Supercapacitor behaviour of cobalt-doped nickel oxide films |
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| Authors: | KK Purushothaman S Vijayakumar S Nagamuthu |
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| Institution: | 1. Department of Physics , TRP Engineering College , Irungalur 621105 , Tamilnadu , India;2. Department of Physics , Gandhigram Rural Institute – Deemed University , Gandhigram 624302 , Tamilnadu , India |
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| Abstract: | Ordered nanostructured cobalt-doped nickel oxide films were prepared on a conducting glass substrate via the sol–gel dip-coating method. X-ray diffraction analysis shows the films to be amorphous. Field-emission scanning electron microscope images showed well-defined, ordered grains with pores in between them. Supercapacitor behaviour was studied using cyclic voltammetry. A maximum specific capacitance of 1982?F/g at a scan rate of 5?mV/s with 1?M KOH was obtained for 5?wt% of cobalt-doped nickel oxide films. AC impedance analysis showed that the solution resistance was R s?=?27?Ω and the charge transfer resistance R ct?=?20?Ω. |
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| Keywords: | nanoporous materials sol–gel processes supercapacitor XRD FESEM |
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