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Preparation of nickel - cobalt spinel oxides NixCo3-xO4. Comparison of two physical properties stemming from four different preparation methods and using carbon paste electrode

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Author(s): Makhtar Guene | Abdou Aziz Diagne | Modou Fall | Mor Marème Dieng | Gérard Poillerat

Journal: Bulletin of the Chemical Society of Ethiopia
ISSN 1011-3924

Volume: 21;
Issue: 2;
Start page: 255;
Date: 2007;
Original page

Keywords: Nickel cobalt spinel oxides | Porosity | Electrical conductivity | Mixed oxides electrodes | Carbon paste electrode | Pechini sol-gel method

ABSTRACT
A comparative study of two electro-physical properties (porosity and electrical conductivity) of binary nickel cobalt oxides electrodes with spinels mixed oxides NixCo3-xO4 as active matter, was carried out. Four different routes were used to prepare spinel-type NixCo3-xO4 (0 ≤ x ≤ 2.5) compounds in order to link these properties with the preparation method. The substitution of Ni for Co increases the conductivity and the porosity of the electrode till a certain ratio of nickel. X-ray diffraction patterns showed that the oxides crystallize in a cubic spinel phase. Electrical conductivity as well as porosity depends on the preparation route.

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