Jump to main content
Jump to site search


Interpenetrated nano-MOFs for ultrahigh-performance supercapacitors and excellent dye adsorption performance

Author affiliations

Abstract

Designing and preparing kinetically stable metal–organic frameworks through ligand functionalization can effectively improve their supercapacitive performances. Herein, we have successfully synthesized a novel polythreaded Co-based MOF by choosing a flexible N-donor ligand and a rigid multicarboxylate linker, [Co(HTATB)(dib)]·2H2O (1), where dib is the flexible N-donor 1,4-di(1H-imidazol-1-yl)butane linker and HTATB is the deprotonation mode from 4,4′,4′′-s-triazine-2,4,6-triyl-tribenzoic acid. The bulk Co-MOFs crystals and the corresponding nanorod powders have been evaluated as electrode materials for supercapacitors. The maximum gravimetric capacitance of the nanorod electrode is 2405 F g−1 at 0.75 A g−1 in 4 M KOH, which is higher than 1 M and 6 M KOH solution and seven times larger than that of the bulk-crystal electrode. Furthermore, the nanorod electrode also exhibits excellent Coulombic efficiency (92.2%), rate capability (53.5% after 20 times increase) and good cycling performance (93.5% after 3000 continuous cycles). The excellent electrochemical property may be ascribed to the 3D networks constructed from 2D entangled layered structures facilitating electron transport, sufficient interlayer spaces available for the storage and diffusion of OH ions, and the small-size effect of the nanorods. Further, the dye adsorption performance of crystalline 1 for methyl orange and Congo red has also been investigated.

Graphical abstract: Interpenetrated nano-MOFs for ultrahigh-performance supercapacitors and excellent dye adsorption performance

Back to tab navigation

Supplementary files

Publication details

The article was received on 29 Jun 2018, accepted on 30 Sep 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8CE01067F
Citation: CrystEngComm, 2018, Advance Article
  •   Request permissions

    Interpenetrated nano-MOFs for ultrahigh-performance supercapacitors and excellent dye adsorption performance

    K. Wang, X. Wang, D. Zhang, H. Wang, Z. Wang, M. Zhao, R. Xi, H. Wu and M. Zheng, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE01067F

Search articles by author

Spotlight

Advertisements