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Preparation of Nano-Co3O4 by Direct Thermal Decomposition of Cobalt(II) Nitrate Hexahydrate for Electrochemical Water Oxidation

[ Vol. 14 , Issue. 2 ]

Author(s):

Mohammed Ameen Ahmed Qasem , Md. Abdul Aziz *, Abbas Saeed Hakeem and Sagheer A. Onaizi   Pages 154 - 159 ( 6 )

Abstract:


Background: Nano-Co3O4 has been used in various technological areas and applications such as electrochemical sensors and electrochemical water splitting. Even though many efforts have been expended to prepare nano-Co3O4, the development of novel methods to prepare Co3O4 using simple processes and at low cost remain a topic of interest. Besides, it could be economic and useful if the synthesized nanoparticle could be applied as efficient electrocatalyst upon its immobilization on a cheap base electrode material by very simple method for various practical applications including renewable energy.

Method: We prepared nano-Co3O4 by a direct thermal decomposition of an inexpensive, simple and widely available cobalt inorganic precursor, such as Co(NO3)2·6H2O without any type of prereaction or processing. The nano-Co3O4 was immobilized on filter-paper-derived carbon electrode by drop-drying method for applying as electrode materials toward water electrooxidation.

Results: The X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy analysis confirmed the formation of short nanorods of single-phase Co3O4 upon thermal decomposition of Co(NO3)2·6H2O at 520°C. The electrocatalytic properties of the nano- Co3O4 were evaluated after immobilizing it on a cheap carbon electrode derived from normal filter paper. The modified electrode showed good electrocatalytic properties toward water oxidation in an alkaline solution.

Conclusion: In conclusion, we developed a very simple, straight-forward and economic method for preparation of nano-Co3O4 and immobilized it on very cheap carbon electrode for evaluating its electrocatalytic properties. Due to the high electrocatalytic properties, the prepared nano-Co3O4 could potentially play an important role in various practical fields.

Keywords:

Cobalt(II) nitrate hexahydrate, thermal decomposition, nano-Co3O4, characterization, filter-paper-derived carbon electrode, electrochemical water oxidation.

Affiliation:

Center of Excellence in Nanotechnology (CENT), King Fahd University of Petroleum and Minerals, KFUPM Box 5040, Dhahran 31261, Center of Excellence in Nanotechnology (CENT), King Fahd University of Petroleum and Minerals, KFUPM Box 5040, Dhahran 31261, Center of Excellence in Nanotechnology (CENT), King Fahd University of Petroleum and Minerals, KFUPM Box 5040, Dhahran 31261, Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, KFUPM Box 5040, Dhahran 31261

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