Photocatalytic Reduction of Low Concentration of CO2

Takuya Nakajima; Yusuke Tamaki; Kazuki Ueno; Eishiro Kato; Tetsuya Nishikawa; Kei Ohkubo; Yasuomi Yamazaki; Tatsuki Morimoto; Osamu Ishitani

doi:10.1021/jacs.6b08824

Photocatalytic Reduction of Low Concentration of CO₂

J Am Chem Soc. 2016 Oct 26;138(42):13818-13821. doi: 10.1021/jacs.6b08824. Epub 2016 Oct 11.

Authors

Takuya Nakajima¹, Yusuke Tamaki¹, Kazuki Ueno¹, Eishiro Kato¹, Tetsuya Nishikawa¹, Kei Ohkubo¹, Yasuomi Yamazaki¹, Tatsuki Morimoto^{2

3}, Osamu Ishitani¹

Affiliations

¹ Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1, NE-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan.
² Department of Applied Chemistry, School of Engineering, Tokyo University of Technology , 1404-1, Katakura, Hachioji, Tokyo 192-0982, Japan.
³ PRESTO, Japan Science and Technology Agency (JST) , 4-1-8 Honcho, Kawaguchi-shi, Saitama 332-0012, Japan.

PMID: 27704819
DOI: 10.1021/jacs.6b08824

Abstract

A novel molecular photocatalytic system with not only high reduction ability of CO₂ but also high capture ability of CO₂ has been developed using a Ru(II)-Re(I) dinuclear complex as a photocatalyst. By using this photocatalytic system, CO₂ of 10% concentration could be selectively converted to CO with almost same photocatalysis to that under a pure CO₂ atmosphere (TON_CO > 1000, Φ_CO > 0.4). Even 0.5% concentration of CO₂ was reduced with 60% initial efficiency of CO formation by using the same system compared to that using pure CO₂ (TON_CO > 200). The Re(I) catalyst unit in the photocatalyst can efficiently capture CO₂, which proceeds CO₂ insertion to the Re-O bond, and then reduce the captured CO₂ by using an electron supplied from the photochemically reduced Ru photosensitizer unit.