Year: 2015
Type: article
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.
Source: ACS Nano
Institution: Cornell University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, Alfred P. Sloan Foundation, Camille and Henry Dreyfus Foundation, New York State Foundation for Science, Technology and Innovation, National Institutes of Health, Cornell Center for Materials Research, Division of Physics, National Institute of General Medical Sciences, Division of Materials Research, Division of Graduate Education, Basic Energy Sciences
Awards: G1370997120, G1690895400, G1977972760, IGERT: A Graduate Traineeship in Materials for a Sustainable Future, G222768804, G2579886042, SYNTHESIS AND PROPERTIES OF NOVEL CLUSTER PHASES, G3765158766, G4032296663, G4036252038, SYNTHESIS, CHARACTERIZATION AND PROPERTIES OF NANOPARTICLES OF INTERMETALLIC COMPOUNDS, G440393388, G4656289215, G522049510, Cornell Center for Materials Research - CEMRI, OPERATION OF CORNELL HIGH ENERGY SYNCHROTRON SOURCE (CHESS), G556838877, G5648016710, G6429492609, Graduate Reserach Fellowship Program (GRFP), G7560757414, G7561642361, G8549148173, TAS::89 0227::TAS RECOVERY; RECOVERY ACT - NANOSTRUCTURED INTERFACES FOR ENERGY GENERATION, CONVERSION, AND STORAGE -- EFRC; PI - HECTOR ABRUNA
OpenAlex ID: W2327311573