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Hetero-type dual photoanodes for unbiased solar water splitting with extended light harvesting

Title
Hetero-type dual photoanodes for unbiased solar water splitting with extended light harvesting
Authors
Kim, J.HJang, Ji-WookJo, Yim HyunAbdi, Fatwa F.Lee, Young Hyevan de Krol, RoelLee, Jae Sung
Date Issued
Dec-2016
Publisher
Nature Publishing Group
Abstract
Metal oxide semiconductors are promising photoelectrode materials for solar water splitting due to their robustness in aqueous solutions and low cost. Yet, their solar-to-hydrogen conversion efficiencies are still not high enough for practical applications. Here we present a strategy to enhance the efficiency of metal oxides, hetero-type dual photoelectrodes, in which two photoanodes of different bandgaps are connected in parallel for extended light harvesting. Thus, a photoelectrochemical device made of modified BiVO4 and alpha-Fe2O3 as dual photoanodes utilizes visible light up to 610nm for water splitting, and shows stable photocurrents of 7.0 +/- 0.2 mA cm(-2) at 1.23 V-RHE under 1 sun irradiation. A tandem cell composed with the dual photoanodes-silicon solar cell demonstrates unbiased water splitting efficiency of 7.7%. These results and concept represent a significant step forward en route to the goal of >10% efficiency required for practical solar hydrogen production.
URI
http://oasis.postech.ac.kr/handle/2014.oak/92313
ISSN
2041-1723
Article Type
Article
Citation
Nature Communications, vol. 7, page. 1 - 7, 2016-12
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