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Research Article

Enhancement of oxygen reduction reaction activity by grain boundaries in platinum nanostructures

Enbo Zhu1,2,§, Wang Xue3,§, Shiyi Wang4,§, Xucheng Yan1, Jingxuan Zhou1, Yang Liu1, Jin Cai1, Ershuai Liu5, Qingying Jia5, Xiangfeng Duan3,6, Yujing Li2, Hendrik Heinz4( ), Yu Huang1,6 ( )
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80309, USA
Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA

§ Enbo Zhu, Wang Xue, and Shiyi Wang contributed equally to this work.

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Abstract

Systematic control of grain boundary densities in various platinum (Pt) nanostructures was achieved by specific peptide-assisted assembly and coagulation of nanocrystals. A positive quadratic correlation was observed between the oxygen reduction reaction (ORR) specific activities of the Pt nanostructures and the grain boundary densities on their surfaces. Compared to commercial Pt/C, the grain-boundary-rich strain-free Pt ultrathin nanoplates demonstrated a 15.5 times higher specific activity and a 13.7 times higher mass activity. Simulation studies suggested that the specific activity of ORR was proportional to the resident number and the resident time of oxygen on the catalyst surface, both of which correlate positively with grain boundary density, leading to improved ORR activities.

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Keywords

oxygen reduction reactionnanowirepeptidegrain boundaries

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Nano Research
Volume 13 Issue 12,
December 2020
Pages 3310-3314
DOI: 10.1007/s12274-020-3007-2

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Cite this article:
Zhu E, Xue W, Wang S, et al. Enhancement of oxygen reduction reaction activity by grain boundaries in platinum nanostructures. Nano Research, 2020, 13(12): 3310-3314. https://doi.org/10.1007/s12274-020-3007-2
Topics:
Nano unitElectrolytic reduction NanostructuresOxygenOxygen reduction reaction Platinum

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Received: 11 July 2020
Revised: 23 July 2020
Accepted: 23 July 2020
Published: 13 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature