A redox-active 2D covalent organic framework with pyridine moieties capable of faradaic energy storage

Abstract

A redox active pyridine based covalent organic framework was synthesized and used as an electrode in faradaic supercapacitors. The pyridine units in the DAP-COF undergo a reversible redox reaction, leading to an increase in specific capacitance relative to both its electroactive monomer and a COF lacking redox-active groups.

Design Principles for Covalent Organic Frameworks in Energy Storage Applications

“…[83] For pseudocapacitors, the electrode material must also be able to utilize rapid, reversible chemicalr eactions, notably,o xidation/reduction reactions. [84] Thus, COFs offer design potential and flexibility, such that capacitive energy-storage processes can be studied and optimized. [81,82] COFs offer many advantages over typicalm aterials fore lectrochemical capacitore lectrodes.…”

“…[2d] In another report by DeBlasee tal., [2e] improvements in the capacitive properties of this COF were obtained by synthesizing oriented thin films on ag old electrode, which yielded much higher accessibility of the anthraquinone groups (80-99 %) and as pecific capacitance of 3mFcm À2 ,w hichw as a4 00 %i mprovement compared with the randomly oriented powder. [84] This COF demonstrated as pecific capacitance of 209 Fg À1 and had high (92 %) cycle stability after 6000 charge-discharge cycles. [2g] Khattak et al produced ar edox-activep yridine-based COF by condensing diaminopyridine (DAP) with TFP.…”

Glycination: A Simple Strategy to Enhance the Cycling Performance of Perylene Dianhydride for Secondary Li–Ion Battery Applications

“…Although, simple carbonyl compounds surpassed the conventional inorganic counterparts in terms of specific capacity, their rapid capacity fading due to dissolution hampers their utilization as electrode materials . [4] Of late, many strategies such as molecular and electrode engineering have been reported to impede the dissolution as well as to enhance the electronic conductivity of carbonyl compounds ,,,. For instance, polymerization of simple quinones and anhydrides has been proven to be an efficient method to overcome above said bottlenecks, thereby, achieving stable cycling performance ,.…”

Covalent Organic Frameworks: A New Class of Porous Organic Frameworks for Supercapacitor Electrodes

“…Tang groups reported the application of TaPa‐Py COF with pyridine moiety as the electrode material in pseudocapacitors . This COF was synthesized by the condensation of diaminopyridine (DAP) and triformylphloroglucinol (TFP) under solvothermal condition.…”

“…Tang groups reported the application of TaPa-Py COF with pyridine moiety as the electrode material in pseudocapacitors. [91] This COF was synthesized by the condensation of diaminopyridine (DAP) and triformylphloroglucinol (TFP) under solvothermal condition. In order to illustrate the effect of pyridine unit in pseudocapacitive behavior, DAB-TFP COF was also prepared for comparison which lack pyridine units in backbones (Figure 17).…”