SYNTHESIS AND CHARACTERIZATION OF Ni0.4Co2.6O4 SPINEL MIXED OXIDES POWDER: STUDY OF ITS SURFACE PROPERTIES BY VOLTAMMETRY, X-RAY, FTIR, UV-VIS-NIR SPECTROSCOPY AND SCANNING ELECTRON MICROSCOPY

Abstract

Electrochemical studies were carried out on Ni_0.4Co_2.6O₄ powders prepared by sol-gel via propionic acid method using cyclic and steady state voltammetries. The oxide surface was characterized by scanning electron microscopy (SEM), X-ray diffraction, UV-vis-NIR and FTIR spectroscopies. The results showed that the formation of homogeneous oxide with a single spinel phase occurred at 350°C. The surface redox couple NiOOH/Ni(OH)₂ is confined on the surface material l.



KEY WORDS: Ni_0.4Co_2.6O₄ spinel mixed oxides powder, Sol-gel process, Surface properties


Bull. Chem. Soc. Ethiop. 2005, 19(2), 213-220.