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Published February 9, 2011 | Version Supplemental Material
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Photoelectrochemical Hydrogen Evolution Using Si Microwire Arrays

Creators

  • 1. ROR icon California Institute of Technology

Abstract

Arrays of B-doped p-Si microwires, diffusion-doped with P to form a radial n+ emitter and subsequently coated with a 1.5-nm-thick discontinuous film of evaporated Pt, were used as photocathodes for H_2 evolution from water. These electrodes yielded thermodynamically based energy-conversion efficiencies >5% under 1 sun solar simulation, despite absorbing less than 50% of the above-band-gap incident photons. Analogous p-Si wire-array electrodes yielded efficiencies <0.2%, largely limited by the low photovoltage generated at the p-Si/H_2O junction.

Additional Information

© 2011 American Chemical Society. Received: October 10, 2010. Published In Issue February 09, 2011. Article ASAP January 07, 2011. The Department of Energy (DE-FG02-05ER15754), the Stanford Global Climate and Energy Project, and Toyota are acknowledged for financial support. S.W.B thanks the Kavli Nanoscience Institute for a postdoctoral fellowship. M.G.W acknowledges support from an NSF American Competitiveness in Chemistry postdoctoral fellowship (CHE-0937048).

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Additional details

Identifiers

Eprint ID
22849
DOI
10.1021/ja108801m
Resolver ID
CaltechAUTHORS:20110314-101144886

Related works

Describes
10.1021/ja108801m (DOI)

Funding

Department of Energy (DOE)
DE-FG02-05ER15754
Stanford Global Climate and Energy Project
Toyota
Kavli Nanoscience Institute
NSF Postdoctoral Fellowship
CHE-0937048

Dates

Created
2011-03-15
Created from EPrint's datestamp field
Updated
2021-11-09
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Kavli Nanoscience Institute