分级多孔石墨烯/活性炭复合材料的制备及其电化学电容性能分析
Preparation and electrochemical capacitance properties analysis of hierarchically porous graphene/activated carbon composites
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摘要: 采用液相共混法,以酚醛树脂和氧化石墨为原料,得到氧化石墨烯/酚醛树脂复合材料,再通过高温碳化和活化工艺,制备出石墨烯/活性炭复合材料.采用循环伏安和恒流充放电测试表征其电化学电容性能,结果表明:该复合材料在0.5 A·g-1的电流密度下比电容高达197 F·g-1,当电流密度增加到10 A·g-1时,比电容为163 F·g-1,电流增加20倍,电容保持率为83%,在0.5 A·g-1的电流密度下循环1000次,未见容量有衰减,电容保持率为100%.这表明该复合材料具有优良的电容性能.
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关键词:
- 氧化石墨烯 /
- 酚醛树脂 /
- 石墨烯/活性炭复合材料 /
- 分级多孔 /
- 电化学电容性能
Abstract: The graphene/phenolic resin composites were prepared by liquid phase blending method using phenolic resin and graphene oxide as raw materials, and then graphene/activated carbon composites were prepared by high temperature carbonization and activation process. Cyclic voltammetry and constant current charge-discharge tests were used to characterize the electrochemical capacitance. The results showed that the composite had a specific capacitance of 197 F·g-1 at a current density of 0.5 A·g-1, and the current density increased to 10 A·g-1, the specific capacitance was 163 F·g-1, the current was increased by 20 times, the capacitance retention rate was 83%, and the cycle was repeated 1000 times at a current density of 0.5 A·g-1, and no capacity was attenuated, the capacity retention rate was 100%, which indicated that the composite material had excellent capacitance properties. -
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