Simple chemical route for nanorod-like cobalt oxide films for electrochemical energy storage applications
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.
KeywordsCobalt oxide Specific capacitance Nanorod-like SILAR Stainless steel
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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