Highly Efficient Photocatalytic CO<SUB>2</SUB> Reduction of Ternary Hybrid System (Ir(III)/TiO<SUB>2</SUB>/ReP) through Electronic Structure Control of Cationic Ir-Complexes
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초록
내용
Herein, we report a detailed investigation of efficient hybrid photocatalysts system for carbon dioxide reduction. The system is based on a co-assembly of Ir(III) photosensitizer and molecular Re(I) reduction catalyst on TiO2 semiconductor. The hybrid system consists of cationic iridium(III) complexes [Ir(C^N)2(N^N)]+ (dfppyIrP, C^N = 2-(2,4-difluorophenyl)pyridine (dfppy); ppyIrP, 2-phenylpyridine (ppy); btpIrP, 2-(benzo[b]thiophen-2-yl)pyridine (btp); piqIrP, 1-phenylisoquinoline (piq); N^N = 4,4′-X2-bipyridine (X = CH2PO(OH)2)) as a visible-light photosensitizer and fac-[Re(4,4′-bis(methylphosphonic acid)-2,2′-bipyridine)(CO)3Cl] as a CO2 reduction catalyst (ReP), both of which have been fixed onto TiO2 semiconductors. Overall the present Ir(III) complex-based hybrid series showed the most durable, efficient catalytic activities compared to typical homogeneous and our previous binary system.