摘要
以氧化石墨(GO)和NiSO_4·6H_2O为前驱体,氨水为沉淀剂,用化学沉淀-回流法制备Ni(OH)_2/还原氧化石墨烯(RGO)复合材料,用XRD、SEM表征材料的结构和表面微观形貌,用循环伏安(CV)、恒电流充放电和电化学阻抗(EIS)测试电极材料的电化学性能,研究了GO:Ni(OH)_2质量比和氨水浓度对复合材料结构、形貌和电化学性能的影响。结果表明:所制备的β-Ni(OH)_2/RGO复合材料为Ni(OH)_2纳米片与RGO片相互插层的结构,当氨水的浓度为3 mol/L,GO:Ni(OH)_2=1:8(质量比)时复合电极材料在0.2C的放电比容量高达334.9 mAh/g,5C的放电比容量为260.2 mAh/g,保持在β-Ni(OH)_2理论比容量的90%,表现出良好的倍率性能和循环性能。
Composite of nickel hydroxide/reduced graphene oxide(Ni(OH)_2/RGO) was synthesized by facile chemical precipitation-reflux method with graphite oxide and nickel sulfate hexahydrate as precursors and ammonium hydroxide as the precipitator. The surface morphology and microscopic structures of the composite were characterized by X-ray diffraction(XRD) and scan electron microscopy(SEM). The electrochemical performance of the composite was assessed by cyclic voltammetry(CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy(EIS). The influence of different mass ratio of graphite oxide to nickel hydroxide(GO: Ni(OH)_2) and the concentration of ammonium hydroxide on structures, morphologies, and electrochemical properties of the composite was investigated.The results show that the synthesized composite of β-Ni(OH)_2/RGO has mutually inserted structure. The composite of β-Ni(OH)_2/RGO exhibits high electrochemical performance of 334.9 mAh/g at 0.2C rate and260.2 m Ah/g at 5C rate when the concentration of ammonium hydroxide is 3 mol/L and the mass ratio of GO:Ni(OH)_2is 1:8, while the product can still maintain 90% of the theoretical specific capacity of β-Ni(OH)_2.It displays that this electrode material has excellent electrochemical performance with excellent rate capability.
作者
于慧颖
赫文秀
张永强
安胜利
刘君红
YU Huiying HE Wenxiu ZHANG Yongqiang AN Shengli LIU Junhong(School of Chemistry and Chemistry Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China Baotou Professional Technology College, Baotou 014010, China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2017年第3期226-232,共7页
Chinese Journal of Materials Research
基金
内蒙古自然科学基金(2014MS0523
2015MS0208)
内蒙古自治区高等学校青年科技英才计划-青年科技领军人才A类项目(NJYT-14-A08)
包头市科技计划(2015C2004-1)资助项目~~