Spin occupancy regulation of the Pt d-orbital for a robust low-Pt catalyst towards oxygen reduction
Zhengzhou University · Hong Kong University of Science and Technology
Abstract
Abstract Disentangling the limitations of O-O bond activation and OH* site-blocking effects on Pt sites is key to improving the intrinsic activity and stability of low-Pt catalysts for the oxygen reduction reaction (ORR). Herein, we integrate of PtFe alloy nanocrystals on a single-atom Fe-N-C substrate (PtFe@Fe SAs -N-C) and further construct a ferromagnetic platform to investigate the regulation behavior of the spin occupancy state of the Pt d -orbital in the ORR. PtFe@Fe SAs -N-C delivers a mass activity of 0.75 A mg Pt −1 at 0.9 V and a peak power density of 1240 mW cm −2 in the fuel-cell, outperforming the commercial Pt/C catalyst, and a mass activity retention of 97%, with no noticeable current drop at…
Citation impact
- FWCI
- 13.38
- Percentile
- 100%
- References
- 65
Authors
9Topics & keywords
- Catalysis
- Spintronics
- HOMO/LUMO
- Chemistry
- Spin states
- Active site
- Substrate (aquarium)
- Materials science