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Enhancement of oxygen reduction reaction activity by grain boundaries in platinum nanostructures
- Source :
- Nano Research. 13:3310-3314
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
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.
- Subjects :
- Materials science
Nanostructure
Nanowire
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Oxygen
Atomic and Molecular Physics, and Optics
0104 chemical sciences
Catalysis
Chemical engineering
Nanocrystal
chemistry
General Materials Science
Specific activity
Grain boundary
Electrical and Electronic Engineering
0210 nano-technology
Platinum
Subjects
Details
- ISSN :
- 19980000 and 19980124
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Nano Research
- Accession number :
- edsair.doi...........6042c55864d2e1ea0e107a32cc1564ca