Title of article :
Structural evolution during annealing of thermally reduced graphene nanosheets for application in supercapacitors Original Research Article
Author/Authors :
Cheng-meng Chen، نويسنده , , Qiang Zhang، نويسنده , , Mang-Guo Yang، نويسنده , , Chun-Hsien Huang، نويسنده , , Yonggang Yang، نويسنده , , Mao-Zhang Wang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
13
From page :
3572
To page :
3584
Abstract :
The surface functional groups of thermally reduced graphene nanosheets (TRG) prepared by vacuum promoted thermal expansion of graphene oxide are tailored by progressive carbonization. The residual carbon ratios after annealing at various temperatures from 250 to 1000 °C increase progressively from 44.3 to 84.8%. The oxygen containing functional groups are intensively removed at higher annealing temperature. The thermally stable phenols, ethers, and carbonyls become the major components in 1000 °C annealed TRG. Though the starting material G250 owns a high specific capacitance of 170.5 F/g, the value decreases to only 47.5 F/g when the annealing temperature is increased to 1000 °C. The oxygen containing functional groups can enhance the capacitance performance of TRGs by introducing abundant pseudocapacitance active sites through reversible Faradic redox reactions. The correlation between the structural evolution and electrochemical performance of TRGs provides new insight for designing graphene based electrodes with controllable properties for advanced supercapacitors.
Journal title :
Carbon
Serial Year :
2012
Journal title :
Carbon
Record number :
1124210
Link To Document :
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