Cobalt-doped MnO<inf>2</inf> ultrathin nanosheets with abundant oxygen vacancies supported on functionalized carbon nanofibers for efficient oxygen evolution

Zhao, Y; Zhang, J; Wu, W; Guo, X; Xiong, P; Liu, H; Wang, G

Cobalt-doped MnO<inf>2</inf> ultrathin nanosheets with abundant oxygen vacancies supported on functionalized carbon nanofibers for efficient oxygen evolution

Zhao, Y

Zhang, J

Wu, W Guo, X

Xiong, P

Liu, H

Wang, G

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Publication Type:: Journal Article
Citation:: Nano Energy, 2018, 54 pp. 129 - 137
Issue Date:: 2018-12-01

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Field	Value	Language
dc.contributor.author	Zhao, Y https://orcid.org/0000-0002-8653-8666	en_US
dc.contributor.author	Zhang, J https://orcid.org/0000-0001-5476-0134	en_US
dc.contributor.author	Wu, W	en_US
dc.contributor.author	Guo, X https://orcid.org/0000-0001-7771-0463	en_US
dc.contributor.author	Xiong, P https://orcid.org/0000-0001-9483-6535	en_US
dc.contributor.author	Liu, H https://orcid.org/0000-0003-0266-9472	en_US
dc.contributor.author	Wang, G https://orcid.org/0000-0003-4295-8578	en_US
dc.date.issued	2018-12-01	en_US
dc.identifier.citation	Nano Energy, 2018, 54 pp. 129 - 137	en_US
dc.identifier.issn	2211-2855	en_US
dc.identifier.uri	http://hdl.handle.net/10453/128425
dc.description.abstract	© 2018 Elsevier Ltd Developing low-cost and efficient catalysts for oxygen evolution reactions (OER) with both excellent activity and robust stability remains a great challenge. Herein, we report a facile spontaneous redox reaction to grow cobalt-doped MnO2 ultrathin nanosheets in situ with abundant oxygen vacancies vertically aligned on cobalt/nitrogen co-functionalized carbon nanofibers (Co-MnO2\|OV) as an efficient OER catalyst. It is confirmed that metallic cobalt plays a critical role in the formation of long and ultrathin MnO2 nanosheets during the redox reaction. Furthermore, the cobalt ions doped into MnO2 significantly enhance the catalytic activity of MnO2 nanosheets. Benefiting from the collaborative advantages of doping strategy, fast charge transfer kinetics and strong synergistic coupling effects, Co-MnO2\|OV composites exhibit an excellent catalytic activity and a good durability for electrochemical water oxidation, reaching 10 mA cm−2 at an overpotential of 279 mV. According to the density functional theory (DFT) calculations, the enhanced catalytic activity mainly originates from a better conductivity and the decreased adsorption energy barrier of OH- on the O sites neighboring the doped Co and oxygen vacancies. Our findings suggest that the control over the structure and composition of the materials can achieve highly efficient oxygen evolution electrocatalysts.	en_US
dc.relation	http://purl.org/au-research/grants/arc/LE180100129
dc.relation.ispartof	Nano Energy	en_US
dc.relation.isbasedon	10.1016/j.nanoen.2018.10.008	en_US
dc.title	Cobalt-doped MnO<inf>2</inf> ultrathin nanosheets with abundant oxygen vacancies supported on functionalized carbon nanofibers for efficient oxygen evolution	en_US
dc.type	Journal Article
utslib.citation.volume	54	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	1007 Nanotechnology	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	54	en_US

Abstract:

© 2018 Elsevier Ltd Developing low-cost and efficient catalysts for oxygen evolution reactions (OER) with both excellent activity and robust stability remains a great challenge. Herein, we report a facile spontaneous redox reaction to grow cobalt-doped MnO2 ultrathin nanosheets in situ with abundant oxygen vacancies vertically aligned on cobalt/nitrogen co-functionalized carbon nanofibers (Co-MnO2|OV) as an efficient OER catalyst. It is confirmed that metallic cobalt plays a critical role in the formation of long and ultrathin MnO2 nanosheets during the redox reaction. Furthermore, the cobalt ions doped into MnO2 significantly enhance the catalytic activity of MnO2 nanosheets. Benefiting from the collaborative advantages of doping strategy, fast charge transfer kinetics and strong synergistic coupling effects, Co-MnO2|OV composites exhibit an excellent catalytic activity and a good durability for electrochemical water oxidation, reaching 10 mA cm−2 at an overpotential of 279 mV. According to the density functional theory (DFT) calculations, the enhanced catalytic activity mainly originates from a better conductivity and the decreased adsorption energy barrier of OH- on the O sites neighboring the doped Co and oxygen vacancies. Our findings suggest that the control over the structure and composition of the materials can achieve highly efficient oxygen evolution electrocatalysts.

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http://hdl.handle.net/10453/128425