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Metallic NiPS3@NiOOH Core–Shell Heterostructures as Highly Efficient and Stable Electrocatalyst for the Oxygen Evolution Reaction

Konkena, Bharathi, Masa, Justus, Botz, Alexander J. R., Sinev, Ilya, Xia, Wei, Koßmann, Jörg, Drautz, Ralf, Muhler, Martin, Schuhmann, Wolfgang·2017·ACS Catalysis

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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Crossref · 10.1021/acscatal.6b02203

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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
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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