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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Acknowledgements
E. Z. and Y. H. acknowledge the Electron Imaging Center of Nanomachines at University of California, Los Angeles for TEM support. Y. H. acknowledges support from the Office of Naval Research under grant number N000141812491 and National Science Foundation DMREF 1437263. S. W. and H. H. acknowledge support by the National Science Foundation (DMREF 1623947, CBET 1530790, OAC 1931587, and CMMI 1940335). The allocation of computational resources is acknowledged at the Argonne Leadership Computing Facility, which is a DOE Office of Science User Facility supported under contract DE-AC02-06CH11357, and at the Summit supercomputer supported by the National Science Foundation (ACI-1532235 and ACI-1532236). The authors declare no competing financial interests. Use of beamline ISS 8-ID of the National Synchrotron Light Source (NSLS) II was supported by the NSLS-II, Brookhaven National Laboratory, under U.S. DOE Contract No. DE-SC0012704.
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Zhu, E., Xue, W., Wang, S. et al. Enhancement of oxygen reduction reaction activity by grain boundaries in platinum nanostructures. Nano Res. 13, 3310–3314 (2020). https://doi.org/10.1007/s12274-020-3007-2
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DOI: https://doi.org/10.1007/s12274-020-3007-2