Recent progress on covalent organic framework materials as CO2 reduction electrocatalysts

Abstract

CO2 emission caused by fuel combustion and human activity has caused severe climate change and other subsequent pollutions around the world. Carbon neutralization via various novel technologies to alleviate the CO2 level in the atmosphere has thus become one of the major topics in modern research field. These advanced technologies cover CO2 capture, storage and conversion, etc., and electrocatalytic CO2 reduction reaction (CO2RR) by heterogeneous catalysts is among the most promising methods since it could utilize renewable energy and generate valuable fuels and chemicals. Covalent organic frameworks (COFs) represent crystalline organic polymers with highly rigid, conjugated structures and tunable porosity, which exhibit significant potential as heterogeneous electrocatalysts for CO2RR. This review briefly introduces related pioneering works in COF-based materials for electrocatalytic CO2RR in recent years and provides a basis for future design and synthesis of highly active and selective COF-based electrocatalysts in this direction.

Redox-Active Organic Materials: From Energy Storage to Redox Catalysis

“…In contrast to the wide study of organic materials in the areas of photoredox catalysis (section ) and energy storage (section ), organoelectrochemistry using polymer-based redox mediators or electrocatalysts remains significantly understudied. Nonetheless, POPs and COFs have emerged as promising catalysts for environmentally relevant electrocatalytic transformations such as the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and CO 2 reduction. ,− The benefits of these materials over homogeneous electrocatalysis include colocalization of active sites, stabilization of reactive species, and recyclability. In this section, we further elaborate the advantages of POPs and COFs as heterogeneous mediators for electrocatalysis, with the goal of highlighting their potential future utility for electrosynthesis.…”

Covalent organic frameworks in heterogeneous catalysis: recent advances and future perspective

“…As of now, most COF-based electrocatalysts produce CO as the primary product via a two-electron transfer pathway, with few deeply reduced multi-carbon (C 2+ ) products observed. 204…”

“…As of now, most COF-based electrocatalysts produce CO as the primary product via a two-electron transfer pathway, with few deeply reduced multi-carbon (C 2+ ) products observed. 204 Metalated COFs. COFs containing metalated secondary structural units such as metalloporphyrins and metallophthalocyanine have demonstrated significant in heterogeneous CO 2 electroreduction.…”

Covalent–Organic Framework (COF)‐Core–Shell Composites: Classification, Synthesis, Properties, and Applications

“…[ 21,22 ] While the poor conductivity of the COFs can be overcome by hybridization with other conductive materials or the introduction of transition metal active sites. [ 23 ] Among these strategies, the cooperation of COFs with other specialty components to form core–shell structures has attracted the interest of researchers (Figure 1b,c) as it demonstrates a synergistic effect by integrating the preeminent physicochemical properties of multiple components to demonstrate enhanced performance.…”