NiMn2O4 Nanosheet Arrays with Controlled Mass Loading as Pseudocapacitor Electrodes
Nanostructured binary transition metal oxides are expected to possess better pseudocapacitive performance than that of mono-metal oxides.Herein, NiMn2O4 nanosheet arrays are grown on the Ni foam successfully with using the facile hydrothermal method and post-annealing.The surface morphology, composition and structure of as-synthesized products are investigated by Field emission scanning electron microscope, energy-dispersive X-ray spectroscopy and X-ray diffraction.The electrochemical performance is evaluated by cyclic voltammetry and galvanostatic charge-discharge tests.The results show that the thickness ofnanosheets varied from 7 nm to 25 nm with changing the reaction temperature from 40 to 220 ℃, the density of nanosheets are also present the increasing trend, and through which the mass loading of as-synthesized nanostructurs is controlled.The NiMn2O4 electrodes fabricated at higher reactiontemperature exhibit better electrochemical performance due to the raising mass loading of active electrode materials with the temperature.Moreover, the electrodes achieved at 220 ℃ offer a highest specific capacitance of 177.2 mF/cm2 at scan rate of 2 mV/s and good cycling stability with 89 % initial capacitance retention after 5000 cycles at a current density of l0 mA/cm2 in 1 M Na2SO4 electrolyte.
NiMn2O4 Nanosheet Arrays Mass Loading Pseudocapacitor
Lu Xiang Jun Shen Lu-qiang Lv Xu Li Shuang-yi Liu Zhen-hu Li
State Key Laboratory of Mechanical Transmission, College of Material Science and Engineering, Chongq Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and I
国际会议
The 2016 China Functional Materials Technology and Industry Forum (2016中国国际功能材料大会暨第九届中国功能材料及其应用学术会议)
重庆
英文
678-682
2016-07-25（万方平台首次上网日期，不代表论文的发表时间）