4.8 Article

Interfacial synergistic effect in SnO2/PtNi nanocrystals enclosed by high-index facets for high-efficiency ethylene glycol electrooxidation

Journal

NANO RESEARCH
Volume 15, Issue 9, Pages 7877-7886

Publisher

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4433-0

Keywords

Pt-based catalyst; high-index facets; undercoordinated surface atoms; interfacial synergistic effect; ethylene glycol electro-oxidation

Funding

  1. National Natural Science Foundation of China [21573286]
  2. Key Scientific and Technological Innovation Project in Shandong Province [2019JZZY010343]

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Strengthening the oxide-metal interfacial synergistic interaction in nanocatalysts is an effective strategy to enhance the intrinsic activities and availability of active sites. In this study, SnO2/PtNi concave nanocubes enclosed by high-index facets were successfully fabricated and exhibited significantly improved catalytic performance for electrooxidation reactions. The strong interfacial interaction between SnO2 and PtNi not only reduces the activation energy barrier but also enhances the catalyst's CO-resistance and long-term stability.
Strengthening the oxide-metal interfacial synergistic interaction in nanocatalysts is identified as potential strategy to boost intrinsic activities and the availability of active sites by regulating the surface/interface environment of catalysts. Herein, the SnO2/PtNi concave nanocubes (CNCs) enclosed by high-index facets (HIFs) with tunable SnO2 composition are successfully fabricated through combining the hydrothermal and self-assembly method. The interfacial interaction between ultrafine SnO2 nanoparticles and PtNi with HIFs surface structure is characterized by analytical techniques. The as-prepared 0.20%SnO2/PtNi catalyst exhibits extraordinarily high catalytic performance for ethylene glycol electrooxidation (EGOR) in acidic conditions with specific activity of 3.06 mA/cm(2), which represents 6.2-fold enhancement compared with the state-of-the-art Pt/C catalyst. Additionally, the kinetic study demonstrates that the strong interfacial interaction between SnO(2 )and PtNi not only degrades the activation energy barrier during the process of EGOR but also enhances the CO-resistance ability and long-term stability. This study provides a novel perspective to construct highly efficient and stable electrocatalysts for energy conversions.

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