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Phenylacetonitrile (C(6)H(5)CH(2)CN) Ionic Liquid Blends as Alternative Electrolytes for Safe and High-Performance Supercapacitors
The increasing need in the development of storage devices is calling for the formulation of alternative electrolytes, electrochemically stable and safe over a wide range of conditions. To achieve this goal, electrolyte chemistry must be explored to propose alternative solvents and salts to the curre...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7321299/ https://www.ncbi.nlm.nih.gov/pubmed/32532028 http://dx.doi.org/10.3390/molecules25112697 |
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author | Ivol, Flavien Porcher, Marina Ghosh, Arunabh Jacquemin, Johan Ghamouss, Fouad |
author_facet | Ivol, Flavien Porcher, Marina Ghosh, Arunabh Jacquemin, Johan Ghamouss, Fouad |
author_sort | Ivol, Flavien |
collection | PubMed |
description | The increasing need in the development of storage devices is calling for the formulation of alternative electrolytes, electrochemically stable and safe over a wide range of conditions. To achieve this goal, electrolyte chemistry must be explored to propose alternative solvents and salts to the current acetonitrile (ACN) and tetraethylammonium tetrafluoroborate (Et(4)NBF(4)) benchmarks, respectively. Herein, phenylacetonitrile (Ph-ACN) has been proposed as a novel alternative solvent to ACN in supercapacitors. To establish the main advantages and drawbacks of such a substitution, Ph-ACN + Et(4)NBF(4) blends were formulated and characterized prior to being compared with the benchmark electrolyte and another alternative electrolyte based on adiponitrile (ADN). While promising results were obtained, the low Et(4)NBF(4) solubility in Ph-ACN seems to be the main limiting factor. To solve such an issue, an ionic liquid (IL), namely 1-ethyl-3-methylimidazolium bis [(trifluoromethyl)sulfonyl] imide (EmimTFSI), was proposed to replace Et(4)NBF(4). Unsurprisingly, the Ph-ACN + EmimTFSI blend was found to be fully miscible over the whole range of composition giving thus the flexibility to optimize the electrolyte formulation over a large range of IL concentrations up to 4.0 M. The electrolyte containing 2.7 M of EmimTFSI in Ph-ACN was identified as the optimized blend thanks to its interesting transport properties. Furthermore, this blend possesses also the prerequisites of a safe electrolyte, with an operating liquid range from at least −60 °C to +130 °C, and operating window of 3.0 V and more importantly, a flash point of 125 °C. Finally, excellent electrochemical performances were observed by using this electrolyte in a symmetric supercapacitor configuration, showing another advantage of mixing an ionic liquid with Ph-ACN. We also supported key structural descriptors by density functional theory (DFT) and COnductor-like Screening Model for Real Solvents (COSMO-RS) calculations, which can be associated to physical and electrochemical properties of the resultant electrolytes. |
format | Online Article Text |
id | pubmed-7321299 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-73212992020-06-29 Phenylacetonitrile (C(6)H(5)CH(2)CN) Ionic Liquid Blends as Alternative Electrolytes for Safe and High-Performance Supercapacitors Ivol, Flavien Porcher, Marina Ghosh, Arunabh Jacquemin, Johan Ghamouss, Fouad Molecules Article The increasing need in the development of storage devices is calling for the formulation of alternative electrolytes, electrochemically stable and safe over a wide range of conditions. To achieve this goal, electrolyte chemistry must be explored to propose alternative solvents and salts to the current acetonitrile (ACN) and tetraethylammonium tetrafluoroborate (Et(4)NBF(4)) benchmarks, respectively. Herein, phenylacetonitrile (Ph-ACN) has been proposed as a novel alternative solvent to ACN in supercapacitors. To establish the main advantages and drawbacks of such a substitution, Ph-ACN + Et(4)NBF(4) blends were formulated and characterized prior to being compared with the benchmark electrolyte and another alternative electrolyte based on adiponitrile (ADN). While promising results were obtained, the low Et(4)NBF(4) solubility in Ph-ACN seems to be the main limiting factor. To solve such an issue, an ionic liquid (IL), namely 1-ethyl-3-methylimidazolium bis [(trifluoromethyl)sulfonyl] imide (EmimTFSI), was proposed to replace Et(4)NBF(4). Unsurprisingly, the Ph-ACN + EmimTFSI blend was found to be fully miscible over the whole range of composition giving thus the flexibility to optimize the electrolyte formulation over a large range of IL concentrations up to 4.0 M. The electrolyte containing 2.7 M of EmimTFSI in Ph-ACN was identified as the optimized blend thanks to its interesting transport properties. Furthermore, this blend possesses also the prerequisites of a safe electrolyte, with an operating liquid range from at least −60 °C to +130 °C, and operating window of 3.0 V and more importantly, a flash point of 125 °C. Finally, excellent electrochemical performances were observed by using this electrolyte in a symmetric supercapacitor configuration, showing another advantage of mixing an ionic liquid with Ph-ACN. We also supported key structural descriptors by density functional theory (DFT) and COnductor-like Screening Model for Real Solvents (COSMO-RS) calculations, which can be associated to physical and electrochemical properties of the resultant electrolytes. MDPI 2020-06-10 /pmc/articles/PMC7321299/ /pubmed/32532028 http://dx.doi.org/10.3390/molecules25112697 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Ivol, Flavien Porcher, Marina Ghosh, Arunabh Jacquemin, Johan Ghamouss, Fouad Phenylacetonitrile (C(6)H(5)CH(2)CN) Ionic Liquid Blends as Alternative Electrolytes for Safe and High-Performance Supercapacitors |
title | Phenylacetonitrile (C(6)H(5)CH(2)CN) Ionic Liquid Blends as Alternative Electrolytes for Safe and High-Performance Supercapacitors |
title_full | Phenylacetonitrile (C(6)H(5)CH(2)CN) Ionic Liquid Blends as Alternative Electrolytes for Safe and High-Performance Supercapacitors |
title_fullStr | Phenylacetonitrile (C(6)H(5)CH(2)CN) Ionic Liquid Blends as Alternative Electrolytes for Safe and High-Performance Supercapacitors |
title_full_unstemmed | Phenylacetonitrile (C(6)H(5)CH(2)CN) Ionic Liquid Blends as Alternative Electrolytes for Safe and High-Performance Supercapacitors |
title_short | Phenylacetonitrile (C(6)H(5)CH(2)CN) Ionic Liquid Blends as Alternative Electrolytes for Safe and High-Performance Supercapacitors |
title_sort | phenylacetonitrile (c(6)h(5)ch(2)cn) ionic liquid blends as alternative electrolytes for safe and high-performance supercapacitors |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7321299/ https://www.ncbi.nlm.nih.gov/pubmed/32532028 http://dx.doi.org/10.3390/molecules25112697 |
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