Photocatalytic activities of Cu3xLa1-xTa 7O19 solid solutions for H2 evolution under visible light irradiation

Hideki Kato, Arisa Takeda, Makoto Kobayashi, Michikazu Hara, Masato Kakihana

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Development of new visible-light-driven oxide photocatalysts for H 2 evolution was conducted with a concept of formation of solid solutions containing Cu(i) ions. Band gaps of Cu3xLa 1-xTa7O19 solid solutions were 2.57-2.71 eV being remarkably narrower than that of LaTa7O19 (x = 0, 4.14 eV). The remarkable narrowing of the band gaps was due to the contribution of Cu 3d orbitals to valence bands. The solid solutions were capable of photocatalytic H2 evolution under visible light irradiation in the presence of methanol as an electron donor. Interestingly, the solid solutions with x = 0.2-0.8 showed higher activities than that of a native Cu(i)-tantalate, Cu3Ta7O19 (x = 0). Among the solid solutions, the x = 0.6 sample, Cu1.8La0.4Ta7O 19, exhibited the highest activity. The apparent quantum yield of the optimized photocatalyst was 0.48% at 420 nm. Moreover, the good stability of Cu(i) ions in the solid solutions was proven through the investigation of photocatalytic properties and the XPS analysis. Thus, new visible-light-driven oxide photocatalysts capable of H2 evolution were developed by the formation of the Cu3xLa1-xTa7O19 solid solutions.

    Original languageEnglish
    Pages (from-to)3147-3154
    Number of pages8
    JournalCatalysis Science and Technology
    Volume3
    Issue number12
    DOIs
    Publication statusPublished - 2013 Dec

    ASJC Scopus subject areas

    • Catalysis

    Fingerprint

    Dive into the research topics of 'Photocatalytic activities of Cu3xLa1-xTa 7O19 solid solutions for H2 evolution under visible light irradiation'. Together they form a unique fingerprint.

    Cite this