• 文献标题:   Lamellar Oxygen-Enriched Graphene Hydrogel with Linking-up Network Porous Structure for High-Performance Supercapacitors
  • 文献类型:   Article
  • 作  者:   WANG XT, YANG YY, ZHANG QC, YANG X, HU ZG
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF PHYSICAL CHEMISTRY C
  • ISSN:   1932-7447
  • 通讯作者地址:   Northwest Normal Univ
  • 被引频次:   6
  • DOI:   10.1021/acs.jpcc.7b12644
  • 出版年:   2018

▎ 摘  要

Here, we report a lamellar holey oxygen-enriched graphene hydrogel (LGH) consisting of graphene sheets with a large amount of oxygen functional groups and in-plane pores and confirm its excellent supercapacitive performances. LGH is quite different from the traditional graphene hydrogel in terms of both the morphology and porous structure. Importantly, the in-plane pores on the graphene sheets link up the out-of-plane interval between the graphene sheets to form a linking-up network porous structure. The in-plane pores result in more micropores and the additional oxygen functional groups on graphene sheets. The LGH single electrode exhibits an ultrahigh capacitance (337.8 F g(-1) at 1 A g(-1)) and excellent rate capability (the specific capacitance at 100 A g(-1) retains 77% relative to 1 A g(-1)). The asymmetric supercapacitor is assembled by using the LGH as positive electrode material and the graphene hydrogel that has adsorbed anthraquinone as negative electrode material, respectively. The device exhibits a high energy storage (energy density of 31.5 Wh kg(-1) along with power density of 0.9 kW kg(-1)).