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Understanding ageing mechanisms of porous carbons in non-aqueous electrolytes for supercapacitors applications

Liu, Yinghui and Réty, Bénédicte and Matei Ghimbeu, Camélia and Soucaze-Guillous, Benoît and Taberna, Pierre-Louis and Simon, Patrice Understanding ageing mechanisms of porous carbons in non-aqueous electrolytes for supercapacitors applications. (2019) Journal of Power Sources, 434. 226734. ISSN 0378-7753

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Official URL: https://doi.org/10.1016/j.jpowsour.2019.226734

Abstract

Two activated porous carbon powders with different surface functional groups content have been electrochemically polarized in tetraethylammonium tetrafluoborate (Et4NBF4) in acetonitrile electrolyte to study their ageing mechanism as supercapacitor electrodes. Temperature-programmed desorption coupled with mass spectrometry technique (TPD-MS) is used to track the change of carbon surface chemistry – surface functional groups and/or adsorption of degradation products occurring upon polarizations. A potentiostatic study of the carbons in a two-compartment cell unveil the catalytic role of water in the ageing mechanism. Combining these results with our previous work, we propose different scenarios to depict the ageing mechanisms of the two carbons. For carbon A, hydrolysis of BF4− at the positive electrode leads to carbon oxidation together with soluble poly-acetonitrile oligomer occurred from reaction between BF4• radicals and acetonitrile. Ageing mechanism is also assumed to set off with the hydrolysis of BF4− for carbon B; but, in here the formed oligomers react with acid functional groups present at the carbon surface to form a protective, passive-like layer at both positive and negative electrodes which hampers a further electrode ageing.

Item Type:Article
HAL Id:hal-02383704
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Aix-Marseille Université - AMU (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Collège de France (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Paris - ENSCP (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
Other partners > Institut universitaire de France - IUF (FRANCE)
Other partners > Sorbonne Université (FRANCE)
Other partners > Université de Strasbourg - UNISTRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Nantes (FRANCE)
Other partners > Université de Picardie Jules Verne (FRANCE)
Other partners > Renault SAS (FRANCE)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
Other partners > Université de Haute Alsace - UHA (FRANCE)
Other partners > Université de Montpellier (FRANCE)
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Deposited On:27 Mar 2020 09:39

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