An Insight into the Mechanisms of Energy Storage in a Double Layer Capacitor with ILs and a Microporous Carbon: Experimental Evidences of Ion-Swapping by Electrochemical Impedance Spectroscopy
The energy storage mechanism operating in carbon-based supercapacitors using ionic liquids as electrolytes is not yet fully understood. In this paper, the interactions of ions of two widely used ionic liquids, i.e. EMImTFSI and EMImBF4, with a high specific surface area microporous carbon are investigated. Galvanostatic cycling experiments performed on each electrode and in the full cell demonstrate that a specific energy close to 46 Wh kg-1 can be achieved with this carbon. More interestingly, impedance spectroscopy studies reveal the presence of some unusual behavior, such as the presence of inductive elements in some of the electrodes, either in the positive or in the negative electrode. These inductive elements are identified, for the first time, as another type of possible experimental evidences of some phenomena previously proposed, such as ion-swapping or co-ions desorption, both phenomena leading to the formation of the superionic state.
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Institute of Physics (Great Britain)
2023-04-01
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Subjects: | Ensure access to affordable, reliable, sustainable and modern energy for all, Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation, |
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dig-incar-es-10261-3499572024-03-11T21:48:35Z An Insight into the Mechanisms of Energy Storage in a Double Layer Capacitor with ILs and a Microporous Carbon: Experimental Evidences of Ion-Swapping by Electrochemical Impedance Spectroscopy Quintanal Mera, Noemí Barreda García, Daniel Blanco Rodríguez, Clara González Arias, Zoraida Álvarez Rodríguez, Patricia Granda Ferreira, Marcos Sevilla Solís, Marta Santamaría Ramírez, Ricardo Ministerio de Ciencia, Innovación y Universidades (España) Principado de Asturias Santamaría Ramírez, Ricardo [0000-0001-9818-6998] Rodríguez Blanco, Clara [0000-0002-0922-1980] González Arias, Zoraida [0000-0001-8932-3671] Álvarez Rodríguez, Patricia [0000-0001-9676-0546] Granda Ferreira, Marcos [0000-0001-7479-0445] Sevilla Solís, Marta [0000-0002-2471-2403] Ensure access to affordable, reliable, sustainable and modern energy for all Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation The energy storage mechanism operating in carbon-based supercapacitors using ionic liquids as electrolytes is not yet fully understood. In this paper, the interactions of ions of two widely used ionic liquids, i.e. EMImTFSI and EMImBF4, with a high specific surface area microporous carbon are investigated. Galvanostatic cycling experiments performed on each electrode and in the full cell demonstrate that a specific energy close to 46 Wh kg-1 can be achieved with this carbon. More interestingly, impedance spectroscopy studies reveal the presence of some unusual behavior, such as the presence of inductive elements in some of the electrodes, either in the positive or in the negative electrode. These inductive elements are identified, for the first time, as another type of possible experimental evidences of some phenomena previously proposed, such as ion-swapping or co-ions desorption, both phenomena leading to the formation of the superionic state. The authors acknowledge Ministerio de Ciencia, Innovación y Universidades for financial support (project MAT2016–77114-R and the predoctoral contract of Noemí Quintanal, BES-2017–082038). Authors would also thank Principado de Asturias (FICYT, Ayudas a grupos de investigación para actividades de I+D+i 2021–2023, AYUD/2021/50249) for its financial support. Peer reviewed 2024-03-11T12:44:18Z 2024-03-11T12:44:18Z 2023-04-01 artículo Journal of the Electrochemical Society 170(4): 040528 (2023) 0013-4651 http://hdl.handle.net/10261/349957 10.1149/1945-7111/acce73 2-s2.0-85158820605 https://api.elsevier.com/content/abstract/scopus_id/85158820605 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MCIUN//MAT2016–77114-R Journal of the Electrochemical Society Publisher's version https://doi.org/10.1149/1945-7111/acce73 Sí open Institute of Physics (Great Britain) |
