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Title: Solar hydrogen production using epitaxial SrTiO 3 on a GaAs photovoltaic

We demonstrate an oxide-stabilized III–V photoelectrode architecture for solar fuel production from water in neutral pH. For this tunable architecture we demonstrate 100% Faradaic efficiency for hydrogen evolution, and incident photon-to-current efficiencies (IPCE) exceeding 50%. High IPCE for hydrogen evolution is a consequence of the low-loss interface achieved via epitaxial growth of a thin oxide on a GaAs solar cell. Developing optimal energetic alignment across the interfaces of the photoelectrode using well-established III–V technology is key to obtaining high performance. This advance constitutes a critical milestone towards efficient, unassisted fuel production from solar energy.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ;  [6] ;  [7] ;  [8] ;  [9] ;  [1] ;  [10]
  1. Yale Univ., New Haven, CT (United States). Dept. of Applied Physics and Center for Research on Interface Structures and Phenomena
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering; University of California San Diego, La Jolla, CA (United States). Dept. of Nanoengineering
  3. Yale Univ., New Haven, CT (United States). Dept. of Electrical Engineering
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering; University of Bologna (Italy). Dept. of Chemistry
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  7. Yale Univ., New Haven, CT (United States). Center for Research on Interface Structures and Phenomena and Dept. of Chemical Engineering and Environmental Engineering
  8. Yale Univ., New Haven, CT (United States). Dept. of Electrical Engineering; University of Illinois at Urbana-Champaign, Urbana, IL (United States). Department of Electrical and Computer Engineering
  9. Yale Univ., New Haven, CT (United States). Dept. of Applied Physics, Center for Research on Interface Structures and Phenomena and Dept. of Mechanical Engineering & Materials Science
  10. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering and Dept. of Materials Science and Engineering
Publication Date:
Report Number(s):
BNL-113819-2017-JA
Journal ID: ISSN 1754-5692; R&D Project: MA015MACA; KC0201010
Grant/Contract Number:
SC0012704; AR0000508; AC02-98CH10886; DMR-1309868
Type:
Accepted Manuscript
Journal Name:
Energy & Environmental Science
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 1754-5692
Publisher:
Royal Society of Chemistry
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 08 HYDROGEN
OSTI Identifier:
1358013