| Autor: |
Catherine R. DeBlase, Katharine E. Silberstein, Kenneth Hernández-Burgos, Gabriel G. Rodríguez-Calero, William R. Dichtel, Héctor D. Abruña, Ryan P. Bisbey |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
ACS nano. 9(3) |
| ISSN: |
1936-086X |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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