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Metallic NiPS3@NiOOH Core–Shell Heterostructures as Highly Efficient and Stable Electrocatalyst for the Oxygen Evolution Reaction
Abstract
We report metallic NiPS 3 @NiOOH core–shell heterostructures as an efficient and durable electrocatalyst for the oxygen evolution reaction, exhibiting a low onset potential of 1.48 V (vs RHE) and stable performance for over 160 h. The atomically thin NiPS 3 nanosheets are obtained by exfoliation of bulk NiPS 3 in the presence of an ionic surfactant. The OER mechanism was studied by a combination of SECM, in situ Raman spectroscopy, SEM, and XPS measurements, which enabled direct observation of the formation of a NiPS 3 @NiOOH core–shell heterostructure at the electrode interface. Hence, the active form of the catalyst is represented as NiPS 3 @NiOOH core–shell structure. Moreover, DFT calculations indicate an intrinsic metallic character of the NiPS 3 nanosheets with densities of states (DOS) similar to the bulk material. The high OER activity of the NiPS 3 nanosheets is attributed to a high density of accessible active metallic-edge and defect sites due to structural disorder, a unique NiPS 3 @NiOOH core–shell heterostructure, where the presence of P and S modulates the surface electronic structure of Ni in NiPS 3, thus providing excellent conductive pathway for efficient electron-transport to the NiOOH shell. These findings suggest that good size control during liquid exfoliation may be advantageously used for the formation of electrically conductive NiPS 3 @NiOOH core–shell electrode materials for the electrochemical water oxidation.
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Metadata
- Authors
- Konkena, B., Masa, J., Botz, A. J. R., Sinev, I., Xia, W., Koßmann, J., Drautz, R., Muhler, M., & Schuhmann, W.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-12-06
- Volume
- 7
- Issue
- 1
- Pages
- 229-237
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W2555698350
- Cited by
- 292
- References
- 43
- FWCI
- 8.40
- Type
- journal article
- Language
- en
- Open access
- closed
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