Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic Liquid
The electrochemical behaviour of Al, used as a current collector in supercapacitors and in Li-ion and Na-ion electrochemical power sources, was investigated for the first time using the in situ soft X-ray photoelectron spectroscopy (XPS) method, collecting the information directly at the electrolyte...
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MDPI AG
2023-03-01
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| author | Jaanus Kruusma Tanel Käämbre Arvo Tõnisoo Vambola Kisand Karmen Lust Enn Lust |
| author_facet | Jaanus Kruusma Tanel Käämbre Arvo Tõnisoo Vambola Kisand Karmen Lust Enn Lust |
| author_sort | Jaanus Kruusma |
| collection | DOAJ |
| description | The electrochemical behaviour of Al, used as a current collector in supercapacitors and in Li-ion and Na-ion electrochemical power sources, was investigated for the first time using the in situ soft X-ray photoelectron spectroscopy (XPS) method, collecting the information directly at the electrolyte-covered Al current collector polarised electrochemically at high anodic potentials. Cyclic voltammetry, electrochemical impedance spectroscopy, and synchrotron in situ soft XPS methods were applied to collect physical and electrochemical information characterising the electrochemically polarised Al-current-collector RTIL interface soaked into the butyltrimethylammonium bis(trifluoromethylsulfonyl)imide (N4111(TFSI)) room-temperature ionic liquid. The obtained data show the start of intensive oxidation processes, including aluminium oxidation and the formation of an insoluble Al(TFSI)<sub>3</sub> surface layer in N4111(TFSI) at <i>E</i> ≥ 3.0 V (vs. Ag-QRE). Very intensive electro-oxidation of TFSI<sup>−</sup> anions at <i>E</i> ≥ 6.5 V (vs. Ag-QRE) has been observed. CV data indicate that the electrochemical oxidation of once-activated Al is possible in N4111(TFSI) at 1.1 V < <i>E</i> < 1.6 V (vs. Ag-QRE). Therefore, the oxidation of Al starts at <i>E</i> ≥ 2.05 V (vs. Ag-QRE) if the Al surface is modified with electro-oxidation products of TFSI<sup>−</sup> anions. |
| first_indexed | 2024-03-11T06:55:46Z |
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| language | English |
| last_indexed | 2024-03-11T06:55:46Z |
| publishDate | 2023-03-01 |
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| spelling | doaj.art-bb96c1b4992a465e8efec3335a8eec822023-11-17T09:36:31ZengMDPI AGBatteries2313-01052023-03-019318910.3390/batteries9030189Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic LiquidJaanus Kruusma0Tanel Käämbre1Arvo Tõnisoo2Vambola Kisand3Karmen Lust4Enn Lust5Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, EstoniaInstitute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, EstoniaInstitute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, EstoniaInstitute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, EstoniaInstitute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, EstoniaInstitute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, EstoniaThe electrochemical behaviour of Al, used as a current collector in supercapacitors and in Li-ion and Na-ion electrochemical power sources, was investigated for the first time using the in situ soft X-ray photoelectron spectroscopy (XPS) method, collecting the information directly at the electrolyte-covered Al current collector polarised electrochemically at high anodic potentials. Cyclic voltammetry, electrochemical impedance spectroscopy, and synchrotron in situ soft XPS methods were applied to collect physical and electrochemical information characterising the electrochemically polarised Al-current-collector RTIL interface soaked into the butyltrimethylammonium bis(trifluoromethylsulfonyl)imide (N4111(TFSI)) room-temperature ionic liquid. The obtained data show the start of intensive oxidation processes, including aluminium oxidation and the formation of an insoluble Al(TFSI)<sub>3</sub> surface layer in N4111(TFSI) at <i>E</i> ≥ 3.0 V (vs. Ag-QRE). Very intensive electro-oxidation of TFSI<sup>−</sup> anions at <i>E</i> ≥ 6.5 V (vs. Ag-QRE) has been observed. CV data indicate that the electrochemical oxidation of once-activated Al is possible in N4111(TFSI) at 1.1 V < <i>E</i> < 1.6 V (vs. Ag-QRE). Therefore, the oxidation of Al starts at <i>E</i> ≥ 2.05 V (vs. Ag-QRE) if the Al surface is modified with electro-oxidation products of TFSI<sup>−</sup> anions.https://www.mdpi.com/2313-0105/9/3/189aluminium current collectorroom-temperature ionic liquidin situ X-ray photoelectron spectroscopyelectrochemical impedance spectroscopycyclic voltammetry |
| spellingShingle | Jaanus Kruusma Tanel Käämbre Arvo Tõnisoo Vambola Kisand Karmen Lust Enn Lust Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic Liquid Batteries aluminium current collector room-temperature ionic liquid in situ X-ray photoelectron spectroscopy electrochemical impedance spectroscopy cyclic voltammetry |
| title | Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic Liquid |
| title_full | Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic Liquid |
| title_fullStr | Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic Liquid |
| title_full_unstemmed | Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic Liquid |
| title_short | Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic Liquid |
| title_sort | investigation of the electrochemical behaviour of al current collector material polarised highly anodically and located in butyltrimethylammonium bis trifluoromethylsulfonyl imide room temperature ionic liquid |
| topic | aluminium current collector room-temperature ionic liquid in situ X-ray photoelectron spectroscopy electrochemical impedance spectroscopy cyclic voltammetry |
| url | https://www.mdpi.com/2313-0105/9/3/189 |
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