Synthesis and electrochemical characterization of mesoporous CoxNi1-x layered double hydroxides as electrode materials for supercapacitors

被引:219
作者
Hu, Zhong-Ai [1 ]
Xie, Yu-Long [1 ]
Wang, Yao-Man [1 ]
Wu, Hong-Ying [1 ]
Yang, Yu-Ying [1 ]
Zhang, Zi-Yu [1 ]
机构
[1] NW Normal Univ, Key Lab Polymer, Coll Chem & Chem Engn, Lanzhou 730070, Peoples R China
关键词
Synthesis; CoxNi1-x layered double hydroxides; Electrochemical characterization; Supercapacitors; CAPACITIVE PERFORMANCE; HYDROUS RUTHENIUM; ALPHA-COBALT; Y-ZEOLITE; OXIDE; CARBON; CO; DEPOSITION; COMPOSITE; BEHAVIOR;
D O I
10.1016/j.electacta.2008.11.035
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A novel nanostructured mesoporous CoxNi1-x layered double hydroxides (CoxNi1-x LDHs), which both Co(CH)(2) and Ni(CH)(2) exhibit, has been successfully synthesized by a chemical co-precipitation route using polyethylene glycol as the structure-directing reagent. Structural and morphological characterizations were performed using powder X-ray diffraction (XRD) and held emission scanning electron microscopy (FESEM). The component and thermal stability of the sample were measured by energy dispersed X-ray spectrometry (EDS), Fr-IR and thermal analyses, including thermogravimetry (TG) and differential thermal analysis (DTA). Cyclic voltarnmogram and galvanostatic charge-discharge testified that the CoxNi1-x LDH has a specific capacitance of 1809 F g(-1) at a current density of 1 Ag-1 and remains at about 90.2% of the initial value after 1000 cycles at a current density of 10 A g(-1). The relationship between the chemical composition and the capacitance is discussed. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2737 / 2741
页数:5
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