Synergy of Mn and Co in slab-based nanocomposites for hybrid supercapacitors: impact of restacking process on electrochemical properties

Celine Tang (1, 2) , Domitille Giaume (3, 4) , François Weill (1) , Nicolas Penin (1) , Marie Anne Dourges (5) , Hassan Saadaoui (6) , Liliane Guerlou-Demourgues (1, 2)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 RS2E - Réseau sur le stockage électrochimique de l'énergie
3 IRCP - Institut de Recherche de Chimie Paris
4 PSL - Université Paris Sciences et Lettres
5 ISM - Institut des Sciences Moléculaires
6 CRPP - Centre de Recherche Paul Pascal

To develop materials with enhanced electrochemical properties, an original synthesis strategy based on the exfoliation and restacking of manganese and cobalt layered transition metal oxides has been explored. Successful exfoliation yielded “building nanoblocks”, which were further reassembled in mixed nanocomposites, by modifications of electrostatic interactions in solution. Three methods were tested, differing by the acidification procedure and time of mixing. The restacking conditions play a key role on the microstructural homogeneity of the nanocomposites. Such a nanocomposite approach marrying a good electronic conductor (cobalt oxyhydroxide) with a pseudocapacitive material (manganese oxide) should thus be very beneficial for development of highly efficient pseudocapacitors.

Mots clés: Exfoliation; Layer restacking; Layered transition metal oxides; Electrode material; Supercapacitors; Energy storage

Domaines: Matériaux

Celine Tang, Domitille Giaume, François Weill, Nicolas Penin, Marie Anne Dourges, et al.. Synergy of Mn and Co in slab-based nanocomposites for hybrid supercapacitors: impact of restacking process on electrochemical properties. ACS Applied Energy Materials, 2019, 2 (11), pp.7832-7842. ⟨10.1021/acsaem.9b01263⟩. ⟨hal-02382879⟩