BES021 Joint Center for Artificial Photosynthesis: Si Microwire-Based Solar Water Splitting Devices

Content Provider	Semantic Scholar
Author	Koval, Carl A. Atwater, Harry A. Lynd, Nathaniel A. Spurgeon, Joshua M. Sharp, Ian D. McDowell, Matthew T. Liang, Siwei Mclean, Gail
Copyright Year	2014
Abstract	Tandem junction (n–p + -Si/ITO/WO 3 /liquid) core–shell microwire devices for solar-driven water splitting have been designed, fabricated and investigated photoelectrochemically. The tandem devices exhibited open-circuit potentials of E OC =-1.21 V versus E 0 ’(O 2 /H 2 O), demonstrating additive voltages across the individual junctions (n–p + -Si Eoc =0.5 V versus solution; WO 3 /liquid E OC =-0.73 V versus E 0 ’(O 2 /H 2 O)). Optical concentration (12x, AM1.5D) shifted the open-circuit potential to E OC =1.27 V versus E 0 ’(O 2 /H 2 O) and resulted in unassisted H 2 production during two-electrode measurements (anode: tandem device, cathode: Pt disc). The solar energyconversion efficiencies were very low, 0.0068% and 0.0019% when the cathode compartment was saturated with Ar or H2, respectively, due to the non-optimal photovoltage and bandgap of the WO 3 that was used in the demonstration system to obtain stability of all of the system components under common operating conditions while also insuring product separation for safety purposes.
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Alternate Webpage(s)	https://www.hydrogen.energy.gov/pdfs/review14/bes021_shaner_2014_p.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article