In-Situ Electrochemically Activated Surface Vanadium Valence in V<inf>2</inf>C MXene to Achieve High Capacity and Superior Rate Performance for Zn-Ion Batteries

Liu, Y; Jiang, Y; Hu, Z; Peng, J; Lai, W; Wu, D; Zuo, S; Zhang, J; Chen, B; Dai, Z; Yang, Y; Huang, Y; Zhang, W; Zhao, W; Zhang, W; Wang, L; Chou, S

In-Situ Electrochemically Activated Surface Vanadium Valence in V<inf>2</inf>C MXene to Achieve High Capacity and Superior Rate Performance for Zn-Ion Batteries

Liu, Y Jiang, Y Hu, Z Peng, J Lai, W

Wu, D Zuo, S Zhang, J Chen, B Dai, Z Yang, Y Huang, Y Zhang, W Zhao, W Zhang, W Wang, L Chou, S

Permalink

Publisher:: Wiley
Publication Type:: Journal Article
Citation:: Advanced Functional Materials, 2021, 31, (8)
Issue Date:: 2021

Closed Access

	Filename	Description	Size
	Adv Funct Materials - 2020 - Liu - In‐Situ Electrochemically Activated Surface Vanadium Valence in V2C MXene to Achieve.pdf	Published version	9.25 MB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Liu, Y
dc.contributor.author	Jiang, Y
dc.contributor.author	Hu, Z
dc.contributor.author	Peng, J
dc.contributor.author	Lai, W https://orcid.org/0000-0002-8685-9662
dc.contributor.author	Wu, D
dc.contributor.author	Zuo, S
dc.contributor.author	Zhang, J
dc.contributor.author	Chen, B
dc.contributor.author	Dai, Z
dc.contributor.author	Yang, Y
dc.contributor.author	Huang, Y
dc.contributor.author	Zhang, W
dc.contributor.author	Zhao, W
dc.contributor.author	Zhang, W
dc.contributor.author	Wang, L
dc.contributor.author	Chou, S
dc.date.accessioned	2022-02-09T03:25:40Z
dc.date.available	2022-02-09T03:25:40Z
dc.date.issued	2021
dc.identifier.citation	Advanced Functional Materials, 2021, 31, (8)
dc.identifier.issn	1616-301X
dc.identifier.issn	1616-3028
dc.identifier.uri	http://hdl.handle.net/10453/154330
dc.description.abstract	© 2020 Wiley-VCH GmbH Vanadium-based materials are fascinating potential cathodes for high energy density Zn-ion batteries (ZIBs), due to their high capacity arising from multi-electron redox chemistry. Most vanadium-based materials suffer from poor rate capability, however, owing to their low conductivity and large dimension. Here, we propose the application of V2C MXene (V2CTx), a conductive 2D nanomaterial, for achieving high energy density ZIBs with superior rate capability. Through an initial charging activation, the valence of surface vanadium in V2CTx cathode is raised significantly from V2+/V3+ to V4+/V5+, forming a nanoscale vanadium oxide (VOx) coating that effectively undergoes multi-electron reactions, whereas the inner V-C-V 2D multi-layers of V2CTx are intentionally preserved, providing abundant nanochannels with intrinsic high conductivity. Owing to the synergistic effects between the outer high-valence VOx and inner conductive V-C-V, the activated V2CTx presents an ultrahigh rate performance, reaching 358 mAh g−1 at 30 A g−1, together with remarkable energy and power density (318 Wh kg−1/22.5 kW kg−1). The structural advantages of activated V2CTx are maintained after 2000 cycles, offering excellent stability with nearly 100% Coulombic efficiency. This work provides key insights into the design of high-performance cathode materials for advanced ZIBs.
dc.language	English
dc.publisher	Wiley
dc.relation.ispartof	Advanced Functional Materials
dc.relation.isbasedon	10.1002/adfm.202008033
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	02 Physical Sciences, 03 Chemical Sciences, 09 Engineering
dc.subject.classification	Materials
dc.title	In-Situ Electrochemically Activated Surface Vanadium Valence in V<inf>2</inf>C MXene to Achieve High Capacity and Superior Rate Performance for Zn-Ion Batteries
dc.type	Journal Article
utslib.citation.volume	31
utslib.for	02 Physical Sciences
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
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
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-02-09T03:25:34Z
pubs.issue	8
pubs.publication-status	Published
pubs.volume	31
utslib.citation.issue	8

Abstract:

© 2020 Wiley-VCH GmbH Vanadium-based materials are fascinating potential cathodes for high energy density Zn-ion batteries (ZIBs), due to their high capacity arising from multi-electron redox chemistry. Most vanadium-based materials suffer from poor rate capability, however, owing to their low conductivity and large dimension. Here, we propose the application of V2C MXene (V2CTx), a conductive 2D nanomaterial, for achieving high energy density ZIBs with superior rate capability. Through an initial charging activation, the valence of surface vanadium in V2CTx cathode is raised significantly from V2+/V3+ to V4+/V5+, forming a nanoscale vanadium oxide (VOx) coating that effectively undergoes multi-electron reactions, whereas the inner V-C-V 2D multi-layers of V2CTx are intentionally preserved, providing abundant nanochannels with intrinsic high conductivity. Owing to the synergistic effects between the outer high-valence VOx and inner conductive V-C-V, the activated V2CTx presents an ultrahigh rate performance, reaching 358 mAh g−1 at 30 A g−1, together with remarkable energy and power density (318 Wh kg−1/22.5 kW kg−1). The structural advantages of activated V2CTx are maintained after 2000 cycles, offering excellent stability with nearly 100% Coulombic efficiency. This work provides key insights into the design of high-performance cathode materials for advanced ZIBs.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/154330