Research Article

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2020, 13(12): 3310–3314

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https://doi.org/10.1007/s12274-020-3007-2

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 (✉), and Yu Huang1,6 (✉)

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1 Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA
2 School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
3 Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
4 Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80309, USA
5 Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
6 California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA
§ Enbo Zhu, Wang Xue, and Shiyi Wang contributed equally to this work.

Keywords: oxygen reduction reaction, nanowire, peptide, grain boundaries
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  • Abstract
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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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Enhancement of oxygen reduction reaction activity by grain boundaries in platinum nanostructures. Nano Res. 2020, 13(12): 3310–3314 https://doi.org/10.1007/s12274-020-3007-2

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