Wireless Photoelectrochemical Water Splitting Using Triple-Junction Solar Cell Protected by TiO2

Choongman Moon; Brian Seger; Peter Christian Kjærgaard Vesborg; Ole Hansen; Ib Chorkendorff

doi:10.1016/j.xcrp.2020.100261

Wireless Photoelectrochemical Water Splitting Using Triple-Junction Solar Cell Protected by TiO₂

Choongman Moon, Brian Seger, Peter Christian Kjærgaard Vesborg, Ole Hansen, Ib Chorkendorff^*

^*Corresponding author for this work

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Abstract

Photoelectrochemical (PEC) water splitting devices replace electrical contacts in a solid-state solar cell with a solid/liquid junction to improve the solar-to-H₂conversion efficiency and reduce system cost. The wireless configuration can fully use the advantage of the PEC by removing all electrical contacts; however, the wired configuration with the electrical contact on its back side has been widely studied to facilitate device characterization. In this study, a wireless PEC water splitting device made of a commercially available III-V triple-junction solar cell protected by transparent TiO₂ is demonstrated with high efficiency and stability. The wireless device produces both H₂ and O₂ products in a stoichiometric ratio in 13% of solar-to-H2 conversion efficiency over ∼12 h, and the total amount of H₂ product during the lifetime of the device reaches 51 mL/cm² , which is the highest value reported from wireless PEC devices to the best of our knowledge.

Original language	English
Article number	100261
Journal	Cell Reports Physical Science
Volume	1
Issue number	12
Number of pages	14
DOIs	https://doi.org/10.1016/j.xcrp.2020.100261
Publication status	Published - 2020

Bibliographical note

Funding Information:
The Center for Surface Physics and Catalysis is funded by the Villum Foundation V-SUSTAIN grant no. 9455 . We thank Micha Ben-Naim and Reuben J. Britto for sharing technical discussions on H2 lifetime.

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Cite this

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title = "Wireless Photoelectrochemical Water Splitting Using Triple-Junction Solar Cell Protected by TiO2",

abstract = "Photoelectrochemical (PEC) water splitting devices replace electrical contacts in a solid-state solar cell with a solid/liquid junction to improve the solar-to-H2conversion efficiency and reduce system cost. The wireless configuration can fully use the advantage of the PEC by removing all electrical contacts; however, the wired configuration with the electrical contact on its back side has been widely studied to facilitate device characterization. In this study, a wireless PEC water splitting device made of a commercially available III-V triple-junction solar cell protected by transparent TiO2 is demonstrated with high efficiency and stability. The wireless device produces both H2 and O2 products in a stoichiometric ratio in 13% of solar-to-H2 conversion efficiency over ∼12 h, and the total amount of H2 product during the lifetime of the device reaches 51 mL/cm2 , which is the highest value reported from wireless PEC devices to the best of our knowledge.",

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AU - Hansen, Ole

AU - Chorkendorff, Ib

N1 - Funding Information: The Center for Surface Physics and Catalysis is funded by the Villum Foundation V-SUSTAIN grant no. 9455 . We thank Micha Ben-Naim and Reuben J. Britto for sharing technical discussions on H2 lifetime.

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AB - Photoelectrochemical (PEC) water splitting devices replace electrical contacts in a solid-state solar cell with a solid/liquid junction to improve the solar-to-H2conversion efficiency and reduce system cost. The wireless configuration can fully use the advantage of the PEC by removing all electrical contacts; however, the wired configuration with the electrical contact on its back side has been widely studied to facilitate device characterization. In this study, a wireless PEC water splitting device made of a commercially available III-V triple-junction solar cell protected by transparent TiO2 is demonstrated with high efficiency and stability. The wireless device produces both H2 and O2 products in a stoichiometric ratio in 13% of solar-to-H2 conversion efficiency over ∼12 h, and the total amount of H2 product during the lifetime of the device reaches 51 mL/cm2 , which is the highest value reported from wireless PEC devices to the best of our knowledge.

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