Electrochemical study of conductive nanometric Co3O4-based electrodes for asymmetric supercapacitors in alkaline electrolyte

Gérôme Godillot (1) , Pierre-Louis Taberna (2, 3) , Barbara Daffos (3, 2) , Patrice Simon (2, 3) , Claude Delmas (1) , Liliane Guerlou-Demourgues (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 RS2E - Réseau sur le stockage électrochimique de l'énergie

Lithiated and protonated spinel cobalt oxide, exhibiting high electrical conductivity thanks to the presence of structural defects, could be envisioned for asymmetric supercapacitor applications. Charge storage mechanism was investigated and it is shown that only a thin layer at the material surface was involved (less than 1 nm) during the process, so that only 20% of the total theoretical capacity was achieved. A very good electrochemical stability is found, with less than 30% of the initial capacity (∼70 mA·h·g−1) lost after 3500 cycles.

Mots clés: spinel; supercapacitor; electrode; cobalt oxide

Domaines: Autre; Matériaux

Gérôme Godillot, Pierre-Louis Taberna, Barbara Daffos, Patrice Simon, Claude Delmas, et al.. Electrochemical study of conductive nanometric Co3O4-based electrodes for asymmetric supercapacitors in alkaline electrolyte. Journal of The Electrochemical Society, 2016, 163 (9), pp.A2004-A2010. ⟨10.1149/2.0951609jes⟩. ⟨hal-01358733⟩