Covalent organic frameworks (COFs) for electrochemical applications

Abstract

This review article summarizes the design principles and strategies for the synthesis of functional COFs, with a special focus on their potential for electrochemical applications.

Organic frameworks confined Cu single atoms and nanoclusters for tandem electrocatalytic CO2 reduction to methane

“…Meanwhile, a strong hydrogen evolution reaction (HER) occurs as an unavoidable competitive reaction 24 . Due to the substantial excess of H 2 O and much lower overpotential, the reduction to hydrogen by‐product is usually more facile to happen 14 . Thus, improving the selectivity of CH 4 through the activation of H 2 O while suppressing the HER is exceptionally challenging in the production of CH 4 .…”

“…Recently, the cofacial packed two-dimensional (2D) covalent organic frameworks (COFs) have attracted considerable attention in the electrochemical energy storage and conversion system, due to the efficient electron transfer by the conjugated molecular building blocks linked via the in-plane covalent bonds and interlayer π-π interactions. 14 The rich porosity in the COF network can be utilized to confine the growth of Cu aggregates, the dimension of which can be tuned by selecting COFs with tunable nanoscale pore sizes. In addition, the pores of the COF network with N-containing functional groups have been proven to be beneficial for CO 2 capture and fixation, 15 which may promote the CO 2 RR.…”

A facile and scalable synthetic method for covalent organic nanosheets: ultrasonic polycondensation and photocatalytic degradation of organic pollutants

“…Covalent organic frameworks (COFs), 1,2 as a burgeoning class of crystalline organic polymers with permanent porosity, have garnered wide attention over the past decade due to their versatile applications in many fields ranging from catalysis, 3–6 sensing, 7–11 gas storage, 12–16 separation, 17–20 drug delivery, 21–24 nanomedicine, 25,26 to energy storage. 27–31 These applications have been enabled by the unique structural features of COFs such as ordered internal structures, well-defined nanochannels, large specific surface areas and conjugated skeletons, as well as their predesignable, tailorable, and functionalizable skeletons. COFs are usually prepared via solvothermal synthesis, which gives rise to insoluble polycrystalline powders (bulk COFs).…”

Acridine‐Functionalized Covalent Organic Frameworks (COFs) as Photocatalysts for Metallaphotocatalytic C−N Cross‐Coupling

“…A variety of building units (linkers) and organic reactions have been applied for the synthesis of COFs with a broad range of functionalities, linkages and variable pore structures [7–13] . Because these ordered structures have a permanent porosity, long‐range π‐conjugation, and the possibility to tune the structure of the backbone and integrate functional linkers, COFs have emerged as powerful materials for a plethora of different applications including gas storage and separation, energy storage, optoelectronics and catalysis [13–21] . The formation of strong covalent bonds between the organic building blocks results in high chemical stability for the framework materials that can be further enhanced by introducing linkers that allow for e.g.…”