碳纳米纤维负载氧化镍复合材料的制备及其电化学电容性能

Synthesis of CNF@NiO composite and its electrochemical capacitive properties

为改善NiO的导电性及比表面积,进而提高其比电容,利用静电纺丝技术及水热合成法,制备了以碳纳米纤维(carbon nanofiber,CNF)为核、超薄的NiO纳米片为壳的CNF@NiO复合材料。实验研究了纺丝电压及尿素加入量对材料形貌的影响,并采用循环伏安、恒流充放电法对材料的电化学性能进行测试。结果表明:当纺丝电压为12kV及Ni(NO_3)_2·6H_2O/尿素的比例为1/3时,可以得到形貌良好的CNF@NiO复合材料;当电流密度为0.5A/g时,CNF@NiO复合材料的比电容为305F/g。对比其他NiO基材料,说明通过构建以电导率优良的CNF为核、NiO纳米片为壳的复合材料能有效提高NiO的比电容。

To enhance the capacitance of NiO via improving its conductivity and specific surface area, CNF@NiO composites with carbon nanofibers （carbon, nanofiber, CNF） as core and ultra thin NiO nanosheets as shell were prepared through electrospinning combined with hydrothermal method. The influence of electrospinning voltage and the adding amount of urea on morphology was investigated. Cyclic voltammetry and galvanostatic charge-discharge measurements were employed to evaluate the electrochemical performance of CNF@NiO. The results show that CNF@NiO composites with good morphology can be obtained when electro-spinning voltage and ratio of Ni（NO3）2 ？ 6H2 O/urea is 12 kV and 1/3, respectively. When the current specific capacitance of CNF@NiO composite is 305 F/g. Compared with other NiO-based materialcore-shell architecture composed of CNF andNiO can effectively improve the electrochemical performance of NiO.