Facial synthesis of nanostructured ZnCo2O4 on carbon cloth for supercapacitor application

2017 International Conference on Material Engineering and Advanced Manufacturing Technology

Patil, Swati J.^1 ; Park, Jungsung^1 ; Lee, Dong-Weon^1

School of Mechanical Systems Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju

500757, Korea, Republic of^1

关键词: Electrochemical analysis;    Electrode material;    Field emission scanning electron microscopy;    Frequency dependent;    Hydrothermal methods;    Impedance analysis;    Specific capacitance;    Supercapacitor application;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/282/1/012004/pdf
DOI  :  10.1088/1757-899X/282/1/012004

来源: IOP

【 摘 要 】

In this work, we have synthesized the ZnCo2O4electrode by a facial one-step hydrothermal method on a carbon cloth for the supercapacitor application. The structural and phase purity of the prepared electrode material was confirmed by X-ray diffraction (XRD) technique. The surface morphology and elemental stoichiometry were studied using field emission scanning electron microscopy (FE-SEM). The FE-SEM micrograph illustrates that the ZnCo2O4material is composed of microstrips with a ∼0.5 μm width and length in micron uniformly covered the carbon cloth surface. The ZnCo2O4electrode material further investigated for electrochemical analyses. The cyclic voltammetry results showed that the ZnCo2O4microstrips electrode exhibited the highest specific capacitance of 1084 F/g at 2 mV/s scan rate. Remarkably, a maximum energy density of 12.5 Wh/kg was attained at a current density of 2 mA/cm2 with the power density of 3.6 kW/kg for the ZnCo2O4microstrips electrode. Furthermore, the 96.2 % capacitive retention is obtained at a higher scan rate of 100 mV/s after 1000 CV cycles, indicating excellent cycling stability of the ZnCo2O4microstrips electrode. The frequency-dependent rate capability and an ideal capacitive behaviour of the ZnCo2O4microstrips electrode were analyzed using impedance analyses; a representing the ion diffusion structure of the material. These results show that the ZnCo2O4microstrips electrode could be a promising material for supercapacitor application.