材料科学
电致变色
共价键
结(造纸)
电荷(物理)
纳米技术
电极
有机化学
物理化学
复合材料
化学
物理
量子力学
作者
Yingying Hao,Bingwei Bao,Ran Li,Chengyi Hou,Yaogang Li,Qinghong Zhang,Kerui Li,Hongzhi Wang
标识
DOI:10.1021/acsami.4c13012
摘要
Due to the ordered one-dimensional channel as well as accessible redox sites, two-dimensional covalent organic frameworks (2D COFs) have garnered extensive attention in the field of electrochromism. However, organic 2D frameworks impose limitations on charge transfer and the weak interlayer interactions in 2D COFs, adversely affecting the stability during switching processes. Herein, we introduced Ti knots to construct three-dimensional metalated covalent organic frameworks (3D MCOFs), denoted as Ti-DHTA-Py. The Ti knots not only serve as templates for organizing organic units into unique 3D topological structures in a controlled manner but also establish charge transfer pathways conducive to electron delocalization and transmission within the framework. As a result, the 3D Ti-DHTA-Py MCOFs electrode exhibited a reduced band gap and remarkable electrochromic (EC) performances: electrochemical cyclic stability of 93.6% retention after 500 cycles, switching times (2.5 s/0.5 s), and a high coloration efficiency (423 cm
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