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Research Article

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

Shuna Li1,§, Haixiao Sun1,§, Jiaai Zhang1, Longjiao Zheng1, Yunrui Li1, Xu Fang1, Yujie Liu1, Qi Song1, Zhen Wang1, Yufeng Gao1, Xin Zhang1(), Xiaoping Dai1, Yandi Cai2, Fei Gao2()
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering and Environment, China University of Petroleum, Beijing 102249, China
Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Nanjing University, Nanjing 210093, China

§ Shuna Li and Haixiao Sun contributed equally to this work.

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The SnO2/PtNi catalysts enclosed by high-index facets display excellent electrocatalytic activity and long-term durability as well as strong CO resistance for ethylene glycol oxidation, which is ascribed to interfacial synergistic interaction between ultrasmall SnO2 and PtNi concave nanocubes.

Abstract

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/cm2, 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 SnO2 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.

Keywords

Pt-based catalysthigh-index facetsundercoordinated surface atomsinterfacial synergistic effectethylene glycol electro-oxidation

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Nano Research
Volume 15 Issue 9,
September 2022
Pages 7877-7886
DOI: 10.1007/s12274-022-4433-0
Cite this article:
Li S, Sun H, Zhang J, et al. Interfacial synergistic effect in SnO2/PtNi nanocrystals enclosed by high-index facets for high-efficiency ethylene glycol electrooxidation. Nano Research, 2022, 15(9): 7877-7886. https://doi.org/10.1007/s12274-022-4433-0
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