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Ensure access to affordable, reliable, sustainable and modern energy for all Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation Ensure access to affordable, reliable, sustainable and modern energy for all Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation |
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Ensure access to affordable, reliable, sustainable and modern energy for all Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation Ensure access to affordable, reliable, sustainable and modern energy for all Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation Quintanal Mera, Noemí Barreda García, Daniel Blanco Rodríguez, Clara González Arias, Zoraida Álvarez Rodríguez, Patricia Granda Ferreira, Marcos Sevilla Solís, Marta Santamaría Ramírez, Ricardo An Insight into the Mechanisms of Energy Storage in a Double Layer Capacitor with ILs and a Microporous Carbon: Experimental Evidences of Ion-Swapping by Electrochemical Impedance Spectroscopy |
description |
The energy storage mechanism operating in carbon-based supercapacitors using ionic liquids as electrolytes is not yet fully understood. In this paper, the interactions of ions of two widely used ionic liquids, i.e. EMImTFSI and EMImBF4, with a high specific surface area microporous carbon are investigated. Galvanostatic cycling experiments performed on each electrode and in the full cell demonstrate that a specific energy close to 46 Wh kg-1 can be achieved with this carbon. More interestingly, impedance spectroscopy studies reveal the presence of some unusual behavior, such as the presence of inductive elements in some of the electrodes, either in the positive or in the negative electrode. These inductive elements are identified, for the first time, as another type of possible experimental evidences of some phenomena previously proposed, such as ion-swapping or co-ions desorption, both phenomena leading to the formation of the superionic state. |
author2 |
Ministerio de Ciencia, Innovación y Universidades (España) |
author_facet |
Ministerio de Ciencia, Innovación y Universidades (España) Quintanal Mera, Noemí Barreda García, Daniel Blanco Rodríguez, Clara González Arias, Zoraida Álvarez Rodríguez, Patricia Granda Ferreira, Marcos Sevilla Solís, Marta Santamaría Ramírez, Ricardo |
format |
artículo |
topic_facet |
Ensure access to affordable, reliable, sustainable and modern energy for all Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation |
author |
Quintanal Mera, Noemí Barreda García, Daniel Blanco Rodríguez, Clara González Arias, Zoraida Álvarez Rodríguez, Patricia Granda Ferreira, Marcos Sevilla Solís, Marta Santamaría Ramírez, Ricardo |
author_sort |
Quintanal Mera, Noemí |
title |
An Insight into the Mechanisms of Energy Storage in a Double Layer Capacitor with ILs and a Microporous Carbon: Experimental Evidences of Ion-Swapping by Electrochemical Impedance Spectroscopy |
title_short |
An Insight into the Mechanisms of Energy Storage in a Double Layer Capacitor with ILs and a Microporous Carbon: Experimental Evidences of Ion-Swapping by Electrochemical Impedance Spectroscopy |
title_full |
An Insight into the Mechanisms of Energy Storage in a Double Layer Capacitor with ILs and a Microporous Carbon: Experimental Evidences of Ion-Swapping by Electrochemical Impedance Spectroscopy |
title_fullStr |
An Insight into the Mechanisms of Energy Storage in a Double Layer Capacitor with ILs and a Microporous Carbon: Experimental Evidences of Ion-Swapping by Electrochemical Impedance Spectroscopy |
title_full_unstemmed |
An Insight into the Mechanisms of Energy Storage in a Double Layer Capacitor with ILs and a Microporous Carbon: Experimental Evidences of Ion-Swapping by Electrochemical Impedance Spectroscopy |
title_sort |
insight into the mechanisms of energy storage in a double layer capacitor with ils and a microporous carbon: experimental evidences of ion-swapping by electrochemical impedance spectroscopy |
publisher |
Institute of Physics (Great Britain) |
publishDate |
2023-04-01 |
url |
http://hdl.handle.net/10261/349957 https://api.elsevier.com/content/abstract/scopus_id/85158820605 |
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