Recent progress of cocatalysts loaded on carbon nitride for selective photoreduction of CO₂to CH₄

Abstract

Photocatalytic system driven by solar light is one of the promising strategies for converting CO2 into valuable energy. The reduction of CO2 to CH4 has been widely studied since CH4...

Metal–organic frameworks (MOFs) for photoelectrocatalytic (PEC) reducing carbon dioxide (CO2) to hydrocarbon fuels

“…Cocatalysts are essential to the PEC reduction of CO 2 . 159 A well-designed cocatalyst has multiple benefits, such as improving the selectivity of CO 2 PEC reduction, promoting catalyst charge separation efficiency, enhancing the adsorption and activation capacity of CO 2 , and inhibiting the occurrence of adverse reactions such as competitive reactions or photocorrosion. For the moment, cocatalyst systems containing MOFs for CO 2 reduction can be classified according to Fig.…”

Recent Progress and Perspectives of S-Scheme Heterojunction Photocatalysts for Photocatalytic CO2 Reduction

“…The repurposing of human-emitted CO 2 through green chemistry not only can control the atmospheric CO 2 concentration and mitigate the greenhouse effect but also can obtain valuable chemical raw materials and reduce the dependence of chemical production on fossil energy, which is considered as an effective way to achieve sustainable development. The process of semiconductor photocatalysis has four main steps: 62,63 (1) the process of adsorbing reactants onto the surface of a catalyst;…”

“…The repurposing of human-emitted CO 2 through green chemistry not only can control the atmospheric CO 2 concentration and mitigate the greenhouse effect but also can obtain valuable chemical raw materials and reduce the dependence of chemical production on fossil energy, which is considered as an effective way to achieve sustainable development. The process of semiconductor photocatalysis has four main steps: , (1) the process of adsorbing reactants onto the surface of a catalyst; (2) excitation of the semiconductor by light, producing electron–hole pairs; (3) the process of electron–hole pair separation and migration toward the catalyst surface; and (4) redox reaction occurs. Among them, carrier separation is the most critical step in photocatalysis, and the composition of heterojunction can substantially improve the efficiency of carrier separation.…”

Bi3O4Cl/g-C3N4/Cd0.5Zn0.5S Double Z-Scheme Heterojunction Photocatalyst for Highly Selective CO2 Reduction to Methane

“…2 However, these precious metal particles can also function as the active center of the hydrogen evolution reaction, which consumes the e − and H + used for CH 4 generation. 6 Meanwhile, their high cost and scarcity seriously limit the large-scale utilization of precious metals. Constructing a heterojunction with other semiconductors is perceived as one of the most efficient methods to improve the CRR activity of CN because it is advantageous for efficient spatial separation of electrons/holes and thus retards their recombination.…”

“…Loading noble metal particles (nanoparticles, single atoms, alloys) on CN is a widely used approach to regulate the CH 4 selectivity since these particles with high work function can act as electron capture and enhance the adsorption of key intermediates in the CO 2 reduction reaction (CRR) . However, these precious metal particles can also function as the active center of the hydrogen evolution reaction, which consumes the e – and H + used for CH 4 generation . Meanwhile, their high cost and scarcity seriously limit the large-scale utilization of precious metals.…”