Supercapacitor performances of rich nitrogen-doped mesoporous graphene fabricated by a facile template-free copyrolysis process

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• 作者：Juan Xu ; Guoxin Wang ; Jianyu Cao ; Yufei Xue ; Yang Li ; Wenchang Wang ; Zhidong Chen
• 刊名：Ionics
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：22
• 期：7
• 页码：1177-1184
• 全文大小：1,102 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760
• 卷排序：22

文摘

Rich nitrogen-doped mesoporous graphene (NDMG) with a large specific surface area of 496.8 m2 g−1 and high electrical conductivity of 327.2 S cm−1, and suitable pore size was synthesized by a facile co-thermal annealing of pre-prepared phenolic polymer and dicyandiamide. The NDMG has a high nitrogen content (7.9 wt%) and can act as promising electroactive materials for two-electrode symmetric supercapacitors. The NDMG cells displayed a high specific capacitance of ca. 316 F g−1 at 0.5 A g−1, which is much higher than that of the pristine graphene devices (ca. 123 F g−1). Moreover, compared with the capacitance drop rate of pristine graphene devices (8.9 %), the specific capacitance of NDMG cells was decreased by only 3.2 % after 2000 cycles, exhibiting a good cycling performance and reversibility. In addition, the specific capacitance of the NDMG cells can reach 251 F g−1 at 5.0 A g−1, revealing an excellent rate capability and implying the ability to deliver a high energy density at a high power density. The good electrochemical performances of NDMG can be attributed to its high surface area, suitable mesopore size, and high electrical conductivity.KeywordsNitrogen-doped mesoporous graphene (NDMG)CopyrolysisSupercapacitorRate capability