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Phenazine–Based Covalent Organic Framework Cathode Materials with High Energy and Power Densities

submitted on 31.07.2019, 06:07 and posted on 31.07.2019, 15:21 by Edon Vitaku, Cara Gannett, Keith Carpenter, Luxi Shen, Hector Abruna, William Dichtel
Redox-active covalent organic frameworks (COFs) are promising materials for energy storage devices because of their high density of redox sites, permanent and controlled porosity, high surface areas, and tunable structures. However, the low electrochemical accessibility of their redox-active sites has limited COF-based devices either to thin films (<250 nm) grown on conductive substrates, or to thicker films (1 µm) when a conductive polymer is introduced into the COF pores. Electrical energy storage devices constructed from bulk microcrystalline COF powders, eliminating the need for both thin-film formation and conductive polymer guests, would offer both improved capacity and potentially scalable fabrication processes. Here we report on the synthesis and electrochemical evaluation of a new phenazine-based 2D COF (DAPH-TFP COF), as well as its composite with poly(3,4-ethylenedioxythiophene) (PEDOT). Both the COF and its PEDOT composite were evaluated as powders that were solution-cast onto bulk electrodes serving as current collectors. The unmodified DAPH-TFP COF exhibited excellent electrical access to its redox sites, even without PEDOT functionalization, and outperformed the PEDOT composite of a previously reported anthraquinone-based system. Devices containing DAPH-TFP COF were able to deliver both high energy (250 Wh/kg) and power densities (2950 W/kg), validating the promise of unmodified redox-active COFs that are easily incorporated into electrical energy storage devices.


ARO W911NF-15-1-0447

NSF ECCS-1542205

NSF DMR-1120296


Email Address of Submitting Author


Northwestern University



ORCID For Submitting Author


Declaration of Conflict of Interest

The authors declare no competing financial interest