Band Edge Engineering of Oxide Photoanodes for Photoelectrochemical Water Splitting: Integration of Subsurface Dipoles with Atomic-Scale Control

Yasuyuki Hikita; Kazunori Nishio; Linsey C. Seitz; Pongkarn Chakthranont; Takashi Tachikawa; Thomas F. Jaramillo; Harold Y. Hwang

doi:10.1002/aenm.201502154

Band Edge Engineering of Oxide Photoanodes for Photoelectrochemical Water Splitting: Integration of Subsurface Dipoles with Atomic-Scale Control

Yasuyuki Hikita^*, Kazunori Nishio, Linsey C. Seitz, Pongkarn Chakthranont, Takashi Tachikawa, Thomas F. Jaramillo, Harold Y. Hwang

^*Corresponding author for this work

Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

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.

Original language	English (US)
Article number	1502154
Journal	Advanced Energy Materials
Volume	6
Issue number	7
DOIs	https://doi.org/10.1002/aenm.201502154
State	Published - Apr 6 2016

Funding

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.

Keywords

interface dipoles
oxide/electrolyte interfaces
photoanodes
photoelectrochemical cells
solar water splitting

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Materials Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/aenm.201502154

Cite this

@article{a11527504b1a4874a052280d5634c5d0,

title = "Band Edge Engineering of Oxide Photoanodes for Photoelectrochemical Water Splitting: Integration of Subsurface Dipoles with Atomic-Scale Control",

abstract = "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.",

keywords = "interface dipoles, oxide/electrolyte interfaces, photoanodes, photoelectrochemical cells, solar water splitting",

author = "Yasuyuki Hikita and Kazunori Nishio and Seitz, {Linsey C.} and Pongkarn Chakthranont and Takashi Tachikawa and Jaramillo, {Thomas F.} and Hwang, {Harold Y.}",

note = "Publisher Copyright: {\textcopyright} 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.",

year = "2016",

month = apr,

day = "6",

doi = "10.1002/aenm.201502154",

language = "English (US)",

volume = "6",

journal = "Advanced Energy Materials",

issn = "1614-6832",

publisher = "John Wiley and Sons Inc.",

number = "7",

}

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.

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

UR - http://www.scopus.com/inward/record.url?scp=84963700996&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84963700996&partnerID=8YFLogxK

U2 - 10.1002/aenm.201502154

DO - 10.1002/aenm.201502154

M3 - Article

AN - SCOPUS:84963700996

SN - 1614-6832

VL - 6

JO - Advanced Energy Materials

JF - Advanced Energy Materials

IS - 7

M1 - 1502154

ER -

Band Edge Engineering of Oxide Photoanodes for Photoelectrochemical Water Splitting: Integration of Subsurface Dipoles with Atomic-Scale Control

Abstract

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this