Rutile TiO2 as an Anode Material for Water-Splitting Dye-Sensitized Photoelectrochemical Cells

John R. Swierk; Kevin P. Regan; Jianbing Jiang; Gary W Brudvig; Charles A. Schmuttenmaer

doi:10.1021/acsenergylett.6b00279

Rutile TiO₂ as an Anode Material for Water-Splitting Dye-Sensitized Photoelectrochemical Cells

John R. Swierk, Kevin P. Regan, Jianbing Jiang, Gary W Brudvig, Charles A. Schmuttenmaer

Yale University

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

40 Citations (Scopus)

Abstract

Water-splitting dye-sensitized photoelectrochemical cells (WS-DSPECs) use a wide bandgap metal oxide semiconductor functionalized with a light-absorbing dye and water-oxidation catalyst to harvest light and drive water oxidation, respectively. We demonstrate here that the rutile polymorph of TiO₂ (r-TiO₂) is a promising anode material for WS-DSPECs. Recombination between the injected electron and oxidized sensitizer with r-TiO₂ is an order of magnitude slower than with anatase TiO₂ (a-TiO₂), with injection yields approaching 100%. Studies with a reductive quencher demonstrate that r-TiO₂ is significantly more efficient than a-TiO₂, while exhibiting greater dye stability. Furthermore, comparison of direct band gap excitation photocurrent generation for bare and sensitized r-TiO₂ suggests that the sensitizer functions as a light harvester and redox mediator.

Original language	English
Pages (from-to)	603-606
Number of pages	4
Journal	ACS Energy Letters
Volume	1
Issue number	3
DOIs	https://doi.org/10.1021/acsenergylett.6b00279
Publication status	Published - Sep 9 2016

ASJC Scopus subject areas

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

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abstract = "Water-splitting dye-sensitized photoelectrochemical cells (WS-DSPECs) use a wide bandgap metal oxide semiconductor functionalized with a light-absorbing dye and water-oxidation catalyst to harvest light and drive water oxidation, respectively. We demonstrate here that the rutile polymorph of TiO2 (r-TiO2) is a promising anode material for WS-DSPECs. Recombination between the injected electron and oxidized sensitizer with r-TiO2 is an order of magnitude slower than with anatase TiO2 (a-TiO2), with injection yields approaching 100%. Studies with a reductive quencher demonstrate that r-TiO2 is significantly more efficient than a-TiO2, while exhibiting greater dye stability. Furthermore, comparison of direct band gap excitation photocurrent generation for bare and sensitized r-TiO2 suggests that the sensitizer functions as a light harvester and redox mediator.",

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AU - Brudvig, Gary W

AU - Schmuttenmaer, Charles A.

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