Photoelectrochemistry of core-shell tandem junction n-p+-Si/n- WO3 microwire array photoelectrodes

Matthew R. Shaner, Katherine T. Fountaine, Shane Ardo, Rob H. Coridan, Harry A. Atwater, Nathan S Lewis

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

Tandem junction (n-p+-Si/ITO/WO3/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 Eoc = -1.21 V versus E 0′(O2/H2O), demonstrating additive voltages across the individual junctions (n-p+-Si Eoc = -0.5 V versus solution; WO3/liquid Eoc = -0.73 V versus E0′(O2/H2O)). Optical concentration (12×, AM1.5D) shifted the open-circuit potential to Eoc = -1.27 V versus E0′(O2/H2O) and resulted in unassisted H2 production during two-electrode measurements (anode: tandem device, cathode: Pt disc). The solar energy-conversion 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 band-gap of the WO3 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.

Original languageEnglish
Pages (from-to)779-790
Number of pages12
JournalEnergy and Environmental Science
Volume7
Issue number2
DOIs
Publication statusPublished - 2014

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Cathodes
shell
liquid
Networks (circuits)
Liquids
Energy conversion
Solar energy
Conversion efficiency
Anodes
electrode
Energy gap
Demonstrations
safety
Electrodes
Water
Electric potential
water
solar energy
product
energy conversion

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering

Cite this

Photoelectrochemistry of core-shell tandem junction n-p+-Si/n- WO3 microwire array photoelectrodes. / Shaner, Matthew R.; Fountaine, Katherine T.; Ardo, Shane; Coridan, Rob H.; Atwater, Harry A.; Lewis, Nathan S.

In: Energy and Environmental Science, Vol. 7, No. 2, 2014, p. 779-790.

Research output: Contribution to journalArticle

Shaner, Matthew R. ; Fountaine, Katherine T. ; Ardo, Shane ; Coridan, Rob H. ; Atwater, Harry A. ; Lewis, Nathan S. / Photoelectrochemistry of core-shell tandem junction n-p+-Si/n- WO3 microwire array photoelectrodes. In: Energy and Environmental Science. 2014 ; Vol. 7, No. 2. pp. 779-790.
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