Materials Science and Technology Division, Oak Ridge National Laboratory , P.O. Box 2008, MS-6087, Oak Ridge, Tennessee 37831, United States.
ACS Appl Mater Interfaces. 2012 Jun 27;4(6):3239-46. doi: 10.1021/am300593k. Epub 2012 Jun 18.
Graphene materials were synthesized by reduction of exfoliated graphite oxide and then thermally treated in nitrogen to improve the surface area and their electrochemical performance as electrical double-layer capacitor electrodes. The structural and surface properties of the prepared reduced graphite oxide (RGO) were investigated using atomic force microscopy, scanning electron microscopy, Raman spectra, X-ray diffraction pattern analysis, and nitrogen adsorption/desorption studies. RGO forms a continuous network of crumpled sheets, which consist of large amounts of few-layer and single-layer graphenes. Electrochemical studies were conducted by cyclic voltammetry, impedance spectroscopy, and galvanostatic charge-discharge measurements. The modified RGO materials showed enhanced electrochemical performance, with maximum specific capacitance of 96 F/g, energy density of 12.8 Wh/kg, and power density of 160 kW/kg. These results demonstrate that thermal treatment of RGO at selected conditions is a convenient and efficient method for improving its specific capacitance, energy, and power density.
通过还原剥离的氧化石墨并在氮气中进行热处理，合成了石墨烯材料，以提高其表面积和作为电化学双层电容器电极的电化学性能。使用原子力显微镜、扫描电子显微镜、拉曼光谱、X 射线衍射图谱分析和氮气吸附/解吸研究对制备的还原氧化石墨（RGO）的结构和表面性质进行了研究。RGO 形成了褶皱片的连续网络，其中包含大量的少层和单层石墨烯。通过循环伏安法、阻抗谱和恒流充放电测量进行了电化学研究。改性后的 RGO 材料表现出增强的电化学性能，最大比电容为 96 F/g，能量密度为 12.8 Wh/kg，功率密度为 160 kW/kg。这些结果表明，在选定条件下对 RGO 进行热处理是一种简便有效的方法，可以提高其比电容、能量和功率密度。
