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

    Research output: Contribution to journalArticlepeer-review

    33 Citations (Scopus)

    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 languageEnglish
    Article number1502154
    JournalAdvanced Energy Materials
    Volume6
    Issue number7
    DOIs
    Publication statusPublished - 2016 Apr 6

    Keywords

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

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Materials Science(all)

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