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


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 ?-Fe2O3 as dual photoanodes utilizes visible light up to 610?nm for water splitting, and shows stable photocurrents of 7.0±0.2?mA?cm-2 at 1.23 VRHE 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.

SUBMITTER: Kim JH 

PROVIDER: S-EPMC5477502 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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

Kim Jin Hyun JH   Jang Ji-Wook JW   Jo Yim Hyun YH   Abdi Fatwa F FF   Lee Young Hye YH   van de Krol Roel R   Lee Jae Sung JS  

Nature communications 20161214


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 devic  ...[more]

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