title: 3D MnO2-graphene composites with large areal capacitance for high-performance asymmetric supercapacitors.
abstract: In this paper, we reported an effective and simple strategy to prepare large areal mass loading of MnO2 on porous graphene gel/Ni foam (denoted as MnO2/G-gel/NF) for supercapacitors (SCs). The MnO2/G-gel/NF (MnO2 mass: 13.6 mg cm(-2)) delivered a large areal capacitance of 3.18 F cm(-2) (234.2 F g(-1)) and good rate capability. The prominent electrochemical properties of MnO2/G-gel/NF are attributed to the enhanced conductivities and improved accessible area for ions in electrolytes. Moreover, an asymmetric supercapacitor (ASC) based on MnO2/G-gel/NF (MnO2 mass: 6.1 mg cm(-2)) as the positive electrode and G-gel/NF as the negative electrode achieved a remarkable energy density of 0.72 mW h cm(-3). Additionally, the fabricated ASC device also exhibited excellent cycling stability, with less than 1.5% decay after 10,000 cycles. The ability to effectively develop SC electrodes with high mass loading should open up new opportunities for SCs with high areal capacitance and high energy density.
authors.affiliation: KLGHEI of Environment and Energy Chemistry, MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingang West Road, Chemical North Building 325, Guangzhou 510275, People's Republic of China.
authors.forename: Teng
authors.initials: T
authors.lastname: Zhai
authors.forename: Fuxin
authors.initials: F
authors.lastname: Wang
authors.forename: Minghao
authors.initials: M
authors.lastname: Yu
authors.forename: Shilei
authors.initials: S
authors.lastname: Xie
authors.forename: Chaolun
authors.initials: C
authors.lastname: Liang
authors.forename: Cheng
authors.initials: C
authors.lastname: Li
authors.forename: Fangming
authors.initials: F
authors.lastname: Xiao
authors.forename: Renheng
authors.initials: R
authors.lastname: Tang
authors.forename: Qixiu
authors.initials: Q
authors.lastname: Wu
authors.forename: Xihong
authors.initials: X
authors.lastname: Lu
authors.forename: Yexiang
authors.initials: Y
authors.lastname: Tong