Niobium doped triazine based covalent organic frameworks for supercapacitor applications

超级电容器 三嗪 兴奋剂 共价有机骨架 水平扫描速率 共价键 纳米技术 材料科学 化学工程 电化学 多孔性 化学 循环伏安法 复合材料 光电子学 有机化学 冶金 电容 高分子化学 电极 物理化学 工程类
作者
H. Shanavaz,B.P. Prasanna,S. Archana,M.K. Prashanth,Fahad A. Alharthi,Rui Zhou,M.S. Raghu,Byong‐Hun Jeon,K. Yogesh Kumar
出处
期刊:Journal of energy storage [Elsevier BV]
卷期号:67: 107561-107561 被引量:24
标识
DOI:10.1016/j.est.2023.107561
摘要

Covalent organic frameworks (COFs) are gaining high importance in energy storage systems due to their uniform porosity and versatile functionality. The present work deals with the fabrication of triazine-based COF through Schiff base formation. The method involves the polycondensation reaction between melamine and terephthalaldehyde. In addition, the COF was also decorated with Niobium to generate Nb@COF. The morphological, elemental mapping, X-ray photoelectron spectroscopy, C13 NMR results show the effective doping of Nb to the COF and provide insights into the nature of bond formation. The obtained experimental XRD results are in good agreement with Materials Studio simulated results. COF and Nb@COF have been used for supercapacitor applications in a three-electrode system. Enhanced specific capacitance was observed in Nb@COF (367 F g−1) compared to pure COF (244 F g−1) at a scan rate of 2 mV s−1. The superior electrochemical performance in Nb@COF could be due to the increased porosity and interlayer spacing. COF and Nb@COF exhibited good stability towards charge and discharge and managed to retain 82 and 89 % specific capacitance, respectively even at 5000 cycles. COF and Nb@COF were assembled in a coin cell and fabricated an asymmetric supercapacitor device as negative and positive electrodes, respectively. The results obtained were satisfactory and shows a specific capacitance of 87 F g−1 at a scan rate of 2 mV s−1.The good stability, specific capacitance and reliability of Nb@COF indicate its potential application in energy storage devices.
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