Title :

Electrochemical properties and capacitance of Hausmannite Mn 3 O 4 – carbon composite synthesized by in situ autocombustion method.

Author(s) :

Kéranguéven, Gwénaëlle [Auteur]
Faye, Jérémy [Auteur]
Royer, sebastien [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Pronkin, Sergey N. [Auteur]

Journal title :

Electrochimica Acta

Volume number :

222

Pages :

755-764

Publication date :

2016-12-20

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

Manganese oxide – carbon composites consisting in Hausmannite Mn3O4 nanoparticles and Vulcan carbon were prepared by in situ autocombustion method (ISAC). The electrochemical properties of the composites and their ...
Show more >Manganese oxide – carbon composites consisting in Hausmannite Mn3O4 nanoparticles and Vulcan carbon were prepared by in situ autocombustion method (ISAC). The electrochemical properties of the composites and their pseudo-capacitance have been evaluated at different pH. The composites with optimized carbon content demonstrated at pH = 14 high specific oxide capacitance (754 F/g of oxide at 1 mV/s) with just a moderate decrease at higher sweep rate (439 F/g at 500 mV/s). Relatively fast and reversible redox transformations of Mn3O4 into substoichiometric possibly hydrated oxides were tentatively proposed as the main processes responsible for observed pseudo-capacitance. High oxide capacitance suggested that the bulk of oxide particles is participating in charge storage. Systematic decrease of the reversibility and contribution of these redox processes into pseudo-capacitance was detected when pH decreases from 14 to 10. A continuous decrease in capacitance during 10000 galvanostatic cycles was observed at high pH (13 and 14); however, capacitance stabilized at lower pH after a drop during first few thousand cycles.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Matériaux pour la catalyse (MATCAT)

Submission date :

2019-09-25T14:38:11Z