Preparation of stable porous nickel and cobalt oxides using simple inorganic precursor, instead of alkoxides, by a sonochemical technique

• Published in: Ultrasonics sonochemistry 2005-02, Vol.12 (3), p.205-212
• Main Authors: Srivastava, D.N., Pol, V.G., Palchik, O., Zhang, L., Yu, J.C., Gedanken, A.
• Format: Article
• Language: English
• Subjects: Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Porous materials; Ultrasonic chemistry
• ISSN: 1350-4177; 1873-2828
• DOI: 10.1016/j.ultsonch.2004.01.003

Porous nickel and cobalt oxides were prepared using NiSO 4 · 6H 2O and anhydrous Co(CH 3COO) 2, a precursor other than alkoxides and cetyltrimethylammonium bromide as organic surfactant. The sonication method has been used for such synthesis. The surfactants were removed by calcination, as well as by solvent extraction and it is extent was examined by IR spectroscopy. The trend of removal of surfactant was followed by TGA studies and the change in phases by DSC. The products were identified by XRD. Peak in low angle XRD indicates the porous nature of the oxides. The morphology of the pores was studied by transmission electron microscopy. The pores were found less ordered, having an average size of 4–6 nm. The Brunauer–Emmet–Teller surface areas of the as-prepared, as well as the treated samples are reported having H2 and H4 type hysteresis for Ni and Co, respectively.