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Title: Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays

Abstract

Free-standing, membrane-embedded, Si microwire arrays have been used to affect the solar-driven, unassisted splitting of HI into H 2 and I 3-. The Si microwire arrays were grown by a chemical-vapor-deposition vapor–liquid–solid growth process using Cu growth catalysts, with a radial n +p junction then formed on each microwire. A Nafion proton-exchange membrane was introduced between the microwires and Pt electrocatalysts were then photoelectrochemically deposited on the microwires. The composite Si/Pt–Nafion membrane was mechanically removed from the growth substrate, and Pt electrocatalysts were then also deposited on the back side of the structure. The resulting membrane-bound Si microwire arrays spontaneously split concentrated HI into H 2(g) and I 3- under 1 Sun of simulated solar illumination. The reaction products (i.e. H 2 and I 3-) were confirmed by mass spectrometry and ultraviolet–visible electronic absorption spectroscopy.

Authors:
 [1];  [2];  [1];  [3]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). Thomas J. Watson Laboratories of Applied Physics
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering, Beckman Institute, and Kavli Nanoscience Institute; Joint Center for Artificial Photosynthesis, Pasadena, CA (United States)
Publication Date:
Research Org.:
California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC)
OSTI Identifier:
1457530
Grant/Contract Number:  
SC0004993
Resource Type:
Accepted Manuscript
Journal Name:
Energy & Environmental Science
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 1754-5692
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE

Citation Formats

Ardo, Shane, Park, Sang Hee, Warren, Emily L., and Lewis, Nathan S. Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays. United States: N. p., 2015. Web. doi:10.1039/c5ee00227c.
Ardo, Shane, Park, Sang Hee, Warren, Emily L., & Lewis, Nathan S. Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays. United States. doi:10.1039/c5ee00227c.
Ardo, Shane, Park, Sang Hee, Warren, Emily L., and Lewis, Nathan S. Wed . "Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays". United States. doi:10.1039/c5ee00227c. https://www.osti.gov/servlets/purl/1457530.
@article{osti_1457530,
title = {Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays},
author = {Ardo, Shane and Park, Sang Hee and Warren, Emily L. and Lewis, Nathan S.},
abstractNote = {Free-standing, membrane-embedded, Si microwire arrays have been used to affect the solar-driven, unassisted splitting of HI into H2 and I3-. The Si microwire arrays were grown by a chemical-vapor-deposition vapor–liquid–solid growth process using Cu growth catalysts, with a radial n+p junction then formed on each microwire. A Nafion proton-exchange membrane was introduced between the microwires and Pt electrocatalysts were then photoelectrochemically deposited on the microwires. The composite Si/Pt–Nafion membrane was mechanically removed from the growth substrate, and Pt electrocatalysts were then also deposited on the back side of the structure. The resulting membrane-bound Si microwire arrays spontaneously split concentrated HI into H2(g) and I3- under 1 Sun of simulated solar illumination. The reaction products (i.e. H2 and I3-) were confirmed by mass spectrometry and ultraviolet–visible electronic absorption spectroscopy.},
doi = {10.1039/c5ee00227c},
journal = {Energy & Environmental Science},
number = 5,
volume = 8,
place = {United States},
year = {2015},
month = {4}
}

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Cited by: 14 works
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