ABSTRACT

In this study, a simple and one-step cost-effective preparation of rGO/Co3O4 nanocomposite was given out in different monomer concentrations of [rGO]o/[Co3O4]o= 1:1; 1:2; 1:5 and 1:10. The electroactive materials were characterized by many techniques, such as FTIR-ATR, XPS, TGA-DTA, Raman, BET surface analysis, GCD, SEM-EDX, XRD, TEM, CV, and EIS analysis. A symmetric supercapacitor applying rGO/Co3O4 nanocomposite as positive and negative electrodes was taken in the potential window between 0.0 and 0.8 V as the highest specific capacitance of Csp= 115.35 F×g-1 at 2 mV×s-1 for [rGO]o/[Co3O4]o= 1:2. Furthermore, the highest energy (E) and power densities (P) were obtained as E= 20.16 Wh×kg-1 at 40 mA and P= 26.140 kW×kg-1 at 10 mA for [rGO]o/[Co3O4]o= 1:2 by GCD method, respectively. As a result, rGO/Co3O4 nanocomposite at different monomer concentrations showed an easy synthesis, a sustainable approach, and a high electrochemical performances for energy storage devices.

摘要

在这项研究中，在[rGO]o/[Co3O4]o= 1:1 的不同单体浓度下，提出了一种简单且一步成本效益高的rGO/Co3O4 纳米复合材料制备方法；1:2; 1:5 和 1:10。采用多种技术对电活性材料进行表征，如FTIR-ATR、XPS、TGA-DTA、拉曼、BET表面分析、GCD、SEM-EDX、XRD、TEM、CV和EIS分析。采用 rGO/Co3O4 纳米复合材料作为正极和负极的对称超级电容器，在 0.0 和 0.8 V 之间的电位窗口中作为 [rGO]o 在 2 mV×s-1 时 Csp= 115.35 F×g-1 的最高比电容/[Co3O4]o= 1:2。此外，对于 [rGO]o/[Co3O4]o，在 40 mA 时 E = 20.16 Wh×kg-1 和在 10 mA 时 P = 26.140 kW×kg-1 获得最高能量 (E) 和功率密度 (P) = 1:2 通过 GCD 方法，分别。因此，