Journal
NANO RESEARCH
Volume 13, Issue 12, Pages 3310-3314Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-3007-2
Keywords
oxygen reduction reaction; nanowire; peptide; grain boundaries
Categories
Funding
- Office of Naval Research [N000141812491]
- National Science Foundation [ACI-1532235, ACI-1532236, DMREF 1437263, DMREF 1623947, CBET 1530790, OAC 1931587, CMMI 1940335]
- DOE Office of Science User Facility [DE-AC02-06CH11357]
- NSLS-II, Brookhaven National Laboratory, under U.S. DOE [DE-SC0012704]
- U.S. Department of Defense (DOD) [N000141812491] Funding Source: U.S. Department of Defense (DOD)
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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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