Progress and problems in visible light water splitting

Yixin Zhao, Emil A. Hernandez-Pagan, Nella M. Vargas-Barbosa, Seung Hyun Anna Lee, W. Justin Youngblood, Eugene S. Smotkin, Thomas E. Mallouk, Ana L. Moore, Thomas A. Moore, Devens Gust

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. In these cells and in semiconductor-based photoelectrochemical cells, there are system-level issues that must be considered in the context of water electrolysis. These include the need for membranes that conduct protons at the pH where the electrocatalysts operate and where the other components of the system are stable, as well as the problem of fuel crossover and catalytic oxidation. We will report the effects of some of these parameters in membrane-based cells containing phosphate and borate electrolytes. In the water-splitting dye cell, the quantum efficiency is sensitive to the presence of buffers because protons generated at the photoanode lower the driving force for water oxidation and thus complicate the electron transfer kinetics. New strategies for controlling the relative rates of forward and back electron transfer in these cells will be described.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - Dec 1 2011
Event242nd ACS National Meeting and Exposition - Denver, CO, United States
Duration: Aug 28 2011Sep 1 2011

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Water
Protons
Coloring Agents
Dyes
Photoelectrochemical cells
Membranes
Borates
Photosensitizing Agents
Photosensitizers
Electrons
Electrocatalysts
Catalytic oxidation
Quantum efficiency
Electrolysis
Oxides
Electrolytes
Transition metals
Buffers
Phosphates
Semiconductor materials

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Zhao, Y., Hernandez-Pagan, E. A., Vargas-Barbosa, N. M., Lee, S. H. A., Youngblood, W. J., Smotkin, E. S., ... Gust, D. (2011). Progress and problems in visible light water splitting. ACS National Meeting Book of Abstracts.
Zhao, Yixin ; Hernandez-Pagan, Emil A. ; Vargas-Barbosa, Nella M. ; Lee, Seung Hyun Anna ; Youngblood, W. Justin ; Smotkin, Eugene S. ; Mallouk, Thomas E. ; Moore, Ana L. ; Moore, Thomas A. ; Gust, Devens. / Progress and problems in visible light water splitting. In: ACS National Meeting Book of Abstracts. 2011.
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Zhao, Y, Hernandez-Pagan, EA, Vargas-Barbosa, NM, Lee, SHA, Youngblood, WJ, Smotkin, ES, Mallouk, TE, Moore, AL, Moore, TA & Gust, D 2011, 'Progress and problems in visible light water splitting', ACS National Meeting Book of Abstracts.

Progress and problems in visible light water splitting. / Zhao, Yixin; Hernandez-Pagan, Emil A.; Vargas-Barbosa, Nella M.; Lee, Seung Hyun Anna; Youngblood, W. Justin; Smotkin, Eugene S.; Mallouk, Thomas E.; Moore, Ana L.; Moore, Thomas A.; Gust, Devens.

In: ACS National Meeting Book of Abstracts, 01.12.2011.

Research output: Contribution to journalConference article

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AU - Zhao, Yixin

AU - Hernandez-Pagan, Emil A.

AU - Vargas-Barbosa, Nella M.

AU - Lee, Seung Hyun Anna

AU - Youngblood, W. Justin

AU - Smotkin, Eugene S.

AU - Mallouk, Thomas E.

AU - Moore, Ana L.

AU - Moore, Thomas A.

AU - Gust, Devens

PY - 2011/12/1

Y1 - 2011/12/1

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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. In these cells and in semiconductor-based photoelectrochemical cells, there are system-level issues that must be considered in the context of water electrolysis. These include the need for membranes that conduct protons at the pH where the electrocatalysts operate and where the other components of the system are stable, as well as the problem of fuel crossover and catalytic oxidation. We will report the effects of some of these parameters in membrane-based cells containing phosphate and borate electrolytes. In the water-splitting dye cell, the quantum efficiency is sensitive to the presence of buffers because protons generated at the photoanode lower the driving force for water oxidation and thus complicate the electron transfer kinetics. New strategies for controlling the relative rates of forward and back electron transfer in these cells will be described.

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Zhao Y, Hernandez-Pagan EA, Vargas-Barbosa NM, Lee SHA, Youngblood WJ, Smotkin ES et al. Progress and problems in visible light water splitting. ACS National Meeting Book of Abstracts. 2011 Dec 1.