Xian Haiyang, Peng Tongjiang, Sun Hongjuan, Wang Jiande
1Institute of Mineral Materials & Application, Southwest University of Science and Technology, Mianyang, 621010 People's Republic of China.
2School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010 People's Republic of China.
Nanomicro Lett. 2015;7(1):17-26. doi: 10.1007/s40820-014-0014-4. Epub 2014 Oct 31.
Graphene nanosheets (GSs) were prepared from graphite oxide by thermal exfoliation method. The effect of thermal exfoliation temperature on the structure and supercapacitive performance of GSs has been investigated. The results show that the GSs with pore sizes center around 4.0 nm. With an increase of thermal reduction temperature, the number of stacking layers and the structure disorder degree increase, while the oxygen-containing groups content, BET surface area, and electrical resistivity of GSs decrease. The results indicate that 673 K is the preferable thermal exfoliation temperature to acquire good supercapacitive performance. In this case, the GSs have the best supercapacitive performance (233.1 F g) in a 6 mol L KOH electrolyte. The prepared GSs at the preferable thermal exfoliation temperature have good rate performance and cycle stability.
通过热剥离法由氧化石墨制备了石墨烯纳米片（GSs）。研究了热剥离温度对GSs结构和超级电容性能的影响。结果表明，GSs的孔径集中在4.0nm左右。随着热还原温度的升高，GSs的堆叠层数和结构无序度增加，而含氧基团含量、比表面积和电阻率降低。结果表明，673K是获得良好超级电容性能的最佳热剥离温度。在此情况下，GSs在6mol/L KOH电解液中具有最佳的超级电容性能（233.1F/g）。在最佳热剥离温度下制备的GSs具有良好的倍率性能和循环稳定性。
