Minimizing the electrosorption of water from humid ionic liquids on electrodes
In supercapacitors based on ionic liquid electrolytes, small amounts of absorbed water could potentially reduce the electrochemical window of electrolytes and cause performance degradation. The same would take place if ionic liquids are used as solvents for electrocatalysis involving the dissolved molecular species. In this work, we carry out molecular dynamics simulations, with gold and carbon electrodes in typical ionic liquids, hydrophobic and hydrophilic, to study electrosorption of water. We investigate the effects of hydrophobicity/hydrophilicity of ionic liquids and electrodes on interfacial distribution of ions and electrosorbed water. Results reveal that using hydrophilic ionic liquids would help to keep water molecules away from the negatively charged electrodes, even at large electrode polarizations. This conclusion is supported by electrochemical cyclic voltammetry measurements on gold and carbon electrodes in contact with humid ionic liquids. Thereby, our findings suggest potential mechanisms for protection of electrodes from water electrosorption.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2018 |
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| Erschienen: |
2018 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:9 |
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| Enthalten in: |
Nature communications - 9(2018), 1 vom: 04. Dez., Seite 5222 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Bi, Sheng [VerfasserIn] |
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| Anmerkungen: |
Date Completed 13.12.2018 Date Revised 15.01.2019 published: Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1038/s41467-018-07674-0 |
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| Förderinstitution / Projekttitel: |
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NLM29145528X |
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| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a In supercapacitors based on ionic liquid electrolytes, small amounts of absorbed water could potentially reduce the electrochemical window of electrolytes and cause performance degradation. The same would take place if ionic liquids are used as solvents for electrocatalysis involving the dissolved molecular species. In this work, we carry out molecular dynamics simulations, with gold and carbon electrodes in typical ionic liquids, hydrophobic and hydrophilic, to study electrosorption of water. We investigate the effects of hydrophobicity/hydrophilicity of ionic liquids and electrodes on interfacial distribution of ions and electrosorbed water. Results reveal that using hydrophilic ionic liquids would help to keep water molecules away from the negatively charged electrodes, even at large electrode polarizations. This conclusion is supported by electrochemical cyclic voltammetry measurements on gold and carbon electrodes in contact with humid ionic liquids. Thereby, our findings suggest potential mechanisms for protection of electrodes from water electrosorption | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 700 | 1 | |a Wang, Runxi |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Shuai |e verfasserin |4 aut | |
| 700 | 1 | |a Yan, Jiawei |e verfasserin |4 aut | |
| 700 | 1 | |a Mao, Bingwei |e verfasserin |4 aut | |
| 700 | 1 | |a Kornyshev, Alexei A |e verfasserin |4 aut | |
| 700 | 1 | |a Feng, Guang |e verfasserin |4 aut | |
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