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Research Article

Enhanced O2 reduction on atomically thin Pt-based nanoshells by integrating surface facet, interfacial electronic, and substrate stabilization effects

Wei Ye§, Zhongti Sun§, Chengming Wang( ), Mengshan Ye, Chenhao Ren, Ran Long, Xusheng Zheng, Junfa Zhu, Xiaojun Wu( ), Yujie Xiong( )
Hefei National Laboratory for Physical Sciences at the MicroscaleiChEM (Collaborative Innovation Center of Chemistry for Energy Materials)Synergetic Innovation of Quantum Information & Quantum TechnologySchool of Chemistry and Materials ScienceCAS Center for Excellence in Nanoscienceand National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei230026China

§Wei Ye and Zhongti Sun contributed equally to this work.

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Abstract

To fully realize the commercial viability of Pt in fuel cells, the usage of scarce Pt must be reduced while the activity and durability in O2 reduction reaction (ORR) must be enhanced. Here we report a metallic stack design achieving these goals for ORR, based on atomically precise materials synthesis. Au@Pd@Pt nanostructures with atomically thin Pt shells and high-index surfaces form an excellent platform for integrating the effects of electronic structures, surface facets, and substrate stabilization to boost ORR performance. Au@Pd@Pt trisoctahedrons (TOH) achieve mass activity 6.1 times higher than that of commercial Pt/C and dramatically enhanced durability beyond 1.0 V vs. a reversible hydrogen electrode in oxidation potential. Meanwhile, Pt comprises only 3.2% of the nanostructures. To further improve the ORR activity and demonstrate the versatility of our strategy, we implement the same design in PtNi alloy electrocatalysts. The Au@Pd@PtNi TOHs exhibit mass activity 14.3 times higher than that of commercial Pt/C as well as excellent durability. This work demonstrates an alternative strategy for fabricating high-performance and low-cost catalysts, and highlights the importance of simultaneous surface and interfacial engineering with atomic precision in designing catalysts.

Keywords

oxygen reduction reactionelectrocatalysisinterfacial electronic effectsurface facetsubstrate stabilizationPt

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Nano Research
Volume 11 Issue 6,
June 2018
Pages 3313-3326
DOI: 10.1007/s12274-017-1891-x
Cite this article:
Ye W, Sun Z, Wang C, et al. Enhanced O2 reduction on atomically thin Pt-based nanoshells by integrating surface facet, interfacial electronic, and substrate stabilization effects. Nano Research, 2018, 11(6): 3313-3326. https://doi.org/10.1007/s12274-017-1891-x
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Received: 17 August 2017
Revised: 20 September 2017
Accepted: 20 October 2017
Published: 22 May 2018
© Tsinghua University Press and Springer‐Verlag GmbH Germany 2017
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