Incorporation of Polyoxometalate in Sulfonic Acid-modified MIL-101-Cr for Enhanced CO₂ Photoreduction Activity

Silicomolybdic acid is supported on the sulfonic acid-modified MIL-101-Cr by diffusion method, which increases the metal active sites on the surface of the material while maintains the structural integrity of MIL-101. The CO yield of composite SiMo12O40@SO3H-MIL-101-Cr in CO2 photoreduction is as high as 82.95 mu mol/(g . h), and the CO selectivity is 93.2 %. The improvement in the catalytic performance of the composite can be attributed to the synergistic effect of the sulfonic acid group and the silicomolybdic acid molecule, which could effectively promote the separation of photogenerated carriers and inhibit the recombination of photogenerated electrons and hole pairs.