Solar hydrogen production by water splitting using TiO2 based photoelectrodes

Hironori Arakawa; Chikara Shiraishi; Akihito Takeuchi; Takeshi Yamaguchi

doi:10.1117/12.679887

8 September 2006 Solar hydrogen production by water splitting using TiO₂ based photoelectrodes

Hironori Arakawa, Chikara Shiraishi, Akihito Takeuchi, Takeshi Yamaguchi

Proceedings Volume 6340, Solar Hydrogen and Nanotechnology; 63400G (2006) https://doi.org/10.1117/12.679887
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

Photoelectrochemical water splitting into H₂ and O₂ was investigated using TiO₂ based photoelectrodes. First, influence of photoelectorde structure on water splitting was studied through photocurrent observation. Solar energy conversion efficiency to H₂ (STH) of mesoporous TiO₂ photoelectode, composed of anatase TiO₂ particles of 20nm in diameter, with 10μ thickness on FTO glass was 0.32% under 0.4V vs RHE, producing 0.39mA/cm². The quantum efficiency of water splitting at 360nm was 27%. Then, visible light absorbing mesoporous N-doped and S-doped anatase TiO₂ photoelectrodes were studied. Visible light absorbing properties of these photoelectrodes were dramatically decreased with increasing calcination temperature to 550°C. However, photocurrent such as 1μA/cm² was observed under 0.94V vs RHE and visible light irradiation using 300W-Xe lamp with 410nm cut off filter. Overall photocurrent of N-doped and S-doped TiO₂ photoelectrode was about 1/5 to 1/10 of that of non-doped TiO₂ photoelectrodes. Finally, solar hydrogen production by a tandem cell, composed of a mesoporous TiO₂ based photoelectrode, a Pt wire electrode and a Black dye-sensitized solar cell, was studied. STH of a non-doped TiO₂ photoelectrode system was 0.53% but STH of a S-doped TiO₂ photoelectrode system was 0.15%, which was 1/3 lower than that of a non-doped TiO₂ photoelectrodes.

Citation Download Citation

Hironori Arakawa, Chikara Shiraishi, Akihito Takeuchi, and Takeshi Yamaguchi "Solar hydrogen production by water splitting using TiO₂ based photoelectrodes", Proc. SPIE 6340, Solar Hydrogen and Nanotechnology, 63400G (8 September 2006); https://doi.org/10.1117/12.679887

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