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Proceedings Paper

A two-step photoexcitation system for photocatalytic water splitting into hydrogen and oxygen under visible light irradiation
Author(s): Ryu Abe
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Paper Abstract

The developments of water-splitting systems that can efficiently use visible light have been a major challenge for many years in order to realize efficient conversion of solar light. We have developed a new type of photocatalysis system that can split water into H2 and O2 under visible light irradiation, which was inspired by the two-step photoexcitation (Zscheme) mechanism of natural photosynthesis in green plants. In this system, the water splitting reaction is broken up into two stages: one for H2 evolution and the other for O2 evolution; these are combined by using a shuttle redox couple (Red/Ox) in the solution. The introduction of a Z-scheme mechanism reduces the energy required to drive each photocatalysis process, extending the usable wavelengths significantly (~460 nm for H2 evolution and ~600 nm for O2evolution) from that in conventional water splitting systems (~460 nm) based on one-step photoexcitation in single semiconductor material.

Paper Details

Date Published: 19 September 2011
PDF: 13 pages
Proc. SPIE 8109, Solar Hydrogen and Nanotechnology VI, 81090B (19 September 2011); doi: 10.1117/12.893146
Show Author Affiliations
Ryu Abe, Hokkaido Univ. (Japan)

Published in SPIE Proceedings Vol. 8109:
Solar Hydrogen and Nanotechnology VI
Yasuhiro Tachibana, Editor(s)

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