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 | |
| Publication status | Published - Sep 9 2016 |
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ASJC Scopus subject areas
- Chemistry (miscellaneous)
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology
- Materials Chemistry
Cite this
Rutile TiO2 as an Anode Material for Water-Splitting Dye-Sensitized Photoelectrochemical Cells. / Swierk, John R.; Regan, Kevin P.; Jiang, Jianbing; Brudvig, Gary W; Schmuttenmaer, Charles A.
In: ACS Energy Letters, Vol. 1, No. 3, 09.09.2016, p. 603-606.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Rutile TiO2 as an Anode Material for Water-Splitting Dye-Sensitized Photoelectrochemical Cells
AU - Swierk, John R.
AU - Regan, Kevin P.
AU - Jiang, Jianbing
AU - Brudvig, Gary W
AU - Schmuttenmaer, Charles A.
PY - 2016/9/9
Y1 - 2016/9/9
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85020564005&partnerID=8YFLogxK
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U2 - 10.1021/acsenergylett.6b00279
DO - 10.1021/acsenergylett.6b00279
M3 - Article
AN - SCOPUS:85020564005
VL - 1
SP - 603
EP - 606
JO - ACS Energy Letters
JF - ACS Energy Letters
SN - 2380-8195
IS - 3
ER -