Geometrical effects on ionic diffusion in carbon-carbon symmetric supercapacitors

Wei Sun; Fuqian Yang

doi:10.1002/er.5863

Geometrical effects on ionic diffusion in carbon-carbon symmetric supercapacitors

Wei Sun, Fuqian Yang

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

There is a great need to understand the structural dependence of supercapacitors for the development of advanced electrode materials that can be used to improve the electrochemical performance and structural integrity. In this work, we investigate the effects of the size and pore width/size of activated carbon microspheres (ACMSs) with diameter in a range of 2.7 ± 0.54 to 9.45 ± 1.81 μm and average pore width in a range of 1.60 to 2.0 nm on the electrochemical impedance characteristics of carbon-carbon symmetrical supercapacitors. Both the size and pore width/size of the ACMSs have negligible effects on contact resistance. The activation energy for the migration/diffusion of electrolyte ions in the supercapacitors made from the ACMSs of nearly same porous structure increases nonlinearly with the increase of the average size of the ACMSs, which is likely associated with overscreening effect. The activation energy for the migration/diffusion of electrolyte ions in the supercapacitors made from the ACMSs of nearly same size increases first and then decreases as the pore width/size increases.

Original language	English
Pages (from-to)	12066-12080
Number of pages	15
Journal	International Journal of Energy Research
Volume	44
Issue number	14
DOIs	https://doi.org/10.1002/er.5863
State	Published - Nov 1 2020

Bibliographical note

Publisher Copyright:
© 2020 John Wiley & Sons Ltd

Funding

National Natural Science Foundation of China, Grant/Award Number: 21805123; National Science Foundation, Grant/Award Number: CMMI‐1634540; Talent Scientific Research Fund of LSHU, Grant/Award Number: 2016XJJ‐077; LiaoNing Revitalization Talents Program, Grant/Award Number: XLYC1907067 Funding information Wei Sun is grateful for the support from the National Natural Science Foundation of China (No. 21805123), the LiaoNing Revitalization Talents Program (XLYC1907067), and Talent Scientific Research Fund of LSHU (No. 2016XJJ‐077). Fuqian Yang is grateful for the support from the NSF (CMMI‐1634540), monitored by Drs. Khershed Cooper and Thomas Francis Kuech. Wei Sun is grateful for the support from the National Natural Science Foundation of China (No. 21805123), the LiaoNing Revitalization Talents Program (XLYC1907067), and Talent Scientific Research Fund of LSHU (No. 2016XJJ-077). Fuqian Yang is grateful for the support from the NSF (CMMI-1634540), monitored by Drs. Khershed Cooper and Thomas Francis Kuech.

Funders	Funder number
talent scientific research fund of LSHU
National Science Foundation (NSF)	1634540, CMMI‐1634540
National Natural Science Foundation of China (NSFC)	21805123
Program for Liaoning Innovative Talents in University
Chemical Engineering and Environmental Engineering Liaoning Shihua University	2016XJJ‐077
Liaoning Revitalization Talents Program	XLYC1907067

Keywords

activated carbon microspheres
activation energy
diffusion coefficient
impedance spectroscopy

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Nuclear Energy and Engineering
Fuel Technology
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1002/er.5863

Cite this

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abstract = "There is a great need to understand the structural dependence of supercapacitors for the development of advanced electrode materials that can be used to improve the electrochemical performance and structural integrity. In this work, we investigate the effects of the size and pore width/size of activated carbon microspheres (ACMSs) with diameter in a range of 2.7 ± 0.54 to 9.45 ± 1.81 μm and average pore width in a range of 1.60 to 2.0 nm on the electrochemical impedance characteristics of carbon-carbon symmetrical supercapacitors. Both the size and pore width/size of the ACMSs have negligible effects on contact resistance. The activation energy for the migration/diffusion of electrolyte ions in the supercapacitors made from the ACMSs of nearly same porous structure increases nonlinearly with the increase of the average size of the ACMSs, which is likely associated with overscreening effect. The activation energy for the migration/diffusion of electrolyte ions in the supercapacitors made from the ACMSs of nearly same size increases first and then decreases as the pore width/size increases.",

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Geometrical effects on ionic diffusion in carbon-carbon symmetric supercapacitors

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

Access to Document

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