TY - JOUR
T1 - Synthesis of Co 3O 4 nanosheets via electrodeposition followed by ozone treatment and their application to high-performance supercapacitors
AU - Kung, Chung Wei
AU - Chen, Hsin Wei
AU - Lin, Chia Yu
AU - Vittal, R.
AU - Ho, Kuo Chuan
N1 - Funding Information:
This work was sponsored by the National Research Council of Taiwan .
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/9/15
Y1 - 2012/9/15
N2 - A thin film of Co 3O 4 nanosheets is electrodeposited on a flexible Ti substrate by a one-step potentiostatic method, followed by an UV-ozone treatment for 30 min. The films before and after the UV-ozone treatment are characterized with X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The film is composed of Co(OH) 2 before UV-ozone treatment, and of Co 3O 4 after the treatment. The morphologies of both films are examined by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The obtained films are composed of nanosheets, and there is no change in their sheet-like morphology before and after the UV-ozone treatment. When applied for a supercapacitor, the Co 3O 4 modified Ti electrode (Co 3O 4/Ti) shows a far higher capacitance than that of the Co(OH) 2 modified Ti electrode. The electrodeposition time and NaOH concentration in the electrolyte are optimized. A remarkably high specific capacitance of 1033.3 F g -1 is obtained for the Co 3O 4 thin film at a charge-discharge current density of 2.5 A g -1. The long-term stability data shows that there is still 77% of specific capacitance remaining after 3000 repeated charge-discharge cycles. The high specific capacitance and long-term stability suggest the potential use of Co 3O 4/Ti for making a flexible supercapacitor.
AB - A thin film of Co 3O 4 nanosheets is electrodeposited on a flexible Ti substrate by a one-step potentiostatic method, followed by an UV-ozone treatment for 30 min. The films before and after the UV-ozone treatment are characterized with X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The film is composed of Co(OH) 2 before UV-ozone treatment, and of Co 3O 4 after the treatment. The morphologies of both films are examined by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The obtained films are composed of nanosheets, and there is no change in their sheet-like morphology before and after the UV-ozone treatment. When applied for a supercapacitor, the Co 3O 4 modified Ti electrode (Co 3O 4/Ti) shows a far higher capacitance than that of the Co(OH) 2 modified Ti electrode. The electrodeposition time and NaOH concentration in the electrolyte are optimized. A remarkably high specific capacitance of 1033.3 F g -1 is obtained for the Co 3O 4 thin film at a charge-discharge current density of 2.5 A g -1. The long-term stability data shows that there is still 77% of specific capacitance remaining after 3000 repeated charge-discharge cycles. The high specific capacitance and long-term stability suggest the potential use of Co 3O 4/Ti for making a flexible supercapacitor.
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U2 - 10.1016/j.jpowsour.2012.04.076
DO - 10.1016/j.jpowsour.2012.04.076
M3 - Article
AN - SCOPUS:84861369597
VL - 214
SP - 91
EP - 99
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -