標題: A Hollow Microtubular Triazine- and Benzobisoxazole-Based Covalent Organic Framework Presenting Sponge-Like Shells That Functions as a High-Performance Supercapacitor
作者: El-Mahdy, Ahmed F. M.
Hung, Ying-Hui
Mansoure, Tharwat Hassan
Yu, Hsiao-Hua
Chen, Tao
Kuo, Shiao-Wei
交大名義發表
National Chiao Tung University
關鍵字: benzobisoxazole;covalent organic frameworks;energy storage;supercapacitors;triazines;tubular structures
公開日期: 2-May-2019
摘要: In this paper we report the construction of a hollow microtubular triazine- and benzobisoxazole-based covalent organic framework (COF) presenting a sponge-like shell through a template-free [3+2] condensation of the planar molecules 2,4,6-tris(4-formylphenyl)triazine (TPT-3CHO) and 2,5-diaminohydroquinone dihydrochloride (DAHQ-2HCl). The synthesized COF exhibited extremely high crystallinity, a high surface area (ca. 1855m(2)g(-1)), and ultrahigh thermal stability. Interestingly, a time-dependent study of the formation of the hollow microtubular COF having a sponge-like shell revealed a transformation from initial ribbon-like crystallites into a hollow tubular structure, and confirmed that the hollow nature of the synthesized COF was controlled by inside-out Ostwald ripening, while the non-interaction of the crystallites on the outer surface was responsible for the sponge-like surface of the tubules. This COF exhibited significant supercapacitor performance: a high specific capacitance of 256Fg(-1) at a current density of 0.5Ag(-1), excellent cycling stability (98.8% capacitance retention over 1850cycles), and a high energy density of 43Whkg(-1). Such hollow structural COFs with sponge-like shells appear to have great potential for use as high-performance supercapacitors in energy storage applications.
URI: http://dx.doi.org/10.1002/asia.201900296
http://hdl.handle.net/11536/152419
ISSN: 1861-4728
DOI: 10.1002/asia.201900296
期刊: CHEMISTRY-AN ASIAN JOURNAL
Volume: 14
Issue: 9
起始頁: 1429
結束頁: 1435
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