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Electrochemical Performances of Ni/Al⁃LDHs/rGO Composites Prepared by Homogeneous Precipitation Method
Huang Renshu, Yao Jinhuan, Liang Xiaoli, Jin Xiuying, Li Yanwei
Ni/Al⁃LDHs/rGO composites with various GO contents (0, 0.2%, 0.5%, 0.8% and 1.0%) were prepared by a facile homogeneous precipitation method with Ni(NO3)2·6H2O, Al(NO3)3·9H2O, urea, and GO as raw materials. The microstructure and surface morphology of the prepared samples were characterized by XRD, FT⁃IR, TGA, and FESEM; the electrochemical properties of the samples as anode materials for Ni⁃MH battery were studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge⁃discharge tests. The results demonstrated that the electrochemical performance of Ni/Al⁃LDHs can be significantly improved by incorporating rGO. Among the five samples, the Ni/Al⁃LDHs/rGO composite with GO content of 0.8% exhibited the most excellent comprehensive electrochemical performance.For example, at the high current density of 2 000 mA/g, it still delivered a specific discharge capacity of 288 mA·h/g, which is 40.5% higher than that (205 mA·h/g) of the pure Ni/Al⁃LDHs sample.
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