基于沉淀转化法制备的纳米NiO混合电容器研究

运用沉淀转化法制备Ni(OH)2超微粉末,并通过热处理得到纳米NiO.利用TG、XRD、TEM、N2吸附,循环伏安和恒流充放电测试对样品进行了分析和表征.结果表明,实验制备的NiO粒径为10nm左右,比表面积达到186.3m2/g,并具有合适的孔径分布,NiO赝电容器的工作电压为0.35V,在电流密度为60mA/g时,其比容达到243F/g.以NiO和中孔活性炭分别作为正极和负极材料组装成NiO-AC混合电容器,混合电容器的工作电压达到1.5V,其能量密度为NiO赝电容器的17.2倍,并具有更好的功率特性.

Studies on hybrid capacitor based on nanosized NiO prepared by precipitation transformation method

Ni(OH)_2 ultrafine powders were synthesized by precipitation transformation method.Nanosized NiO was prepared by calcining the as prepared Ni(OH)_2 ultrafine powders.The samples were analyzed by thermal gravity(TG),X-ray diffraction(XRD),transmission electron microscopy(TEM),N_2 adsorption,cyclic voltammetry and galvanostatic charge/discharge.The results show that particle size of the NiO is about 10nm,the BET specific surface area is 186.3m~2/g with an appropriate pore size distribution.The working voltage of the NiO pseudocapacitor is 0.35V.At a current density of 60mA/g,the NiO has a specific capacitance of 243F/g.By using NiO and mesoporous AC as the positive and negative electrode materials,respectively,an hybrid capacitor was fabricated.The working voltage of the hybrid capacitor is 1.5V and it has a much better power performance and an energy density of 16.03Wh/kg,which is 17.2 times larger than that of the NiO pseudocapacitor.