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Support Effects in Single-Atom Platinum Catalysts for Electrochemical Oxygen Reduction
Abstract
Single-atom catalysts (SACs) provide an ideal platform for reducing noble-metal usage. SACs also exhibit unusual catalytic properties due to the absence of a metal surface. The role of the support may have a significant effect on the catalytic properties, similar to that of the ligand molecules in homogeneous catalysts. Here, the support effect was demonstrated by preparing a single-atom platinum catalyst on two different supports: titanium carbide (Pt1/TiC) and titanium nitride (Pt1/TiN). The formation of single-atom Pt was confirmed by STEM, EXAFS, and in situ IR spectroscopy. Pt1/TiC showed higher activity, selectivity, and stability for electrochemical H 2 O 2 production than Pt1/TiN. Density functional theory calculations presented that oxygen species have strong affinity into Pt1/TiN, possibly acting as surface poisoning species, and Pt1/TiC preserves oxygen–oxygen bonds more with higher selectivity toward H 2 O 2 production. This work clearly shows that the support in SACs actively participates in the surface reaction and does not just act as anchoring sites for single atoms.
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Metadata
- Authors
- Yang, S., Tak, Y. J., Kim, J., Soon, A., & Lee, H.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-01-18
- Volume
- 7
- Issue
- 2
- Pages
- 1301-1307
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W2564196652
- Cited by
- 442
- References
- 3
- FWCI
- 9.21
- Type
- journal article
- Language
- en
- Open access
- closed
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