Journal
ACS ENERGY LETTERS
Volume 1, Issue 3, Pages 603-606Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00279
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Funding
- U.S. Department of Energy Office of Science, Office of Basic Energy Sciences [DE-FG02-07ER15909]
- Direct For Education and Human Resources
- Division Of Graduate Education [GRANTS:14019567, 0947962] Funding Source: National Science Foundation
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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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