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

Catherine R. Deblase, Kenneth Hernández-Burgos, Katharine E. Silberstein, Gabriel G. Rodríguez-Calero, Ryan P. Bisbey, Héctor D. Abruña, William R. Dichtel*

*Corresponding author for this work

Research output: Contribution to journalArticle

178 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)3178-3183
Number of pages6
JournalACS Nano
Volume9
Issue number3
DOIs
StatePublished - Jan 1 2015

Keywords

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

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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