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Nano Research

Article Title

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

Authors

Enbo Zhu, 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
Wang Xue, Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
Shiyi Wang, Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80309, USA
Xucheng Yan, Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA
Jingxuan Zhou, Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA
Yang Liu, Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA
Jin Cai, Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA
Ershuai Liu, Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
Qingying Jia, Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
Xiangfeng Duan, Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA;California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA
Yujing Li, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Hendrik Heinz, Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80309, USA
Yu Huang, Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA;California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA

Keywords

oxygen reduction reaction, nanowire, peptide, grain boundaries

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.

Publisher

Tsinghua University Press

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