Ni(OH)_2/N-rGO气凝胶材料的制备与电化学性能

The preparation and electrochemical properties of Ni(OH)_2/N-rGO aerogel materials

采用一步水热法在不同反应时间下制得了系列氢氧化镍与氮还原氧化石墨烯复合材料(简称NG)。用XRD、FT-IR、Raman、XPS、SEM和N2-BET方法表征材料的结构和物化性能。结果表明,所制备材料中Ni(OH)_2晶粒随着反应时间的增加而变大,且复合材料具有介孔特征。三电极体系下循环伏安、充放电和寿命测试结果表明,反应2h的NG-2样品具有最大电容量(1 280F/g)。且复合材料的电容量随反应时间呈先增大后减小的趋势,这与复合材料的孔特性、Ni(OH)_2晶粒大小和N原子掺杂有关。

One-step hydrothermal method was used to fabricate a series of nickel hydroxide and nitrogen reduced graphene oxide composites (NGs) under different reaction time. The structure and physicochemical properties of the materials were characterized by XRD, FT-IR, Raman, XPS, SEM and N2-BET methods. The results show that the Ni(OH)2 crystallites in the as-prepared material increased with the increase of reaction time, and the composites had mesoporous characteristics. The results of cyclic volt-ampere, charge-discharge and life test under three-electrode system show that the maximum capacitance of the series materials was 1280 F/g (NG-2) when the reaction time was 2 h. The capacitance increased first and then decreased with the increasing reaction time, indicating that the capacitance of the materials would be related to the pore characteristics of the composite, Ni(OH) 2 grain size and the doping N atoms.