title: NH3 assisted photoreduction and N-doping of graphene oxide for high performance electrode materials in supercapacitors.
abstract: Nitrogen-doped graphene was synthesized by simple photoreduction of graphene oxide (GO) deposited on nickel foam under NH3 atmosphere. The combination of photoreduction and NH3 not only reduces the GO in a shorter time but also induces nitrogen doping easily. The nitrogen doped content of N-rGO@NF reaches a high of 5.99 at% with 15 min of irradiation. The nitrogen-doped graphene deposited on Ni foam (N-rGO@NF) can be directly used as an electrode for supercapacitors, without any conductive agents and polymer binders. In the electrochemical measurement, N-rGO@NF displays remarkable electrochemical performance. In particular, the N-rGO@NF irradiated for 45 min at a high current density of 92.3 A g(-1) retained about 77% (190.4 F g(-1)) of its initial specific capacitance (247.1 F g(-1) at 0.31 A g(-1)). Furthermore, the stable voltage window could be extended to 2.0 and 1.5 V by using Li2SO4 and a mixed Li2SO4/KOH electrolyte, and the maximum energy density was high up to 32.6 and 21.2 Wh kg(-1), respectively. The results show that compared to Li2SO4, a mixed electrolyte (Li2SO4/KOH) more efficiently balances the relationship between the high energy densities and high power densities.
authors.affiliation: Jiangsu Key Laboratory for Nanotechnology, Nanjing National Laboratory of Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, P. R. China. tangsl@nju.edu.cn.
authors.forename: Haifu
authors.initials: H
authors.lastname: Huang
authors.forename: Guangsheng
authors.initials: G
authors.lastname: Luo
authors.forename: Lianqiang
authors.initials: L
authors.lastname: Xu
authors.forename: Chenglong
authors.initials: C
authors.lastname: Lei
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Tang
authors.forename: Shaolong
authors.initials: S
authors.lastname: Tang
authors.forename: Youwei
authors.initials: Y
authors.lastname: Du