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Over 12% Light to Hydrogen Energy Conversion Efficiency of Hydrogen Generation from Water: New System Concept, Concentrated Photovoltaic Electrochemical Cell (CPEC)

Published online by Cambridge University Press:  25 January 2013

Katsushi Fujii ,
Shinichiro Nakamura ,
Kentaroh Watanabe ,
Behgol Bagheri ,
Masakazu Sugiyama  and
Yoshiaki Nakano
Katsushi Fujii
Affiliation:
Global Solar plus Initiative, c/o RCAST, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 JAPAN
Shinichiro Nakamura
Affiliation:
RIKEN Research Cluster for Innovation, Nakamura Lab., 2-1 Hirosawa, Wako, Saitama, 351-0198, JAPAN
Kentaroh Watanabe
Affiliation:
Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 JAPAN
Behgol Bagheri
Affiliation:
Global Solar plus Initiative, c/o RCAST, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 JAPAN
Masakazu Sugiyama
Affiliation:
School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, JAPAN
Yoshiaki Nakano
Affiliation:
Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 JAPAN
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Abstract

Energy storage is a key technology for establishing a stand-alone renewable energy system. Current energy-storage technologies are, however, not suitable for such an energy system. They are cost ineffective and/or are with low energy-conversion efficiency. Hydrogen generation and storage from water by sunlight is one of these technologies. In this study, a simple concept of hydrogen generation from water by using sunlight, “concentrated photovoltaic electrochemical cell (CPEC)” is proposed. It is experimentally shown that the CPEC operates stably and achieves conversion efficiency from light to hydrogen energy of over 12%.

Keywords

energy generationphotovoltaicH

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References

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