Effects of complex agents on the anodic deposition and electrochemical characteristics of cobalt oxides

被引:39
作者
Hu, Chi-Chang [1 ]
Hsu, Tung-Yu [2 ]
机构
[1] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 30013, Taiwan
[2] Natl Chung Cheng Univ, Dept Chem Engn, Chiayi 621, Taiwan
关键词
cobalt oxide; anodic deposition; complex agents; pseudocapacitance; supercapacitors;
D O I
10.1016/j.electacta.2007.09.060
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The anodic deposition rate of cobalt oxide from CoCl2 center dot 6H(2)O is strongly affected by the type of complex agents (acetate ion (AcO-), citrate ion, EDTA) added into the deposition solutions. The oxidation potential of CoCl2 center dot 6H(2)O, examined by linear sweep voltammetry (LSV), is negatively shifted from ca. 1.1 V to about 0.8, 0.5, and 0.2 V by adding AcO-, citrate ion, and EDTA, respectively. The deposition rate of cobalt oxide is found to depend not only on the coordinating strength between Co and ligands but also on the conversion rate of the Co-L complexes & ligand) into the oxy-hydroxyl-Co species after electron transfer. The textural and electrochemical characteristics of resultant Co oxides, examined by X-ray photoelectron spectroscopic (XPS), scanning electron microscopic (SEM), open-circuit potential versus time. and cyclic voltammetric analyses. are also influenced by varying the complex agents. The deposition rate is the highest when the Co oxide is deposited from the precursor solution containing AcO-, which also exhibits the highest specific capacitance of ca. 230 F g(-1) among all Co oxide deposits (as the oxide loading > 0.05 mg cm(-2)). demonstrating its most promising applicability in the electrochemical supercapacitors. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2386 / 2395
页数:10
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