Photocatalytic splitting of water into hydrogen and oxygen on organic dye modified KTa(Zr)O3 catalyst

Hidehisa Hagiwara, Masakiyo Nagatomo, Shintaro Ida, Tatsumi Ishihara

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    10 Citations (Scopus)

    Abstract

    Photocatalytic activity of KTaO3 catalyst to water splitting is much improved by organic dye-modification. In particular, cyanocobalamin (Vitamin B12) is the most effective for improving water splitting activity, and the formation rate of H2 and O2 are achieved values of 1912 and 979 μmol gcat-1h-1, respectively, under the light irradiation from Xe lamp (300W). Mechanism of photocatalytic H2O splitting into H2 and O2 on PtOX/KTa(Zr)O3 modified with various dyes were investigated. Photoluminescence (PL) spectra of KTaO3 catalysts suggested that the excitation energy transfers from KTaO3 to Cr- Tetraphenylporphyrin (Cr-TPP) and PtOX co-catalyst. Transient response of photovoltaic potential revealed that the excitation state of KTaO3 was enlarged over 500 jis by dye-modification. Photo-excited electron in KTaO3 transfers to dye, and a long charge separation state was achieved. Thus, it was suggested that the photocatalytic activity was much improved by increasing lifetime of photo-excited charges which can reach to the reaction site effectively.

    Original languageEnglish
    Title of host publicationEMRS Symposium T
    Subtitle of host publicationMaterials for Solar Hydrogen via Photo-Electrochemical Production
    PublisherElsevier Ltd
    Pages53-60
    Number of pages8
    ISBN (Print)9781627484312
    DOIs
    Publication statusPublished - Jan 1 2012
    EventEMRS Symposium T: Materials for Solar Hydrogen via Photo-Electrochemical Production 2011 - Nice, France
    Duration: May 9 2011May 13 2011

    Publication series

    NameEnergy Procedia
    Volume22
    ISSN (Print)1876-6102

    Other

    OtherEMRS Symposium T: Materials for Solar Hydrogen via Photo-Electrochemical Production 2011
    Country/TerritoryFrance
    CityNice
    Period5/9/115/13/11

    All Science Journal Classification (ASJC) codes

    • Energy(all)

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