多孔Co_3O_4纳米片的制备及其电化学性能研究

Fabrication and Electrochemical Properties of Porous Co_3O_4 Nanoplates

采用溶剂热法制备片状Co(CO3)0.5(OH).0.11H2O前驱物,经400℃煅烧2 h即可得到多孔Co3O4纳米片.通过场发射扫描电镜(FESEM)和透射电镜(HRTEM)观测了纳米片的形貌,利用X射线衍射(XRD)分析了纳米片的结构,通过循环伏安、恒流充放电和交流阻抗测试了材料的电化学电容性能.结果表明:多孔Co3O4纳米片厚度约为50 nm,孔径主要分布在10 nm左右;0.5 A/g恒流充放电情况下,比容量高达707 F/g,当电流密度高达8 A/g时比容量依然高达547 F/g;同时,该材料循环1 000次后,容量保持率为97.4%.

Porous Co304 nanoplates prepared with a one-pot hydrothermal synthesis method were synthesized by calcining the precipitates Co（ CO3 ）0.5 （OH） ·O 0. 11H2O at 400 ℃ for 2h. That crystal structures and mor- phologies both of the precursors and products have been characterized with X-ray diffraction （XRD） , field e- mission scanning electron microscopic （FESEM）, high-resolution transmission electron microscopic （HR- TEM）. Electrochemical properties of the Co304 nanoplates were carried out using cyclic voltammetry, gal- vanostatic charge-discharge measurements and electrochemical impedance spectroscopy. The results showed that the porous Co304 nanoplates had the thickress of about 50 nm, pore sizes about 10 nm and exhibited high specific capacitances of 707 F/g at 0.5 A/g and 547 F/g at 8 A/g. Furthermore, the specific capacitance of the materials was 97.4% after cycling for 1000 times.