Characterization of cobalt oxides studied by FT-IR, Raman, TPR and TG-MS
Resource
Thermochimica Acta 473 (1-2): 68-73
Journal
Thermochimica Acta
Pages
68-73
Date Issued
2008
Date
2008
Author(s)
Tang, Chih-Wei
Wang, Chen-Bin
Chien, Shu-Hua
Abstract
The as-prepared cobalt oxide (assigned as CoOx) was fabricated by precipitation-oxidation from aqueous cobalt nitrate solution using sodium hydroxide and oxidation with hydrogen peroxide. Another series of pure cobalt oxides was refined by the decomposition of CoOx in a nitrogen environment at temperatures of 280, 450 and 950 °C (D-280, D-450 and D-950, respectively). Phase transformation, structural properties and red-ox properties were characterized by thermogravimetry-mass spectrometry (TG-MS), X-ray diffraction (XRD), infrared spectroscopy (IR), Raman spectroscopy and temperature-programmed decomposition/reduction (TPD/TPR). Analysis of the thermal behavior on CoOx revealed that a series of pure cobalt oxide with particle sizes of 10-20 nm could be obtained easily. The results demonstrated that the refined samples D-280, D-450 and D-950 were CoO(OH), Co3O4 and CoO, respectively. © 2008 Elsevier B.V. All rights reserved.
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