Preparation, characterization and electrochemical behaviors of Bi sub(2)O sub(3) nanoparticles dispersed in silica matrix

Nanostructured bismuth oxide was prepared in silica media by a modified sol-gel method using of tetraethylorthosilicate and hydrated bismuth nitrate. The calcination temperature was determined by thermal gravimetric analysis. The morphology, crystal and electronic structure of composites were charac...

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Published inElectrochimica acta Vol. 148; pp. 93 - 103
Main Authors Farsi, Hossein, Moghiminia, Shokufeh, Roohi, Azam, Hosseini, Seyyed-Amirhossein
Format Journal Article
LanguageEnglish
Published 01.12.2014
Subjects
Bismuth oxides
Capacitance
Charge
Dispersion
Electrochemical analysis
Nanoparticles
Nanostructure
Silicon dioxide
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Summary:Nanostructured bismuth oxide was prepared in silica media by a modified sol-gel method using of tetraethylorthosilicate and hydrated bismuth nitrate. The calcination temperature was determined by thermal gravimetric analysis. The morphology, crystal and electronic structure of composites were characterized by powder X-ray diffraction, XRD, scaning electron microscopy, SEM, transmission electron microscopy,TEM, UV-vis diffuse reflectance spectroscopy and Mott-Schottky analysis. Cyclic voltammetry and galvanostatic charge and discharge curves were used to study the electrochemical and capacitive behaviors of dispersed Bi sub(2)O sub(3) nanoparticles in silica matrix in 1.0 M NaOH. Our studies showed that by decreasing in the amount of Bi sub(2)O sub(3) in nanocompsite, the normalized capacitance of bismuth oxide increases.
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ISSN:0013-4686
DOI:10.1016/j.electacta.2014.10.040