Strategies for the development of visible-light-driven photocatalysts for water splitting

Akihiko Kudo, Hideki Kato, Issei Tsuji

Research output: Contribution to journalReview articlepeer-review

399 Citations (Scopus)


Photocatalysts for water splitting developed by the present authors are reviewed. A NiO (0.2 wt%)/NaTaO 3:La (2%) photocatalyst with a 4.1-eV band gap showed high activity for water splitting into H 2 and O 2 with an apparent quantum yield of 56% at 270 nm. Many visible-light-driven photocatalysts have also been developed through band engineering by doping of metal cations, forming new valence bands with Bi 6S, Sn 5S, and Ag 4d orbitals, and by making solid solutions between ZnS with wide band gap and narrow band gap semiconductors. Overall water splitting under visible light irradiation has been achieved by construction of a Z-scheme photocatalysis system employing the visible-light-driven photocatalysts for H 2 and O 2 evolution, and the Fe 3+/Fe 2+ redox couple as an electron relay.

Original languageEnglish
Pages (from-to)1534-1539
Number of pages6
JournalChemistry Letters
Issue number12
Publication statusPublished - 2004 Dec 5


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