A metal-free covalent organic framework as a photocatalyst for CO₂ reduction at low CO₂ concentration in a gas–solid system

Abstract

A β-ketoenamine-based COF is used as photocatalyst to convert CO2 and H2O into CO and O2 under visible-light irradiation without additional photosensitizers and sacrificial agents in gas-solid system. When CO2...

Covalent organic frameworks

“…It is obvious that the reduction efficiency is much less than that of metallic-supplemented COFs, but metal-free COFs are also of great significance for the development of future carbon dioxide reduction. With these concerns, Liu and co-workers prepared a β-ketoenamine-based 2D COF, termed TpBb-COF (Figure 11), by condensation of 2,6-diaminobenzo[1,2-d:4,5-d′] bisthiazole and 1,3,5-triformylphloroglucinol, exhibited an excellent CO production in gas-solid system without using any photosensitizer and sacrificial agent [89]. Interestingly, the reduction of CO 2 concentration was more beneficial to CO production, and when CO 2 concentration was reduced to 30.0%, the CO generation rate increased to 89.9 μmol g −1 h −1 .…”

From conventional inorganic semiconductors to covalent organic frameworks: advances and opportunities in heterogeneous photocatalytic CO2 reduction

“…121 The effect of other functional groups on the performance of COF-based photocatalysts has been also reported elsewhere. [126][127][128] 3.1.2 Linkage motifs. A compelling approach towards tuning and controlling the electronic interactions and optoelectronic properties within the COF is to vary the linkage motif which connects the monomers.…”

“…121 The effect of other functional groups on the performance of COF-based photocatalysts has been also reported elsewhere. 126–128…”

A Z-scheme heterojunction of porphyrin-based core–shell Zr-MOF@Pro-COF-Br hybrid materials for efficient visible-light-driven CO2 reduction

“…19,20 They possessed high S BET and thermal and chemical stability. 21,22 Cui et al 23 prepared a kind of b-ketoenamine-based TpBb-COF with the photocatalytic yield rate from CO 2 to CO of 16.2 mmol g −1 h −1 at 40 °C and 89.9 mmol g −1 h −1 at 80 °C. However, the COFs have few catalytically active sites, poor light responsiveness, and poor electrical conductivity.…”