TY - JOUR
T1 - Band Edge Engineering of Oxide Photoanodes for Photoelectrochemical Water Splitting
T2 - Integration of Subsurface Dipoles with Atomic-Scale Control
AU - Hikita, Yasuyuki
AU - Nishio, Kazunori
AU - Seitz, Linsey C.
AU - Chakthranont, Pongkarn
AU - Tachikawa, Takashi
AU - Jaramillo, Thomas F.
AU - Hwang, Harold Y.
N1 - Funding Information:
This work was supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering (heterostructure synthesis), and the Catalysis Science Program within the Chemical Sciences, Geosciences, and Biosciences Division (PEC characterization), under contract DE-AC02-76SF00515, and the Global Climate and Energy Project at Stanford University. L.C.S. acknowledges support from the DARE Doctoral Fellowship supported by the Vice Provost for Graduate Education at Stanford University. P.C. and T.F.J. were supported from an NSF project (award number CBET-1433442) competitively-selected under the solicitation NSF 14-15: NSF/DOE Partnership on Advanced Frontiers in Renewable Hydrogen Fuel Production via Solar Water Splitting Technologies, which was co-sponsored by the National Science Foundation, Division of Chemical, Bioengineering, Environmental, and Transport Systems (CBET), and the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office.
Publisher Copyright:
© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
PY - 2016/4/6
Y1 - 2016/4/6
N2 - 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. 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.
AB - 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. 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.
KW - interface dipoles
KW - oxide/electrolyte interfaces
KW - photoanodes
KW - photoelectrochemical cells
KW - solar water splitting
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U2 - 10.1002/aenm.201502154
DO - 10.1002/aenm.201502154
M3 - Article
AN - SCOPUS:84963700996
VL - 6
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
IS - 7
M1 - 1502154
ER -
