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Journal of Applied Electrochemistry

, Volume 49, Issue 3, pp 251–259 | Cite as

Effect of Co(NO3)2·6H2O thermal decomposition temperature on the nano-Co3O4 product morphology and electrocatalysis of water oxidation

  • Mohammed Ameen Ahmed Qasem
  • Abuzar Khan
  • Sagheer A. OnaiziEmail author
  • Hatim Dafalla Mohamed
  • Aasif Helal
  • Md. Abdul AzizEmail author
Research Article
  • 169 Downloads

Abstract

Herein, we report the electrochemical water oxidation efficiency of nano-Co3O4 catalyst samples obtained by the thermal decomposition of Co(NO3)2·6H2O at various temperatures (320, 420, 520, and 620 °C). The structural and morphological details of the synthesized samples were determined by employing X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. These studies revealed the formation of well-dispersed nano-Co3O4 particles with sizes, shapes, and crystallinity levels that differed for the different decomposition temperatures. The prepared catalysts were immobilized on filter-paper-derived carbon electrodes for checking their electrochemical properties. The electrochemical efficiency levels of the Co3O4 catalyst samples were evaluated by employing each of them as an anode to study the water oxidation reaction. The nano-Co3O4 sample prepared at 420 °C yielded the highest efficiency and good stability towards the water oxidation reaction. The higher efficiency of this sample was attributed to the relatively small average size and low level of agglomeration of its nanoparticles, and to the high electrochemically active surface area of its electrode.

Graphical abstract

Different morphology and crystallinity of nano-Co3O4 were prepared by simple and straightforward thermal decomposition of Co(NO3)2·6H2O for electrochemical water oxidation. The nano-Co3O4 prepared at 420 °C showed the highest efficiency and good stability towards water oxidation.

Keywords

Co(NO3)2·6H2Thermal decomposition temperature Nano-cobalt oxide Filter-paper-derived carbon electrode Oxygen evolution 

Notes

Acknowledgements

The authors acknowledge the support from the Center of Research Excellence in Nanotechnology (CENT) at the Research Institute of King Fahd University of Petroleum and Minerals in the Kingdom of Saudi Arabia.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Mohammed Ameen Ahmed Qasem
    • 1
    • 2
  • Abuzar Khan
    • 1
  • Sagheer A. Onaizi
    • 2
    Email author
  • Hatim Dafalla Mohamed
    • 3
  • Aasif Helal
    • 1
  • Md. Abdul Aziz
    • 1
    Email author
  1. 1.Center of Research Excellence in Nanotechnology (CENT)King Fahd University of Petroleum and Minerals, KFUPMDhahranSaudi Arabia
  2. 2.Department of Chemical EngineeringKing Fahd University of Petroleum and Minerals, KFUPMDhahranSaudi Arabia
  3. 3.Center for Engineering Research (CER)King Fahd University of Petroleum and Minerals, KFUPMDhahranSaudi Arabia

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