PREPARATION OF NICKEL - COBALT SPINEL OXIDES NixCO3-xO4.COMPARISON OF TWO PHYSICAL PROPERTIES STEMMING FROM FOUR DIFFERENT PREPARATION METHODS AND USING CARBON PASTE ELECTRODE

  • Makhtar Guene
  • Abdou Aziz Diagne
  • Modou Fall
  • Mor Marème Dieng Laboratoire de Chimie Physique Organique et d’Analyse Instrumentale, Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
  • Gérard Poillerat Laboratoire d’Electrochimie et Chimie Physique du Corps Solide, Faculté de Chimie, Université Louis Pasteur, rue Blaise Pascal 67000, Strasbourg, France
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.
KEY WORDS: Nickel cobalt spinel oxides, Porosity, Electrical conductivity, Mixed oxides electrodes, Carbon paste electrode, Pechini sol-gel method

Bull. Chem. Soc. Ethiop. 2007, 21(2), 255-262.
Published
2007-07-10
Section
Articles

Journal Identifiers


eISSN: 1726-801X
print ISSN: 1011-3924