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

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

doi:10.1002/aenm.201502154

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

Journal Article · Fri Jan 22 00:00:00 EST 2016 · Advanced Energy Materials (Online)

DOI:https://doi.org/10.1002/aenm.201502154· OSTI ID:1234195

Hikita, Yasuyuki ^[1]; Nishio, Kazunori ^[2]; Seitz, Linsey C. ^[3]; Chakthranont, Pongkarn ^[3]; Tachikawa, Takashi ^[1]; Jaramillo, Thomas F. ^[2]; Hwang, Harold Y. ^[2]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Stanford Univ., Stanford, CA (United States)

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1234195

Report Number(s):: SLAC-PUB-16452

Journal Information:: Advanced Energy Materials (Online), Vol. 6, Issue 7; ISSN 1614-6840

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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

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