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为研究还原剂对Ni(OH)_2/还原氧化石墨烯(RGO)复合材料结构及电化学性能的影响,首先以氧化石墨烯(GO)和硝酸镍作前驱体,采用水热法制备了Ni(OH)_2/RGO复合材料;然后,利用XRD、SEM和Raman光谱仪表征了复合材料的结构和形貌,并采用循环伏安法、恒流充放电曲线和电化学阻抗谱研究了复合材料的电化学性能。结果表明:以(NH2)2CSO2作还原剂时,制备的β-Ni(OH)_2/RGO复合材料为RGO纳米片与Ni(OH)_2纳米片相互插层的结构;在电解液(6mol/L KOH溶液)中,0.2C放电倍率时β-Ni(OH)_2/RGO复合材料的比容量高达341.0mAh/g,10.0C放电倍率为时复合材料的比容量为242.2mAh/g,仍能保持β-Ni(OH)_2理论比容量的83.8%。所得结论表明制备的Ni(OH)_2/RGO复合材料显现出良好的电化学性能。
In order to study the effect of reductant on the structure and electrochemical performance of Ni (OH) 2 / RGO composite, GO and nickel nitrate were used as precursors to prepare Ni (OH) 2 / RGO composites. The structure and morphology of the composites were characterized by XRD, SEM and Raman spectroscopy. The cyclic voltammetry, constant current charge / discharge curves and electrochemical impedance spectroscopy Electrochemical performance. The results showed that the composite of RGO nanosheets and Ni (OH) 2 nanosheets intercalated with (NH 2) 2 CSO 2 as reductant and the β-Ni (OH) L KOH solution), the specific capacity of β-Ni (OH) _2 / RGO composite reached as high as 341.0mAh / g at 0.2C discharge rate, and the specific capacity of composite was 242.2mAh / g at the discharge rate of 10.0C Maintained 83.8% of the theoretical capacity of β-Ni (OH) _2. The results show that the prepared Ni (OH) _2 / RGO composites show good electrochemical performance.