Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry

Li, Y; Yang, W; Yang, W; Wang, Z; Rong, J; Wang, G; Xu, C; Kang, F; Dong, L

Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry

Li, Y Yang, W Yang, W Wang, Z Rong, J Wang, G

Xu, C Kang, F Dong, L

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Publisher:: Open Access House of Science and Technology
Publication Type:: Journal Article
Citation:: Nano-Micro Letters, 2021, 13, (1), pp. 1-16
Issue Date:: 2021-03-18

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Field	Value	Language
dc.contributor.author	Li, Y
dc.contributor.author	Yang, W
dc.contributor.author	Yang, W
dc.contributor.author	Wang, Z
dc.contributor.author	Rong, J
dc.contributor.author	Wang, G https://orcid.org/0000-0003-4295-8578
dc.contributor.author	Xu, C
dc.contributor.author	Kang, F
dc.contributor.author	Dong, L
dc.date.accessioned	2022-02-08T02:16:32Z
dc.date.available	2021-02-20
dc.date.available	2022-02-08T02:16:32Z
dc.date.issued	2021-03-18
dc.identifier.citation	Nano-Micro Letters, 2021, 13, (1), pp. 1-16
dc.identifier.issn	2150-5551
dc.identifier.issn	2150-5551
dc.identifier.uri	http://hdl.handle.net/10453/154266
dc.description.abstract	Aqueous Zn-ion hybrid supercapacitors (ZHSs) are increasingly being studied as a novel electrochemical energy storage system with prominent electrochemical performance, high safety and low cost. Herein, high-energy and anti-self-discharge ZHSs are realized based on the fibrous carbon cathodes with hierarchically porous surface and O/N heteroatom functional groups. Hierarchically porous surface of the fabricated free-standing fibrous carbon cathodes not only provides abundant active sites for divalent ion storage, but also optimizes ion transport kinetics. Consequently, the cathodes show a high gravimetric capacity of 156 mAh g−1, superior rate capability (79 mAh g−1 with a very short charge/discharge time of 14 s) and exceptional cycling stability. Meanwhile, hierarchical pore structure and suitable surface functional groups of the cathodes endow ZHSs with a high energy density of 127 Wh kg−1, a high power density of 15.3 kW kg−1 and good anti-self-discharge performance. Mechanism investigation reveals that ZHS electrochemistry involves cation adsorption/desorption and Zn4SO4(OH)6·5H2O formation/dissolution at low voltage and anion adsorption/desorption at high voltage on carbon cathodes. The roles of these reactions in energy storage of ZHSs are elucidated. This work not only paves a way for high-performance cathode materials of ZHSs, but also provides a deeper understanding of ZHS electrochemistry.
dc.format	Electronic
dc.language	eng
dc.publisher	Open Access House of Science and Technology
dc.relation.ispartof	Nano-Micro Letters
dc.relation.isbasedon	10.1007/s40820-021-00625-3
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry
dc.type	Journal Article
utslib.citation.volume	13
utslib.location.activity	Germany
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	open_access	*
pubs.consider-herdc	false
dc.date.updated	2022-02-08T02:16:26Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	13
utslib.citation.issue	1

Abstract:

Aqueous Zn-ion hybrid supercapacitors (ZHSs) are increasingly being studied as a novel electrochemical energy storage system with prominent electrochemical performance, high safety and low cost. Herein, high-energy and anti-self-discharge ZHSs are realized based on the fibrous carbon cathodes with hierarchically porous surface and O/N heteroatom functional groups. Hierarchically porous surface of the fabricated free-standing fibrous carbon cathodes not only provides abundant active sites for divalent ion storage, but also optimizes ion transport kinetics. Consequently, the cathodes show a high gravimetric capacity of 156 mAh g−1, superior rate capability (79 mAh g−1 with a very short charge/discharge time of 14 s) and exceptional cycling stability. Meanwhile, hierarchical pore structure and suitable surface functional groups of the cathodes endow ZHSs with a high energy density of 127 Wh kg−1, a high power density of 15.3 kW kg−1 and good anti-self-discharge performance. Mechanism investigation reveals that ZHS electrochemistry involves cation adsorption/desorption and Zn4SO4(OH)6·5H2O formation/dissolution at low voltage and anion adsorption/desorption at high voltage on carbon cathodes. The roles of these reactions in energy storage of ZHSs are elucidated. This work not only paves a way for high-performance cathode materials of ZHSs, but also provides a deeper understanding of ZHS electrochemistry.

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http://hdl.handle.net/10453/154266