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Shimamura T, Yoshimura N, Otsuka H, Yoshida M, Kobayashi A. Efficient water reduction by ruthenium-picolinate dye-sensitized photocatalyst under red light illumination. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Kuttassery F, Kumagai H, Kamata R, Ebato Y, Higashi M, Suzuki H, Abe R, Ishitani O. Supramolecular photocatalysts fixed on the inside of the polypyrrole layer in dye sensitized molecular photocathodes: application to photocatalytic CO 2 reduction coupled with water oxidation. Chem Sci 2021; 12:13216-13232. [PMID: 34745553 PMCID: PMC8513877 DOI: 10.1039/d1sc03756k] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Accepted: 09/10/2021] [Indexed: 01/24/2023] Open
Abstract
The development of systems for photocatalytic CO2 reduction with water as a reductant and solar light as an energy source is one of the most important milestones on the way to artificial photosynthesis. Although such reduction can be performed using dye-sensitized molecular photocathodes comprising metal complexes as redox photosensitizers and catalyst units fixed on a p-type semiconductor electrode, the performance of the corresponding photoelectrochemical cells remains low, e.g., their highest incident photon-to-current conversion efficiency (IPCE) equals 1.2%. Herein, we report a novel dye-sensitized molecular photocathode for photocatalytic CO2 reduction in water featuring a polypyrrole layer, [Ru(diimine)3]2+ as a redox photosensitizer unit, and Ru(diimine)(CO)2Cl2 as the catalyst unit and reveal that the incorporation of the polypyrrole network significantly improves reactivity and durability relative to those of previously reported dye-sensitized molecular photocathodes. The irradiation of the novel photocathode with visible light under low applied bias stably induces the photocatalytic reduction of CO2 to CO and HCOOH with high faradaic efficiency and selectivity (even in aqueous solution), and the highest IPCE is determined as 4.7%. The novel photocathode is coupled with n-type semiconductor photoanodes (CoO x /BiVO4 and RhO x /TaON) to construct full cells that photocatalytically reduce CO2 using water as the reductant upon visible light irradiation as the only energy input at zero bias. The artificial Z-scheme photoelectrochemical cell with the dye-sensitized molecular photocathode achieves the highest energy conversion efficiency of 8.3 × 10-2% under the irradiation of both electrodes with visible light, while a solar to chemical conversion efficiency of 4.2 × 10-2% is achieved for a tandem-type cell using a solar light simulator (AM 1.5, 100 mW cm-2).
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Affiliation(s)
- Fazalurahman Kuttassery
- Department of Chemistry, Tokyo Institute of Technology 2-12-1-NE-1, O-okayama Meguro-ku Tokyo 152-8550 Japan
| | - Hiromu Kumagai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University 2-1-1, Katahira, Aoba-ku Sendai Miyagi 980-8577 Japan
| | - Ryutaro Kamata
- Department of Chemistry, Tokyo Institute of Technology 2-12-1-NE-1, O-okayama Meguro-ku Tokyo 152-8550 Japan
| | - Yusuke Ebato
- Department of Chemistry, Tokyo Institute of Technology 2-12-1-NE-1, O-okayama Meguro-ku Tokyo 152-8550 Japan
| | - Masanobu Higashi
- The OCU Advanced Research Institute for Natural Science and Technology, Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka City Osaka 558-8585 Japan
| | - Hajime Suzuki
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku Kyoto 615-8510 Japan
| | - Ryu Abe
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku Kyoto 615-8510 Japan
| | - Osamu Ishitani
- Department of Chemistry, Tokyo Institute of Technology 2-12-1-NE-1, O-okayama Meguro-ku Tokyo 152-8550 Japan
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Chettri A, Roque JA, Schneider KRA, Cole HD, Cameron CG, McFarland SA, Dietzek B. It Takes Three to Tango - the length of the oligothiophene determines the nature of the long-lived excited state and the resulting photocytotoxicity of a Ru(II) photodrug. CHEMPHOTOCHEM 2021; 5:421-425. [PMID: 34337147 PMCID: PMC8323708 DOI: 10.1002/cptc.202000283] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Indexed: 02/06/2023]
Abstract
TLD1433 is the first Ru(II) complex to be tested as a photodynamic therapy agent in a clinical trial. In this contribution we study TLD1433 in the context of structurally-related Ru(II)-imidozo[4,5-f][1,10]phenanthroline (ip) complexes appended with thiophene rings to decipher the unique photophysical properties which are associated with increasing oligothiophene chain length. Substitution of the ip ligand with ter- or quaterthiophene changes the nature of the long-lived triplet state from metal-to-ligand charge-transfer to 3ππ* character. The addition of the third thiophene thus presents a critical juncture which not only determines the photophysics of the complex but most importantly its capacity for 1O2 generation and hence the potential of the complex to be used as a photocytotoxic agent. ENTRY FOR THE TABLE OF CONTENTS A low-lying triplet intraligand state (3IL) determines the properties of the long-lived excited states in a series of Ru(II) complexes. The 3IL state can be accessed by increasing the length of an oligothiophene chain. The 3IL state is extremely efficient at generating 1O2 and thus enhances the potency of the complexes as PDT agents.
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Affiliation(s)
- Avinash Chettri
- Department Functional Interfaces Department, Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Straße 9, 07745 Jena, Germany
- Institute of Physical Chemistry, Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - John A. Roque
- Department of Chemistry and Biochemistry, The University of Texas Arlington, Arlington, TX 76019, USA
- Department of Chemistry and Biochemistry, The University of North Carolina at Greensboro, Greensboro, North Carolina 27402, USA
| | - Kilian R. A. Schneider
- Department Functional Interfaces Department, Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Straße 9, 07745 Jena, Germany
- Institute of Physical Chemistry, Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Houston D. Cole
- Department of Chemistry and Biochemistry, The University of Texas Arlington, Arlington, TX 76019, USA
| | - Colin G. Cameron
- Department of Chemistry and Biochemistry, The University of Texas Arlington, Arlington, TX 76019, USA
| | - Sherri A. McFarland
- Department of Chemistry and Biochemistry, The University of Texas Arlington, Arlington, TX 76019, USA
| | - Benjamin Dietzek
- Department Functional Interfaces Department, Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Straße 9, 07745 Jena, Germany
- Institute of Physical Chemistry, Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
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