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  4. Monolithic Photoelectrochemical Device for Direct Water Splitting with 19% Efficiency
 
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2018
Journal Article
Title

Monolithic Photoelectrochemical Device for Direct Water Splitting with 19% Efficiency

Abstract
Efficient unassisted solar water splitting, a pathway to storable renewable energy in the form of chemical bonds, requires optimization of a photoelectrochemical device based on photovoltaic tandem heterojunctions. We report a monolithic photocathode device architecture that exhibits significantly reduced surface reflectivity, minimizing parasitic light absorption and reflection losses. A tailored multifunctional crystalline titania interphase layer acts as a corrosion protection layer, with favorable band alignment between the semiconductor conduction band and the energy level for water reduction, facilitating electron transport at the cathode-electrolyte interface. It also provides a favorable substrate for adhesion of high-activity Rh catalyst nanoparticles. Under simulated AM 1.5G irradiation, solar-to-hydrogen efficiencies of 19.3 and 18.5% are obtained in acidic and neutral electrolytes, respectively. The system reaches a value of 0.85 of the theoretical limit for photoelectrochemical water splitting for the energy gap combination employed in the tandem-junction photoelectrode structure.
Author(s)
Cheng, Wen-Hui
Caltech
Richter, Matthias H.
Caltech
May, Matthias M.
University of Cambridge
Ohlmann, Jens  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Lackner, David  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Dimroth, Frank  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Hannappel, Thomas
TU Ilmenau
Atwater, Harry A.
Caltech
Lewerenz, Hans-Joachim
Caltech
Journal
ACS energy letters  
Project(s)
HyCon
Funder
Bundesministerium für Bildung und Forschung BMBF (Deutschland)  
Open Access
DOI
10.24406/publica-r-256699
10.1021/acsenergylett.8b00920
File(s)
N-535041.pdf (411.77 KB)
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
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