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ACS Nano. 2015 Mar 24;9(3):3178-83. doi: 10.1021/acsnano.5b00184. Epub 2015 Feb 17.

Rapid and efficient redox processes within 2D covalent organic framework thin films.

Author information

1
Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory, Ithaca, New York 14853-1301, United States.

Abstract

Two-dimensional covalent organic frameworks (2D COFs) are ideally suited for organizing redox-active subunits into periodic, permanently porous polymer networks of interest for pseudocapacitive energy storage. Here we describe a method for synthesizing crystalline, oriented thin films of a redox-active 2D COF on Au working electrodes. The thickness of the COF film was controlled by varying the initial monomer concentration. A large percentage (80-99%) of the anthraquinone groups are electrochemically accessible in films thinner than 200 nm, an order of magnitude improvement over the same COF prepared as a randomly oriented microcrystalline powder. As a result, electrodes functionalized with oriented COF films exhibit a 400% increase in capacitance scaled to electrode area as compared to those functionalized with the randomly oriented COF powder. These results demonstrate the promise of redox-active COFs for electrical energy storage and highlight the importance of controlling morphology for optimal performance.

KEYWORDS:

covalent organic framework; electrochemistry; energy storage; nanoporous materials; polymer films; supercapacitors; surface science

PMID:
25672785
DOI:
10.1021/acsnano.5b00184

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