Simple chemical route for nanorod-like cobalt oxide films for electrochemical energy storage applications |
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| Authors: | Assumpta C Nwanya Daniel Obi Rose U. Osuji R. Bucher Malik Maaza Fabian I. Ezema |
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| Affiliation: | 1.Department of Physics and Astronomy,University of Nigeria Nsukka,Nsukka,Nigeria;2.INRS Centre for Energy, Materials and Telecommunications and UNESCO Chair in Materials and Technologies for Energy Conversion, Saving and Storage,QC,Canada;3.Nanosciences African Network (NANOAFNET), iThemba LABS-National Research,Cape Town,South Africa;4.UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies,University of South Africa (UNISA),Pretoria,South Africa |
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| 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. |
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