Metal-complex/semiconductor hybrids for carbon dioxide fixation

Kazuhiko Maeda; Ryo Kuriki; Keita Sekizawa; Osamu Ishitani

doi:10.1117/12.2187341

5 September 2015 Metal-complex/semiconductor hybrids for carbon dioxide fixation

Kazuhiko Maeda, Ryo Kuriki, Keita Sekizawa, Osamu Ishitani

Proceedings Volume 9560, Solar Hydrogen and Nanotechnology X; 956006 (2015) https://doi.org/10.1117/12.2187341
Event: SPIE Optics + Photonics for Sustainable Energy, 2015, San Diego, California, United States

Abstract

A hybrid photocatalyst consisting of a catalytic Ru complex and polymeric carbon nitride (band gap, 2.7 eV) was capable of reducing CO₂ into HCOOH with ~80% selectivity under visible light (λ > 420 nm) in the presence of a suitable electron donor. Introduction of mesoporosity into the graphitic carbon nitride structure to increase the specific surface area was essential to enhancing the activity. However, higher surface area (in other words, lower crystallinity) that originated from excessively introduced mesopores had a negative impact on activity. Promoting electron injection from carbon nitride to the catalytic Ru unit as well as strengthening the electronic interactions between the two units improved the activity. Under the optimal condition, a turnover number (TON, with respect to the Ru complex used) greater than 1000 and an apparent quantum yield of 5.7% (at 400 nm) were obtained, which are the greatest among heterogeneous photocatalysts for visible-light CO₂ reduction ever reported.

Citation Download Citation

Kazuhiko Maeda, Ryo Kuriki, Keita Sekizawa, and Osamu Ishitani "Metal-complex/semiconductor hybrids for carbon dioxide fixation", Proc. SPIE 9560, Solar Hydrogen and Nanotechnology X, 956006 (5 September 2015); https://doi.org/10.1117/12.2187341

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