A modified molten-salt method to prepare graphene electrode with high capacitance and low self-discharge rate

作者：Wang, Jie; Ding, Bing; Hao, Xiaodong; Xu, Yunling; Wang, Ya; Shen, Laifa; Dou, Hui; Zhang, Xiaogang^*

来源：Carbon, 2016, 102: 255-261.

DOI：10.1016/j.carbon.2016.02.047

• HIGH-PERFORMANCE SUPERCAPACITORS
• NANOTUBE BASED SUPERCAPACITORS
• CARBON MATERIALS
• ENERGY-STORAGE
• OXIDE
• REDUCTION
• NANOSHEETS
• SPECTROSCOPY
• BATTERIES
• MESOPORES

Graphene is known to suffer from severe aggregation and incomplete recovery of a pi-pi conjugated system during the reduction process from graphene oxide. Here we report that these issues can be addressed by using a modified molten salt system. The advantages of the molten salt for reducing graphene show in three aspects: (i) prevent restacking; (ii) restore the conjugated network; (iii) serve as reaction medium for KNO3 activation and nitrogen doping. The molten-salt method-derived graphene (MNG) displays a highly sp(2)-hybrid constitution, nitrogen doping and hierarchically porous structure. With this design, the MNG-based supercapacitor manifests outstanding specific capacitance (234 F g(-1) and 130 F g(-1) in 6 M KOH and EMIMBF4 electrolyte, respectively), high power density, combined with excellent cycling stability and low self-discharge rate. The facile and scalable features of this strategy will be helpful for the rational design of functionalized graphene-based materials for diverse applications.

• 出版日期2016-6
• 单位南京航空航天大学