Skip to Main content Skip to Navigation
Journal articles

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

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.
Complete list of metadatas

Cited literature [27 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-02383704
Contributor : Adeline Rege <>
Submitted on : Friday, March 27, 2020 - 10:39:29 AM
Last modification on : Friday, April 3, 2020 - 1:10:38 AM
Long-term archiving on: : Sunday, June 28, 2020 - 1:21:40 PM

File

Liu_25595.pdf
Files produced by the author(s)

Identifiers

Citation

Yinghui Liu, Bénédicte Réty, Camelia Ghimbeu, Benoît Soucaze-Guillous, Pierre-Louis Taberna, et al.. Understanding ageing mechanisms of porous carbons in non-aqueous electrolytes for supercapacitors applications. Journal of Power Sources, Elsevier, 2019, 434, pp.226734. ⟨10.1016/j.jpowsour.2019.226734⟩. ⟨hal-02383704⟩

Share

Metrics

Record views

213

Files downloads

199