Optimizing electron and proton transfer in water splitting dye-sensitized solar cells

Seung Hyun Anna Lee, W. Justin Youngblood, Landy Blasdel, Lucas Jellison, Deanna Lentz, Thomas A. Moore, Ana L. Moore, Devens Gust, Thomas E. Mallouk

Research output: Contribution to journalConference article

Abstract

Visible light water splitting in dye sensitized solar cells has now been reported by several groups who have used transition metal oxides or dyes coupled to catalyst clusters as photosensitizers. Iridium oxide nanoparticles, recently characterized electrochemically by Murray and coworkers, are especially good catalysts for the oxygen evolution reaction in these photoelectrochemical cells. We have found that ruthenium polypyridyl dye molecules coupled to IrO2 clusters via malonate linkages can sensitize porous TiO2 electrodes, and that the low overall quantum yield for water splitting (∼1%) can be understood in terms of competing back electron transfer pathways. This talk describes several strategies for improving the quantum yield. When a thin layer of a wide-bandgap oxide (Nb2O5 or ZrO2) is added between the sensitizer and TiO2, back electron transfer becomes slower and the quantum yield roughly doubles. The timescale of photocurrent decay (tens of seconds) suggests that the local decrease in pH that accompanies oxygen evolution in the porous TiO2 film slows down electron transfer from Ir(IV) to Ru(III). We will describe the results of experiments that test this hypothesis, as well as strategies for increasing the fraction of sensitizer molecules that bridge between TiO2 and IrO2.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - Dec 1 2010
Event240th ACS National Meeting and Exposition - Boston, MA, United States
Duration: Aug 22 2010Aug 26 2010

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Proton transfer
Quantum yield
Oxides
Electrons
Water
Coloring Agents
Dyes
Oxygen
Photoelectrochemical cells
Catalysts
Molecules
Photosensitizing Agents
Photosensitizers
Ruthenium
Iridium
Photocurrents
Transition metals
Energy gap
Nanoparticles
Electrodes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Lee, S. H. A., Youngblood, W. J., Blasdel, L., Jellison, L., Lentz, D., Moore, T. A., ... Mallouk, T. E. (2010). Optimizing electron and proton transfer in water splitting dye-sensitized solar cells. ACS National Meeting Book of Abstracts.
Lee, Seung Hyun Anna ; Youngblood, W. Justin ; Blasdel, Landy ; Jellison, Lucas ; Lentz, Deanna ; Moore, Thomas A. ; Moore, Ana L. ; Gust, Devens ; Mallouk, Thomas E. / Optimizing electron and proton transfer in water splitting dye-sensitized solar cells. In: ACS National Meeting Book of Abstracts. 2010.
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abstract = "Visible light water splitting in dye sensitized solar cells has now been reported by several groups who have used transition metal oxides or dyes coupled to catalyst clusters as photosensitizers. Iridium oxide nanoparticles, recently characterized electrochemically by Murray and coworkers, are especially good catalysts for the oxygen evolution reaction in these photoelectrochemical cells. We have found that ruthenium polypyridyl dye molecules coupled to IrO2 clusters via malonate linkages can sensitize porous TiO2 electrodes, and that the low overall quantum yield for water splitting (∼1{\%}) can be understood in terms of competing back electron transfer pathways. This talk describes several strategies for improving the quantum yield. When a thin layer of a wide-bandgap oxide (Nb2O5 or ZrO2) is added between the sensitizer and TiO2, back electron transfer becomes slower and the quantum yield roughly doubles. The timescale of photocurrent decay (tens of seconds) suggests that the local decrease in pH that accompanies oxygen evolution in the porous TiO2 film slows down electron transfer from Ir(IV) to Ru(III). We will describe the results of experiments that test this hypothesis, as well as strategies for increasing the fraction of sensitizer molecules that bridge between TiO2 and IrO2.",
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Lee, SHA, Youngblood, WJ, Blasdel, L, Jellison, L, Lentz, D, Moore, TA, Moore, AL, Gust, D & Mallouk, TE 2010, 'Optimizing electron and proton transfer in water splitting dye-sensitized solar cells', ACS National Meeting Book of Abstracts.

Optimizing electron and proton transfer in water splitting dye-sensitized solar cells. / Lee, Seung Hyun Anna; Youngblood, W. Justin; Blasdel, Landy; Jellison, Lucas; Lentz, Deanna; Moore, Thomas A.; Moore, Ana L.; Gust, Devens; Mallouk, Thomas E.

In: ACS National Meeting Book of Abstracts, 01.12.2010.

Research output: Contribution to journalConference article

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T1 - Optimizing electron and proton transfer in water splitting dye-sensitized solar cells

AU - Lee, Seung Hyun Anna

AU - Youngblood, W. Justin

AU - Blasdel, Landy

AU - Jellison, Lucas

AU - Lentz, Deanna

AU - Moore, Thomas A.

AU - Moore, Ana L.

AU - Gust, Devens

AU - Mallouk, Thomas E.

PY - 2010/12/1

Y1 - 2010/12/1

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AB - Visible light water splitting in dye sensitized solar cells has now been reported by several groups who have used transition metal oxides or dyes coupled to catalyst clusters as photosensitizers. Iridium oxide nanoparticles, recently characterized electrochemically by Murray and coworkers, are especially good catalysts for the oxygen evolution reaction in these photoelectrochemical cells. We have found that ruthenium polypyridyl dye molecules coupled to IrO2 clusters via malonate linkages can sensitize porous TiO2 electrodes, and that the low overall quantum yield for water splitting (∼1%) can be understood in terms of competing back electron transfer pathways. This talk describes several strategies for improving the quantum yield. When a thin layer of a wide-bandgap oxide (Nb2O5 or ZrO2) is added between the sensitizer and TiO2, back electron transfer becomes slower and the quantum yield roughly doubles. The timescale of photocurrent decay (tens of seconds) suggests that the local decrease in pH that accompanies oxygen evolution in the porous TiO2 film slows down electron transfer from Ir(IV) to Ru(III). We will describe the results of experiments that test this hypothesis, as well as strategies for increasing the fraction of sensitizer molecules that bridge between TiO2 and IrO2.

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Lee SHA, Youngblood WJ, Blasdel L, Jellison L, Lentz D, Moore TA et al. Optimizing electron and proton transfer in water splitting dye-sensitized solar cells. ACS National Meeting Book of Abstracts. 2010 Dec 1.