ZIF-8@MWCNT-derived carbon composite as electrode of high performance for supercapacitor. (20th September 2016)

• Record Type: Journal Article
• Authors: Wang, Yanfang; Chen, Bingwei; Zhang, Yi; Fu, Lijun; Zhu, Yusong; Zhang, Lixin; Wu, Yuping
• Is Part Of: Electrochimica acta. Volume 213(2016)
• Page Start: 260
• Page End: 269
• Publication Date: 2016-09-20
• Subjects: supercapacitor -- zeolitic imidazolate framework -- ZIF-8 -- porous carbon; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.07.019
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Necklace architectures with ZIF-8 nanocrystals strung on MWCNTs are obtained. "Necklace" derived carbons exhibit hierarchical micro-mesoporous structures. The carbon exhibits excellent rate and cycling capability. The capacitance retention after 10000 cycles at 10 A·g −1 is 99.7%. The synergistic interactions contribute to the excellent performances. Abstract: Carbon materials from zeolitic imidazolate framework (ZIF) present poor electrochemical performance as electrode materials for supercapacitors. In this work, well-intergrown ZIF nanocystals are strung on MWCNTs to form necklace architecture. After carbonization and chemical etching, porous carbons with necklace architecture and proper hierarchical micro-mesoporous structure were obtained. It exhibits excellent electrochemical performance as electrode material for supercapacitor in 1 M H2 SO4 solution such as high specific capacitance up to 326 F·g −1 at 1 A·g −1, good rate capability and excellent cycling stability of 99.7% capacitance retention after 10000 cycles. The main reasons are due to the increased surface area, the improved electrical conductivity, and the combination of micro- and meso-porous structure. This provides another promising way to design porous carbons from ZIF materials for supercapacitors.