CsPbBr₃/Polyoxometalate Composites for Selective Photocatalytic Oxidation of Benzyl Alcohol

Abstract

Selective oxidation of benzyl alcohols to the corresponding carbonyl compounds is of great importance for providing versatile intermediates for the synthesis of pharmaceuticals and fine chemicals. In this work, we constructed a CsPbBr3/[Ni4(H2O)2(PW9O34)2]10– (CsPbBr3/Ni 4 P 2 ) composite by integrating the visible light-responsive ability of CsPbBr3 and the multielectron-transfer ability of polyoxometalates. The resulting CsPbBr3/Ni 4 P 2 composite exhibited good photocatalytic activity toward the selective conversion of benzyl alcohol to benzaldehyde with ∼100% selectivity. Mechanistic studies revealed that the tetra-nickel-substituted polyoxotungstate, Ni 4 P 2 , played crucial roles in the separation/migration and utilization of photogenerated charge carries due to its well-matched energy level with that of CsPbBr3 and the distinctive electron/proton-transferring ability as a redox shuttle. Multiple scavenging experiments confirmed that the photogenerated electrons (e–), holes (h+), •O2 –, and 1O2 were key reactive species for efficient photocatalysis.

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“…, ˙O 2 − and 1 O 2 ) are helpful to promote alcohol oxidation rates. 14,15 However, this aerobic strategy suffers from drawbacks in practical applications due to the wastage of photogenerated electrons. Furthermore, green hydrogen production from renewable energy has emerged as a sustainable process for a low-carbon future.…”

Highly efficient photoelectrocatalytic oxidation of arsenic(iii) with a polyoxometalate-thiacalix[4]arene-based metal–organic complex-modified bismuth vanadate photoanode

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