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Title: Efficient direct solar-to-hydrogen conversion by in situ interface transformation of a tandem structure

Abstract

Photosynthesis is nature's route to convert intermittent solar irradiation into storable energy, while its use for an industrial energy supply is impaired by low efficiency. Artificial photosynthesis provides a promising alternative for efficient robust carbon-neutral renewable energy generation. The approach of direct hydrogen generation by photoelectrochemical water splitting utilizes customized tandem absorber structures to mimic the Z-scheme of natural photosynthesis. Here a combined chemical surface transformation of a tandem structure and catalyst deposition at ambient temperature yields photocurrents approaching the theoretical limit of the absorber and results in a solar-to-hydrogen efficiency of 14%. The potentiostatically assisted photoelectrode efficiency is 17%. Present benchmarks for integrated systems are clearly exceeded. Details of the in situ interface transformation, the electronic improvement and chemical passivation are presented. The surface functionalization procedure is widely applicable and can be precisely controlled, allowing further developments of high-efficiency robust hydrogen generators.

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [4]
  1. Institute for Solar Fuels, Berlin (Germany). Helmholtz-Zentrum Berlin für Materialien und Energie GmbH; Technische Universität Ilmenau (Germany). Department of Physcis; Humboldt-Universität zu Berlin (Germany). Department of Physics
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
  3. Fraunhofer Institute for Solar Energy Systems ISE, Freiburg (Germany)
  4. Technische Universität Ilmenau (Germany). Department of Physcis
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1457517
Grant/Contract Number:  
SC0004993
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 30 DIRECT ENERGY CONVERSION

Citation Formats

May, Matthias M., Lewerenz, Hans-Joachim, Lackner, David, Dimroth, Frank, and Hannappel, Thomas. Efficient direct solar-to-hydrogen conversion by in situ interface transformation of a tandem structure. United States: N. p., 2015. Web. https://doi.org/10.1038/ncomms9286.
May, Matthias M., Lewerenz, Hans-Joachim, Lackner, David, Dimroth, Frank, & Hannappel, Thomas. Efficient direct solar-to-hydrogen conversion by in situ interface transformation of a tandem structure. United States. https://doi.org/10.1038/ncomms9286
May, Matthias M., Lewerenz, Hans-Joachim, Lackner, David, Dimroth, Frank, and Hannappel, Thomas. Tue . "Efficient direct solar-to-hydrogen conversion by in situ interface transformation of a tandem structure". United States. https://doi.org/10.1038/ncomms9286. https://www.osti.gov/servlets/purl/1457517.
@article{osti_1457517,
title = {Efficient direct solar-to-hydrogen conversion by in situ interface transformation of a tandem structure},
author = {May, Matthias M. and Lewerenz, Hans-Joachim and Lackner, David and Dimroth, Frank and Hannappel, Thomas},
abstractNote = {Photosynthesis is nature's route to convert intermittent solar irradiation into storable energy, while its use for an industrial energy supply is impaired by low efficiency. Artificial photosynthesis provides a promising alternative for efficient robust carbon-neutral renewable energy generation. The approach of direct hydrogen generation by photoelectrochemical water splitting utilizes customized tandem absorber structures to mimic the Z-scheme of natural photosynthesis. Here a combined chemical surface transformation of a tandem structure and catalyst deposition at ambient temperature yields photocurrents approaching the theoretical limit of the absorber and results in a solar-to-hydrogen efficiency of 14%. The potentiostatically assisted photoelectrode efficiency is 17%. Present benchmarks for integrated systems are clearly exceeded. Details of the in situ interface transformation, the electronic improvement and chemical passivation are presented. The surface functionalization procedure is widely applicable and can be precisely controlled, allowing further developments of high-efficiency robust hydrogen generators.},
doi = {10.1038/ncomms9286},
journal = {Nature Communications},
number = 1,
volume = 6,
place = {United States},
year = {2015},
month = {9}
}

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