Improving electrochemical stability and electromechanical efficiency of ipmcs: tuning ionic liquid concentration
In the field of soft actuators, Ionomeric Polymer Metal Composites (IPMC)-like devices are a trend, exhibiting large displacement with low applied voltage. Its working mechanism is related to solvated electrolytes migration, thus the number of counterions exchanged with the polymeric membrane plays a key role in the device’s performance. Although many kinds of inorganic and organic ions were used, there were few efforts to address a specific concentration value of electrolyte solutions. Ionic liquids (ILs) are used in IPMC to provide electrochemical stability; however, their mechanical performance is usually poor. In this study we aimed to determine a specific value of 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) ionic liquid concentration between 0.1, 0.3, and 0.5 mol $ L^{-1} $ that grants electrochemical stability at different relative humidities with best electromechanical efficiency. We synthesized [BMIM]Cl and characterized it through Nuclear Magnetic Resonance (NMR), Fourier Transform Infrared Spectroscopy (FTIR), and Cyclic Voltammetry (CV). The electrochemical behavior of $ Nafion^{®} $/Pt-based IPMC exchanged with IL was studied through Electrochemical Impedance Spectroscopy (EIS), CV, and Chronoamperometry (CA). Electromechanical properties were measured through blocking force and displacement. All the IPMC tests were carried out at three distinct controlled humidities (30%, 60%, and 90%). Herein, we tuned the IL concentration in 0.3 mol $ L^{-1} $, delivering electrochemical stability with the best electromechanical yield regardless of the relative humidity. This result will be important when bringing electrolyte mixtures to further enhance the performance and efficiency of these devices. Graphical abstract.
Medienart: |
E-Artikel |
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Erscheinungsjahr: |
2022 |
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Erschienen: |
2022 |
Enthalten in: |
Zur Gesamtaufnahme - volume:53 |
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Enthalten in: |
Journal of applied electrochemistry - 53(2022), 2 vom: 12. Okt., Seite 241-255 |
Sprache: |
Englisch |
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Beteiligte Personen: |
Tozzi, K. A. [VerfasserIn] |
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Links: |
Volltext [lizenzpflichtig] |
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© The Author(s), under exclusive licence to Springer Nature B.V. 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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doi: |
10.1007/s10800-022-01776-w |
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funding: |
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Förderinstitution / Projekttitel: |
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PPN (Katalog-ID): |
OLC2133493271 |
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520 | |a In the field of soft actuators, Ionomeric Polymer Metal Composites (IPMC)-like devices are a trend, exhibiting large displacement with low applied voltage. Its working mechanism is related to solvated electrolytes migration, thus the number of counterions exchanged with the polymeric membrane plays a key role in the device’s performance. Although many kinds of inorganic and organic ions were used, there were few efforts to address a specific concentration value of electrolyte solutions. Ionic liquids (ILs) are used in IPMC to provide electrochemical stability; however, their mechanical performance is usually poor. In this study we aimed to determine a specific value of 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) ionic liquid concentration between 0.1, 0.3, and 0.5 mol $ L^{-1} $ that grants electrochemical stability at different relative humidities with best electromechanical efficiency. We synthesized [BMIM]Cl and characterized it through Nuclear Magnetic Resonance (NMR), Fourier Transform Infrared Spectroscopy (FTIR), and Cyclic Voltammetry (CV). The electrochemical behavior of $ Nafion^{®} $/Pt-based IPMC exchanged with IL was studied through Electrochemical Impedance Spectroscopy (EIS), CV, and Chronoamperometry (CA). Electromechanical properties were measured through blocking force and displacement. All the IPMC tests were carried out at three distinct controlled humidities (30%, 60%, and 90%). Herein, we tuned the IL concentration in 0.3 mol $ L^{-1} $, delivering electrochemical stability with the best electromechanical yield regardless of the relative humidity. This result will be important when bringing electrolyte mixtures to further enhance the performance and efficiency of these devices. Graphical abstract | ||
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