Synthesis and electrochemical characterization of mesoporous CoxNi1−x layered double hydroxides as electrode materials for supercapacitors |
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Authors: | Zhong-Ai Hu Yu-Long Xie Yao-Xian Wang Hong-Ying Wu Yu-Ying Yang Zi-Yu Zhang |
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Affiliation: | Key Laboratory of Polymer, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, PR China |
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Abstract: | A novel nanostructured mesoporous CoxNi1−x layered double hydroxides (CoxNi1−x LDHs), which both Co(OH)2 and Ni(OH)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 field emission scanning electron microscopy (FESEM). The component and thermal stability of the sample were measured by energy dispersed X-ray spectrometry (EDS), FT-IR and thermal analyses, including thermogravimetry (TG) and differential thermal analysis (DTA). Cyclic voltammogram 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 A g−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. |
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Keywords: | Synthesis CoxNi1&minus x layered double hydroxides Electrochemical characterization Supercapacitors |
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