pd(Sn), IMCs of Pd2Sn, and IMCs of Pd3Sn2, are fabricated via a solvothermal strategy by varying the precursor ratio of Pd and Sn. The structure difference of the nanocrystals has been investigated via combined electron microscopy and spectroscopy, assisted by local elemental separation analysis and X-ray spectroscopy. Among all, Pd3Sn2 IMCs show outstanding methanol oxidation reaction (MOR) activity in terms of mass activity (1.3 A.mg(p)(d)(-1)) and specific activity (5.03 mA.cm(-2)). Through density functional theory (DFT) simulation calculations on three different Pd-Sn alloy models, the performance has been well understood. As compared with Pd(Sn) and Pd2Sn, the high MOR kinetics on Pd3Sn2 is featured by its weaker CO adsorption and favorable CO-OH co-adsorption.

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