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The structure-dependent enhancement of the oxygen reduction reaction performance of Co-based low Pt catalysts through Au addition
- Source :
- Journal of Materials Chemistry A. 4:11023-11029
- Publication Year :
- 2016
- Publisher :
- Royal Society of Chemistry (RSC), 2016.
-
Abstract
- In this study, we have investigated the oxygen reduction reaction (ORR) activity and durability of Co-based catalysts mechanistically. CoPt/C catalysts with a Pt loading of 7 wt% and Au modification have been prepared and shown excellent ORR performance. The various as-prepared CoPt/C and CoPtAu/C catalysts have about 2.6–9.2 times higher mass activity than commercial Pt/C. The mechanistic insight obtained by density functional theory calculations has shown that the enhanced activity is attributable to the fact that Co-based catalysts can easily dissociate surface O2* without the high-barrier protonation step and efficiently remove the dissociated O*. The improved stability, 1000th decay = 14.6%, corresponds to the fact that the core Au can resist the shrinkage of surface Pt during the accelerated durability test.
- Subjects :
- Renewable Energy, Sustainability and the Environment
Chemistry
Nanotechnology
Protonation
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Mass activity
Durability
0104 chemical sciences
Catalysis
Chemical engineering
Oxygen reduction reaction
General Materials Science
Density functional theory
0210 nano-technology
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 4
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry A
- Accession number :
- edsair.doi...........8b9c48495f09892c791dfb248bc53493