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http://dx.doi.org/10.9713/kcer.2016.54.2.157

Electrochemical Properties of Porous Co(OH)2 Nano-flake Thin Film Prepared by Electro-deposition for Supercapacitor  

Lee, Hyeon Jeong (Department of Chemical Engineering, Chungbuk National University)
Jin, En Mei (Department of Chemical Engineering, Chungbuk National University)
Jeong, Sang Mun (Department of Chemical Engineering, Chungbuk National University)
Publication Information
Korean Chemical Engineering Research / v.54, no.2, 2016 , pp. 157-162 More about this Journal
Abstract
Porous $Co(OH)_2$ nano-flake thin films were prepared by a potential-controlled electro-deposition technique at various deposition voltage (-0.75, -1.0, -1.2, and -1.4 V) on Ti-mesh substrates for supercapacitor application. The potential of electrode was controlled to regulate the film thickness and the amount of $Co(OH)_2$ nano-flake on the titanium substrate. The film thickness was shown to reach the maximum value of $34{\mu}m$ at -1.4 V of electrode potential, where 17.2 g of $Co(OH)_2$ was deposited on the substrate. The specific discharge capacitances were measured to be 226, 370, 720, and $1008mF\;cm^{-2}$ in the 1st cycle corresponding to the films which were formed at -0.75, -1.0, -1.2, and -1.4 V of electrode potentials, respectively. Then the discharge capacities were decreased to be 206, 349, 586 and $866mF/cm^{-2}$, where the persistency rates were 91, 94, 81, and 86%, respectively.
Keywords
Supercapacitor; Deposition; $Co(OH)_2$; Pseudocapacitor; Specific capacitance;
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Times Cited By KSCI : 5  (Citation Analysis)
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