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This content will become publicly available on January 22, 2017

Title: Band edge engineering of oxide photoanodes for photoelectrochemical water splitting: Integration of subsurface dipoles with atomic-scale control

One of the crucial parameters dictating the efficiency of photoelectrochemical water-splitting is the semiconductor band edge alignment with respect to hydrogen and oxygen redox potentials. Despite the importance of metal oxides in their use as photoelectrodes, studies to control the band edge alignment in aqueous solution have been limited predominantly to compound semiconductors with modulation ranges limited to a few hundred mV. The ability to modulate the flat band potential of oxide photoanodes by as much as 1.3 V, using the insertion of subsurface electrostatic dipoles near a Nb-doped SrTiO3/aqueous electrolyte interface is reported. Lastly, the tunable range achieved far exceeds previous reports in any semiconductor/aqueous electrolyte system and suggests a general design strategy for highly efficient oxide photoelectrodes.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [2] ;  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  3. Stanford Univ., Stanford, CA (United States)
Publication Date:
OSTI Identifier:
1234195
Report Number(s):
SLAC-PUB--16452
Journal ID: ISSN 1614-6840
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials (Online)
Additional Journal Information:
Journal Name: Advanced Energy Materials (Online); Journal Volume: 6; Journal Issue: 7; Journal ID: ISSN 1614-6840
Publisher:
Wiley
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE CHEM; ENG; MATSCI; interface dipoles; oxide/electrolyte interfaces; photoelectrochemical cells; solar water splitting; SrTiO3