title: Supercapacitor electrode materials with hierarchically structured pores from carbonization of MWCNTs and ZIF-8 composites.
abstract: Due to their high specific surface area and good electric conductivity, nitrogen-doped porous carbons (NPCs) and carbon nanotubes (CNTs) have attracted much attention for electrochemical energy storage applications. In the present work, we firstly prepared MWCNT/ZIF-8 composites by decoration of zeolitic imidazolate frameworks (ZIF-8) onto the surface of multi-walled CNTs (MWCNTs), then obtained MWCNT/NPCs by the direct carbonization of MWCNT/ZIF-8. By controlling the reaction conditions, MWCNT/ZIF-8 with three different particle sizes were synthesized. The effect of NPCs size on capacitance performance has been evaluated in detail. The MWCNT/NPC with large-sized NPC (MWCNT/NPC-L) displayed the highest specific capacitance of 293.4 F g-1at the scan rate of 5 mV s-1and only lost 4.2% of capacitance after 10 000 cyclic voltammetry cycles, which was attributed to the hierarchically structured pores, N-doping and high electrical conductivity. The studies of symmetric two-electrode supercapacitor cells also confirmed MWCNT/NPC-L as efficient electrode materials that have good electrochemical performance, especially for high-rate applications.
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P.R. China. yhzhu@ecust.edu.cn and CAS Key Laboratory for Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P.R. China. LUCG@nanoctr.cn.
authors.forename: Xueqin
authors.initials: X
authors.lastname: Li
authors.affiliation: CAS Key Laboratory for Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P.R. China. LUCG@nanoctr.cn.
authors.forename: Changlong
authors.initials: C
authors.lastname: Hao
authors.affiliation: CAS Key Laboratory for Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P.R. China. LUCG@nanoctr.cn.
authors.forename: Bochong
authors.initials: B
authors.lastname: Tang
authors.affiliation: CAS Key Laboratory for Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P.R. China. LUCG@nanoctr.cn and China University of Petroleum, Changping, Beijing 102249, P.R. China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory for Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P.R. China. LUCG@nanoctr.cn and China University of Petroleum, Changping, Beijing 102249, P.R. China.
authors.forename: Mei
authors.initials: M
authors.lastname: Liu
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P.R. China. yhzhu@ecust.edu.cn.
authors.forename: Yuanwei
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P.R. China. yhzhu@ecust.edu.cn.
authors.forename: Yihua
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: CAS Key Laboratory for Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P.R. China. LUCG@nanoctr.cn and University of Chinese Academy of Sciences, 19 A Yuquan Rd, Shijingshan District, Beijing, 100049 P.R. China.
authors.forename: Chenguang
authors.identifier: http://orcid.org/0000-0003-2133-0079
authors.initials: C
authors.lastname: Lu
authors.affiliation: CAS Key Laboratory for Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P.R. China. LUCG@nanoctr.cn and University of Chinese Academy of Sciences, 19 A Yuquan Rd, Shijingshan District, Beijing, 100049 P.R. China.
authors.forename: Zhiyong
authors.identifier: http://orcid.org/0000-0003-0610-0064
authors.initials: Z
authors.lastname: Tang