Visible Light-Driven CO₂ Photocatalytic Reduction by Co-porphyrin-Coupled MgAl Layered Double-Hydroxide Composite

Abstract

CO2 photocatalytic reduction into fuels has provided a sustainable strategy for the mitigation of energy crisis and environmental problems. MgAl layered double hydroxide (LDH), with the advantages of low cost and wide employment in commercial applications, has been regarded as a promising catalyst for CO2 photocatalytic conversion. In order to improve the visible light absorption and charge separation efficiency of MgAl LDH, metalloporphyrin (Co-TCPP) was used for the surface modification of MgAl LDH to prepare the noble metal-free nanocomposite (Co-TCPP@LDH). The synthesized catalyst exhibits increased photocatalytic activity under visible light irradiation compared with pure MgAl LDH. Experimental results show that 20% Co-TCPP@LDH exhibits the highest photocatalytic activity with the CO evolution rate of 0.40 μmol gcat –1, which is about 4.1 times and 3.3 times higher than those of MgAl LDH and Co-TCPP. The excellent visible light absorption of porphyrin molecules can effectively widen the light absorption edge of the heterogeneous photocatalyst to the low energy region (600–800 nm). The intramolecular heterogeneous interface and the highly dispersed cobalt metal sites can facilitate charge transport and separation.

A Biomass‐Ligand‐Based Ru(III) Complex as a Catalyst for Cycloaddition of CO2 and Epoxides to Cyclic Carbonates and a Study of the Mechanism

“…Therefore, excessive CO 2 emissions and unsustainable energy consumption have attracted widespread attention from governments and scientific communities around the world. [7][8] However, as a widely distributed and abundant carbon resource on the earth, CO 2 was also an important C1 synthon to participate in the cycle of "carbon dioxide-organic carboncarbonate". [9][10][11] Therefore, from the perspective of resource utilization and environmental protection, it was quiet mean-ingful to investigate and develop the technology in CO 2 immobilization and chemical conversion.…”

SrTiO3@NiFe LDH core–shell composites for photocatalytic CO2 conversion

“…[20][21][22][23][24] The photocatalysis efficiency were roughly compared by CO yield. STONF 2 showed higher photocatalytic performance than reported CoAl LDH, MgAl LDH, ZnCr LDH, NiAl LDH, NiFe LDH, SrTiO 3 based photocatalysts, [25][26][27][28][29][30][31][32][33][34][35][36][37][38] as summarized in Table S1. †…”

Recent Research Progress and Perspectives on Porphyrin-Based Porous Photocatalysts in the Field of CO2 Reduction

“…Photocatalytic CO 2 reduction of MAPbI 3 @PCN-221­(Fe 0.2 ) to CH 4 (66%) and CO (34%) using water as an electron source had a record high of 325 μmol g –1 CH 4 yield and 104 μmol g –1 CO yield within 25 h, 38 times higher than that of PCN-221­(Fe 0.2 ) without perovskite QDs (Figure ). To enhance CO 2 photocatalytic conversion of metal porphyrin (Co-TCPP), the layered double hydroxide (LDH) was chosen to prepare a noble metal-free nanocomposite (Co-TCPP@LDH) through an organic reaction under 40 °C for 24 h. A 20% Co-TCPP@LDH exhibited the highest photocatalytic activity, with the CO evolution rate of 0.40 μmol g cat –1 , which was about 4.1 and 3.3 times higher than that of LDH and Co-TCPP . The excellent visible light absorption of porphyrin molecules could effectively expand the light absorption edge of the heterogeneous photocatalyst to a low energy region (600–800 nm).…”

“…44 To enhance CO 2 photocatalytic conversion of metal porphyrin (Co-TCPP), the layered double hydroxide (LDH) was chosen to prepare a noble metal-free nanocomposite (Co-TCPP@LDH) through an organic reaction under 40 °C for 24 h. A 20% Co-TCPP@LDH exhibited the highest photocatalytic activity, with the CO evolution rate of 0.40 μmol g cat −1 , which was about 4.1 and 3.3 times higher than that of LDH and Co-TCPP. 45 The excellent visible light absorption of porphyrin molecules could effectively expand the light absorption edge of the heterogeneous photocatalyst to a low energy region (600−800 nm). Intramolecular heterogeneous interfaces and highly dispersed cobalt metal sites could promote charge transport and separation.…”