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Journal of Solid State Electrochemistry

, Volume 21, Issue 9, pp 2567–2576 | Cite as

Simple chemical route for nanorod-like cobalt oxide films for electrochemical energy storage applications

  • Assumpta C Nwanya
  • Daniel Obi
  • Rose U. Osuji
  • R. Bucher
  • Malik Maaza
  • Fabian I. Ezema
Original Paper

Abstract

We used a simple chemical synthesis route to deposit nanorod-like cobalt oxide thin films on different substrates such as stainless steel (ss), indium tin oxide (ITO), and microscopic glass slides. The morphology of the films show that the films were uniformly spread having a nanorod-like structure with the length of the nanorods shortened on ss substrates. The electrochemical properties of the films deposited at different time intervals were studied using cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). The film deposited after 20 cycles on ss gave the highest specific capacity of 67.6 mAh g−1 and volumetric capacity of 123 mAh cm−3 at a scan rate 5 mV s−1 in comparison to 62.0 mAh g−1 and 113 mAh cm−3 obtained, respectively, for its counterpart on ITO. The film electrode deposited after 20 cycles on ITO gave the best rate capability and excellent cyclability with no depreciation after 2000 charge–discharge cycles.

Keywords

Cobalt oxide Specific capacitance Nanorod-like SILAR Stainless steel 

Notes

Acknowledgements

The UNN group thanks the US Army Research Laboratory for the financial support given to this research (under Contract number W911NF-12-1-0588). The UNN Research Group is also grateful for the financial support given by Engr Emeka Okwuosa the MD Oilserv Group Of Companies Ltd. and for sponsoring her Nano conferences of 2014 and 2016.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Department of Physics and AstronomyUniversity of Nigeria NsukkaNsukkaNigeria
  2. 2.INRS Centre for Energy, Materials and Telecommunications and UNESCO Chair in Materials and Technologies for Energy Conversion, Saving and StorageQCCanada
  3. 3.Nanosciences African Network (NANOAFNET), iThemba LABS-National ResearchCape TownSouth Africa
  4. 4.UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate StudiesUniversity of South Africa (UNISA)PretoriaSouth Africa

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