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

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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
Creators:
CreatorsEmailORCIDORCID Put Code
Singh, Ajit KumarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ji, SeulgiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Singh, BaghendraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Das, ChittaranjanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Choi, HeechaeUNSPECIFIEDorcid.org/0000-0002-9390-6607UNSPECIFIED
Menezes, Prashanth W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Indra, ArindamUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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
Uncontrolled Keywords:
KeywordsLanguage
METAL-ORGANIC FRAMEWORK; ELECTROCHEMICAL WATER OXIDATION; X-RAY PHOTOELECTRON; CARBON; HYDROGEN; EFFICIENT; REDUCTION; HYBRID; ELECTROCATALYST; NANOSHEETSMultiple languages
Chemistry, Multidisciplinary; Materials Science, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/59411

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