Details

Autor(en) / Beteiligte

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

Titel

Rapid and Efficient Redox Processes within 2D Covalent Organic Framework Thin Films

Ist Teil von

• ACS nano, 2015-03, Vol.9 (3), p.3178-3183

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.