Singh, Ajit Kumar, Ji, Seulgi, Singh, Baghendra, Das, Chittaranjan, Choi, Heechae ORCID: 0000-0002-9390-6607, Menezes, Prashanth W. and Indra, Arindam (2022). Alkaline oxygen evolution: exploring synergy between fcc and hcp cobalt nanoparticles entrapped in N-doped graphene. Mater. Today Chem., 23. OXFORD: ELSEVIER SCI LTD. ISSN 2468-5194
Full text not available from this repository.Abstract
Herein, we report a Mott-Schottky catalyst by entrapping cobalt nanoparticles inside the N-doped graphene shell (Co@NC). The Co@NC delivered excellent oxygen evolution activity with an overpotential of merely 248 mV at a current density of 10 mA cm(-2) with promising long-term stability. The importance of Co encapsulated in NC has further been demonstrated by synthesizing Co nanoparticles without NC shell. The synergy between the hexagonal close-packed (hcp) and face-centered cubic (fcc) Co plays a major role to improve the OER activity, whereas the NC shell optimizes the electronic structure, improves the electron conductivity, and offers a large number of active sites in Co@NC. The density functional theory calculations have revealed that the hcp Co has a dominant role in the surface reaction of electrocatalytic oxygen evolution, whereas the fcc phase induces the built-in electric field at the interfaces with N-doped graphene to accelerate the H+ ion transport. (C) 2021 Elsevier Ltd. All rights reserved.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-594114 | ||||||||||||||||||||||||||||||||
DOI: | 10.1016/j.mtchem.2021.100668 | ||||||||||||||||||||||||||||||||
Journal or Publication Title: | Mater. Today Chem. | ||||||||||||||||||||||||||||||||
Volume: | 23 | ||||||||||||||||||||||||||||||||
Date: | 2022 | ||||||||||||||||||||||||||||||||
Publisher: | ELSEVIER SCI LTD | ||||||||||||||||||||||||||||||||
Place of Publication: | OXFORD | ||||||||||||||||||||||||||||||||
ISSN: | 2468-5194 | ||||||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||||||
Faculty: | Unspecified | ||||||||||||||||||||||||||||||||
Divisions: | Unspecified | ||||||||||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||||||||||
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URI: | http://kups.ub.uni-koeln.de/id/eprint/59411 |
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