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

Hidehisa Hagiwara; Masakiyo Nagatomo; Shintaro Ida; Tatsumi Ishihara

doi:10.1016/j.egypro.2012.05.224

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 proceeding › Conference contribution

11 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 g_cat^-1h^-1, respectively, under the light irradiation from Xe lamp (300W). Mechanism of photocatalytic H₂O splitting into H₂ and O₂ on PtO_X/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 PtO_X 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 language	English
Title of host publication	EMRS Symposium T
Subtitle of host publication	Materials for Solar Hydrogen via Photo-Electrochemical Production
Publisher	Elsevier Ltd
Pages	53-60
Number of pages	8
ISBN (Print)	9781627484312
DOIs	https://doi.org/10.1016/j.egypro.2012.05.224
Publication status	Published - Jan 1 2012
Event	EMRS Symposium T: Materials for Solar Hydrogen via Photo-Electrochemical Production 2011 - Nice, France Duration: May 9 2011 → May 13 2011

Publication series

Name	Energy Procedia
Volume	22
ISSN (Print)	1876-6102

Other

Other	EMRS Symposium T: Materials for Solar Hydrogen via Photo-Electrochemical Production 2011
Country/Territory	France
City	Nice
Period	5/9/11 → 5/13/11

All Science Journal Classification (ASJC) codes

Energy(all)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.egypro.2012.05.224

Cite this

Photocatalytic splitting of water into hydrogen and oxygen on organic dye modified KTa(Zr)O₃ catalyst. / Hagiwara, Hidehisa; Nagatomo, Masakiyo; Ida, Shintaro et al.
EMRS Symposium T: Materials for Solar Hydrogen via Photo-Electrochemical Production. Elsevier Ltd, 2012. p. 53-60 (Energy Procedia; Vol. 22).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Hagiwara, H, Nagatomo, M, Ida, S & Ishihara, T 2012, Photocatalytic splitting of water into hydrogen and oxygen on organic dye modified KTa(Zr)O₃ catalyst. in EMRS Symposium T: Materials for Solar Hydrogen via Photo-Electrochemical Production. Energy Procedia, vol. 22, Elsevier Ltd, pp. 53-60, EMRS Symposium T: Materials for Solar Hydrogen via Photo-Electrochemical Production 2011, Nice, France, 5/9/11. https://doi.org/10.1016/j.egypro.2012.05.224

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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.",

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