石墨烯
超级电容器
石墨烯量子点
电容
量子点
电极
材料科学
复合数
纳米技术
自愈水凝胶
化学工程
化学
复合材料
高分子化学
工程类
物理化学
作者
Lanshu Xu,Chen Cheng,Yao Chen,Xiaojuan Jin
标识
DOI:10.1016/j.orgel.2019.105407
摘要
In this work, a lignosulfonate has been used for synthesizing the graphene quantum dots (GQDs) with many functional groups by a two-step method. Then a graphene-based composite hydrogel (GH-GQD) was obtained through the modification of the functionalized GQDs. Results showed that the composite hydrogel had a highly porous structure and numerous active sites. Accordingly, the assembled GH-GQD electrode exhibited an impressive specific capacitance of 451.7 F g−1 at a current density of 0.5 A g−1, a good cycle stability (89.0% capacitance retention after 10000 charge/discharge cycles) and mechanical flexibility (93.3% capacitance retention bent to 180°). The present findings indicate a great potential of the graphene hydrogels modified with the functionalized GQDs in fabricating flexible supercapacitor electrodes.
科研通智能强力驱动
Strongly Powered by AbleSci AI