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Received June 15, 2016
Accepted November 20, 2016
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Electrochemical properties of α-Co(OH)2/graphene nano-flake thin film for use as a hybrid supercapacitor
Department of Chemical Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk 28644, Korea 1School of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk 28644, Korea
smjeong@chungbuk.ac.kr
Korean Journal of Chemical Engineering, March 2017, 34(3), 885-891(7), 10.1007/s11814-016-0323-z
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Abstract
Porous nano-flake-like α-Co(OH)2 thin films were prepared by electro-deposition on graphene nanosheets (GNS) and functionalized f-GNS at 1.0 V. The functionality of hydrophilic functional groups was increased by acid treatment to enhance electrode wettability and improve the compatibility between the electrode and the electrolyte. Hydrophilic functional groups can act as anchoring sites for the precursors, enabling Co(OH)2 to more grow easily on an f-GNS electrode. The density and thickness of the α-Co(OH)2 deposition on the f-GNS electrode (13.1 μm) was greater than that on the GNS (12.3 μm) electrode. The specific discharge capacitance of the α-Co(OH)2/f-GNS electrode decreased from an initial value of 2,149mFcm-2 to 1,944 mFcm-2 over 1000 cycles, demonstrating the retention of 90% of its discharge capacitance. A hybrid capacitor was also assembled to evaluate the characteristics of a two-electrode system using α-Co(OH)2/f-GNS as the cathode. The power and energy densities of the Co(OH)2/f-GNS supercapacitor are 1,137Wkg-1 and 43Whkg-1 at 8mAcm-2, respectively.
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