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Anothumakkool, B., Sayed-Ahmad-Baraza, Y., Massuyeau, F., Brousse, T., Ewels, C. & Gaubicher, J. (2021) Experimental and Theoretical Study of the Effect of Functionalized Pyrene Polymerization on Carbon Electrode Surfaces for Electrochemical Storage. Batteries Supercaps, 4 1018–1031. 
Added by: Richard Baschera (2021-11-26 11:14:58)   Last edited by: Richard Baschera (2021-11-26 11:16:04)
Type de référence: Article
DOI: 10.1002/batt.202000329
Clé BibTeX: Anothumakkool2021
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Mots-clés: adsorption mechanism, Density functional theory, electropolymerization mechanism, Li metal hybrid supercapacitor, pyrene
Créateurs: Anothumakkool, Brousse, Ewels, Gaubicher, Massuyeau, Sayed-Ahmad-Baraza
Collection: Batteries Supercaps
Consultations : 10/234
Indice de consultation : 9%
Indice de popularité : 2.25%
Liens URLs     http://www.webofsc ... OS:000628879000001
We report the effect of functional groups on pyrene adsorption and associated electropolymerization mechanisms on carbon nanotube model electrodes, as well as resulting electrochemical charge-storage properties in a Li metal supercapacitor configuration. The impact of pyrene functional groups is tested by varying the alkyl chain length as well as the composite electrode formulation protocol. From experiment and DFT calculations we conclude that (i) all pyrene derivatives bind strongly to the MWNT surface with submonolayer loadings. Intermolecular forces and/or packing configurations rather than charge transfer between MWCNT and substrate likely play a major role in the extent of self-adsorption process (ii) trends of predicted ionization energies (-HOMO levels) and Hammet substituent constants match with (measured) oxidation potentials of adsorbed monomers. However, this correlation fails for unsubstitued pyrene presumably because of molecular aggregation, an argument supported by excimer formation in supernatent solutions, (iii) fusion rather than linear-type oligomerization takes place and is described for the first time and, (iv) longer alkyl chains lead to more extended functionalized oligomers which in turn enhances p-doping (reversible capacity). In a Li metal hybrid supercapacitor configuration, best capacity-power compromise was found with 55 wt% pyrene-(CH2)COOH, resulting in a 5-fold capacity increase from 13 mAh/g(electrode) (19 F/g(electrode)) for untreated MWCNT to 68 mAh/g(electrode) (102 F/g(electrode)) between 2-4.4 V vs. Li+/Li.
Place: Weinheim Publisher: Wiley-V C H Verlag Gmbh WOS:000628879000001
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