简易合成MgCo_(2)O_(4)纳米线及其电化学性能研究

Facile synthesis and electrochemical properties of MgCo_(2)O_(4) nanowires

通过水热路径引入表面活性剂十二烷基磺酸钠在泡沫镍上成功合成出比表面积较大、超薄多孔的MgCo_(2)O_(4)纳米线。研究表明,MgCo_(2)O_(4)纳米线展示出紧密交织透明的网格状结构且在5 A/g的电流密度下,比电容高达2128 F/g。在40 A/g的情况下循环6000周次后,比电容保持了原始容量的98.4%。将该纳米线和活性炭分别作为正极和负极组装成非对称超级电容器,其比电容可达65.32 F/g且在功率密度为338.95 W/kg下能量密度可达20.41 Wh/kg。上述结果表明该非对称超级电容器是一个较好的储能装置,在实际应用中拥有良好的潜力。

Ultra-thin and porous MgCo_(2)O_(4) nanowires with larger specific surface area was successfully synthesized on Ni foam by hydrothermal method with surfactant sodium dodecylsulphate.It showed that MgCo_(2)O_(4) nanowires exhibited a dense interwoven and transparent net-like structure with a high specific capacitance of 2128 F/g at a current of 5 A/g.After 6000 cycles under the condition of 40 A/g,98.4%of initial capacitance was retained.Additionally,asymmetric supercapacitor was assembled with this nanowires as binder-free positive electrode and activated carbon as negative electrode respectively,which displayed a specific capacitance of 65.32 F/g and energy density of 20.41 Wh/kg under the power density of 338.95 W/kg.The above results show that the asymmetric supercapacitor is a good energy storage device which has good potential in practical applications.