Imine-based nickel/cobalt covalent organic framework with high rate and stability for supercapacitor

Guanwen Wang, Chunlei Chi, Zheng Liu, Zhuangjun Fan
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引用次数: 0

Abstract

Due to their regular pore structure, long-range order, and structural stability, COFs (Covalent Organic Frameworks) have gradually been employed as electrode materials for supercapacitors. However, owing to their two-dimensional stacking structure, poor conductivity, and the lack of effective redox-active sites, they usually exhibit inferior rate performance and cycling stability. Therefore, we design an imine-based Ni0.7Co0.3-COF anchored with Ni/Co redox centres at the atomic level and adjust their proportion. This approach optimizes the electronic structure and enhances the electronic conductivity and redox activity of Ni0.7Co0.3-COF. Ni0.7Co0.3-COF are grown through thin-layered cross-linking, significantly shortening both the ion and electron transport pathways. This improves the contact area between electrolyte ions and electrode materials and enhances the utilization of redox centres, thereby substantially improving the rate performance (1300 F g−1 at 50 A g−1) and cycling stability (72% retention after 5000 cycles) of Ni0.7Co0.3-COF.
用于超级电容器的具有高速率和高稳定性的亚胺基镍/钴共价有机框架
由于具有规则的孔隙结构、长程有序性和结构稳定性,共价有机框架(COFs)已逐渐被用作超级电容器的电极材料。然而,由于其二维堆叠结构、导电性差以及缺乏有效的氧化还原活性位点,它们通常表现出较低的速率性能和循环稳定性。因此,我们设计了一种亚胺基 Ni0.7Co0.3-COF,在原子水平上锚定了 Ni/Co 氧化还原中心,并调整了它们的比例。这种方法优化了 Ni0.7Co0.3-COF 的电子结构,提高了其电子导电性和氧化还原活性。Ni0.7Co0.3-COF 通过薄层交联生长,大大缩短了离子和电子的传输路径。这改善了电解质离子与电极材料之间的接触面积,提高了氧化还原中心的利用率,从而大大提高了 Ni0.7Co0.3-COF 的速率性能(50 A g-1 时 1300 F g-1)和循环稳定性(5000 次循环后 72% 的保留率)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
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