title: A honeycomb-like porous carbon derived from pomelo peel for use in high-performance supercapacitors.
abstract: A cost-effective approach to obtain electrode materials with excellent electrochemical performance is critical to the development of supercapacitors (SCs). Here we report the preparation of a three-dimensional (3D) honeycomb-like porous carbon (HLPC) by the simple carbonization of pomelo peel followed by KOH activation. Structural characterization indicates that the as-prepared HLPC with a high specific surface area (SSA) up to 2725 m(2) g(-1) is made up of interconnected microporous carbon walls. Chemical analysis shows that the HLPC is doped with nitrogen and also has oxygen-containing groups. Electrochemical measurements show that the HLPC not only exhibits a high specific capacitance of 342 F g(-1) and 171 F cm(-3) at 0.2 A g(-1) but also shows considerable rate capability with a retention of 62% at 20 A g(-1) as well as good cycling performance with 98% retention over 1000 cycles at 10 A g(-1) in 6 M KOH. Furthermore, an as-fabricated HLPC-based symmetric SC device delivers a maximum energy density of ∼9.4 Wh kg(-1) in the KOH electrolyte. Moreover, the outstanding cycling stability (only 2% capacitance decay over 1000 cycles at 5 A g(-1)) of the SC device makes it promising for use in a high-performance electrochemical energy system.
authors.affiliation: Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China. yang.quanhong@sz.tsinghua.edu.cn.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Liang
authors.forename: Ling
authors.initials: L
authors.lastname: Ye
authors.forename: Zheng-Hong
authors.initials: ZH
authors.lastname: Huang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xu
authors.forename: Yu
authors.initials: Y
authors.lastname: Bai
authors.forename: Feiyu
authors.initials: F
authors.lastname: Kang
authors.forename: Quan-Hong
authors.initials: QH
authors.lastname: Yang