Originall conductive nano-Co₃O₄ investigated as electrode material for hybrid supercapacitors

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

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Cobalt oxides have been extensively used as conductive additives for Ni-MH batteries. We report in this paper the performances of an original nanometric cobalt oxide, close to Co₃O₄, as electrode material for hybrid supercapacitors. This spinel type phase contains hydrogen, lithium, cobalt vacancies, and especially Co⁴⁺ ions within the structure, leading to a high electronic conductivity. Cyclic voltammetry and impedance spectroscopy measurements show interesting capacitance (320 F/g in 8M-KOH), as well as good electrochemical cycling with a small amount of carbon black (5%).

Mots clés: Cobalt compounds; Electrical conductivity; Electrochemical electrodes; Electrochemical impedance spectroscopy; Nanofabrication; Nanoparticles; Vacancies; Crystal; Voltammetry

Domaines: Matériaux

Gérôme Godillot, Liliane Guerlou-Demourgues, Pierre-Louis. Taberna, Patrice Simon, Claude Delmas. Originall conductive nano-Co₃O₄ investigated as electrode material for hybrid supercapacitors. Electrochemical and Solid-State Letters, 2011, 14 (10), pp.A139-A142. ⟨10.1149/1.3609259⟩. ⟨hal-00611716⟩