An aqueous, organic dye derivatized SnO2/TiO2 core/shell photoanode

Kyung Ryang Wee, Benjamin D. Sherman, M. Kyle Brennaman, Matthew V. Sheridan, Animesh Nayak, Leila Alibabaei, Thomas J. Meyer

Research output: Contribution to journalArticle

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Abstract

Visible light driven water splitting in a dye-sensitized photoelectrochemical cell (DSPEC) based on a phosphonic acid-derivatized donor-π-acceptor (D-π-A) organic dye (P-A-π-D) is described with the dye anchored to an FTO|SnO2/TiO2 core/shell photoanode in a pH 7 phosphate buffer solution. Transient absorption measurements on FTO|TiO2|-[P-A-π-D] compared to core/shell, FTO|SnO2/TiO2(3 nm)|-[P-A-π-D], reveal that excitation of the dye is rapid and efficient with a decrease in back electron rate by a factor of ∼10 on the core/shell. Upon visible, 1 sun excitation (100 mW cm-2) of FTO|SnO2/TiO2(3 nm)|-[P-A-π-D] in a phosphate buffer at pH 7 with 20 mM added hydroquinone (H2Q), photocurrents of ∼2.5 mA cm-2 are observed which are sustained over >15 min photolysis periods with a current enhancement of ∼30-fold compared to FTO|TiO2|-[P-A-π-D] due to the core/shell effect. On surfaces co-loaded with both -[P-A-π-D] and the known water oxidation catalyst, Ru(bda)(pyP)2 (pyP = pyridin-4-methyl phosphonic acid), maximum photocurrent levels of 1.4 mA cm-2 were observed which decreased over an 10 min interval to 0.1 mA cm-2. O2 was measured by use of a two-electrode, collector-generator sandwich cell and was produced in low faradaic efficiencies with the majority of the oxidative photocurrent due to oxidative decomposition of the dye.

LanguageEnglish (US)
Pages2969-2975
Number of pages7
JournalJournal of Materials Chemistry A
Volume4
Issue number8
DOIs
StatePublished - Jan 1 2016

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Coloring Agents
Dyes
Photocurrents
Buffers
Phosphates
Photoelectrochemical cells
Acids
Water
Photolysis
Sun
Decomposition
Oxidation
Electrodes
Catalysts
Electrons
phosphonic acid

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Wee, K. R., Sherman, B. D., Brennaman, M. K., Sheridan, M. V., Nayak, A., Alibabaei, L., & Meyer, T. J. (2016). An aqueous, organic dye derivatized SnO2/TiO2 core/shell photoanode. Journal of Materials Chemistry A, 4(8), 2969-2975. DOI: 10.1039/c5ta06678f

An aqueous, organic dye derivatized SnO2/TiO2 core/shell photoanode. / Wee, Kyung Ryang; Sherman, Benjamin D.; Brennaman, M. Kyle; Sheridan, Matthew V.; Nayak, Animesh; Alibabaei, Leila; Meyer, Thomas J.

In: Journal of Materials Chemistry A, Vol. 4, No. 8, 01.01.2016, p. 2969-2975.

Research output: Contribution to journalArticle

Wee, KR, Sherman, BD, Brennaman, MK, Sheridan, MV, Nayak, A, Alibabaei, L & Meyer, TJ 2016, 'An aqueous, organic dye derivatized SnO2/TiO2 core/shell photoanode' Journal of Materials Chemistry A, vol. 4, no. 8, pp. 2969-2975. DOI: 10.1039/c5ta06678f
Wee KR, Sherman BD, Brennaman MK, Sheridan MV, Nayak A, Alibabaei L et al. An aqueous, organic dye derivatized SnO2/TiO2 core/shell photoanode. Journal of Materials Chemistry A. 2016 Jan 1;4(8):2969-2975. Available from, DOI: 10.1039/c5ta06678f
Wee, Kyung Ryang ; Sherman, Benjamin D. ; Brennaman, M. Kyle ; Sheridan, Matthew V. ; Nayak, Animesh ; Alibabaei, Leila ; Meyer, Thomas J./ An aqueous, organic dye derivatized SnO2/TiO2 core/shell photoanode. In: Journal of Materials Chemistry A. 2016 ; Vol. 4, No. 8. pp. 2969-2975
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