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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 18, Iss. S2 — Jun. 21, 2010
  • pp: A147–A160

Photoelectrolysis of water: Solar hydrogen–achievements and perspectives

Kȩstutis Juodkazis, Jurga Juodkazytė, Edgaras Jelmakas, Putinas Kalinauskas, Ignas Valsiūnas, Povilas Miečinskas, and Saulius Juodkazis  »View Author Affiliations


Optics Express, Vol. 18, Issue S2, pp. A147-A160 (2010)
http://dx.doi.org/10.1364/OE.18.00A147


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Abstract

Thermodynamic analysis of energy conversion from light-to-chemical, light-to-electric and electric-to-chemical is presented by the case study of water photoelectrolysis on TiO2 surface. It is demonstrated that at the current state-of-the-art energy conversion efficiency of water photoelectrolysis can be increased ∼17 times by separating the processes of solar-to-electric and electric-to-chemical energy conversion and optimizing them independently. This allows to mitigate a high overvoltage of oxygen evolution reaction with respect to thermodynamic E O 2 / H 2 O 0 = 1.23 V potential as well as spectrally narrow absorbtivity of solar light by TiO2 which determine the low efficiency (∼ 1.0%) of direct light-to-chemical energy conversion. Numerical estimates are provided illustrating practical principles for optimization of the solar energy conversion and storage processes.

© 2010 OSA

OCIS Codes
(240.6670) Optics at surfaces : Surface photochemistry
(350.5130) Other areas of optics : Photochemistry
(350.6050) Other areas of optics : Solar energy
(350.6670) Other areas of optics : Surface photochemistry

ToC Category:
Solar Fuel

History
Original Manuscript: March 22, 2010
Revised Manuscript: May 20, 2010
Manuscript Accepted: May 20, 2010
Published: May 25, 2010

Citation
Kȩstutis Juodkazis, Jurga Juodkazytė, Edgaras Jelmakas, Putinas Kalinauskas, Ignas Valsiūnas, Povilas Miečinskas, and Saulius Juodkazis, "Photoelectrolysis of water: Solar hydrogen–achievements and perspectives," Opt. Express 18, A147-A160 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-S2-A147


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