Organometallic Iridium(III) Complex Sensitized Ternary Hybrid Photocatalyst for CO2 to CO Conversion
- Authors
- Kim, Pil Soo; Choi, Sunghan; Kim, So-Yoen; Jo, Ju Hyoung; Lee, Yoon Seo; Kim, Bupmo; Kim, Wooyul; Choi, Wonyong; Kim, Chul Hoon; Son, Ho-Jin; Pac, Chyongjin; Kang, Sang Ook
- Issue Date
- 22-10월-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- heterogeneous catalysis; iridium; photochemistry; sensitizers; supported catalysts
- Citation
- CHEMISTRY-A EUROPEAN JOURNAL, v.25, no.59, pp.13609 - 13623
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY-A EUROPEAN JOURNAL
- Volume
- 25
- Number
- 59
- Start Page
- 13609
- End Page
- 13623
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/62175
- DOI
- 10.1002/chem.201903136
- ISSN
- 0947-6539
- Abstract
- A series of heteroleptic iridium(III) complexes functionalized with two phosphonic acid (-PO3H2) groups ((IrP)-Ir-dfppy, (IrP)-Ir-ppy, (IrP)-Ir-btp, and (IrP)-Ir-piq) were prepared and anchored onto rhenium(I) catalyst (ReP)-loaded TiO2 particles (TiO2/ReP) to build up a new IrP-sensitized TiO2 photocatalyst system (IrP/TiO2/ReP). The photosensitizing behavior of the IrP series was examined within the IrP/TiO2/ReP platform for the photocatalytic conversion of CO2 into CO. The four IrP-based ternary hybrids showed increased conversion activity and durability than that of the corresponding homo- (IrP+ReP) and heterogeneous (IrP+TiO2/ReP) mixed systems. Among the four IrP/TiO2/ReP photocatalysts, the low-energy-light (>500 nm) activated (IrP)-Ir-piq immobilized ternary system ((IrP)-Ir-piq/TiO2/ReP) exhibited the most durable conversion activity, giving a turnover number of >= 730 for 170 h. A similar kinetic feature observed through time-resolved photoluminescence measurements of both (IrP)-Ir-btp/TiO2 and TiO2-free (IrP)-Ir-btp films suggests that the net electron flow in the ternary hybrid proceeds dominantly through a reductive quenching mechanism, unlike the oxidative quenching route of typical dye/TiO2-based photolysis.
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Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
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