Preparation of Graphene Nanosheets (GSs) from Graphite Oxide by Thermal Exfoliation Method and Their Supercapacitive Behaviors

Preparation of Graphene Nanosheets (GSs) from Graphite Oxide by Thermal Exfoliation Method and Their Supercapacitive Behaviors

06Supercapacitor is widely used for energy capture and storage applications due to great power density, long cycling life and high energy density. Electrode material is one of the most important factors that affect the performance of the super capacitor and the production cost. Graphene has attracted tremendous attention on account of its unique physical, chemical, and mechanical properties.

Recently, graphene preparation from thermal exfoliation for supercapacitors has been intensively investigated. Based on the method of thermal exfoliation of graphite oxide (GO), the effect of thermal reduction temperature on the structure and capacitive performance of graphene has not been reported before.

Xian et al. obtained GSs after the treated GO was put into tube furnace heated to given temperature (nitrogen protection, 373, 473, 673, 873, and 1073 K) for 30 min. The experiment 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. 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 Fg-1) in a 6 mol L-1 KOH electrolyte and cycle stability.

Original article citation

Haiyang Xian, Tongjiang Peng, Hongjuan Sun, Jiande Wang.“The Effect of Thermal Exfoliation Temperature on the Structureand Supercapacitive Performance of Graphene Nanosheets”, Nano-Micro Lett. 7(1): 1726 (2015). doi:10.1007%2Fs40820-014-0014-4

A Highlight from Changlin Li for NMSTR.

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