The effect of hole acceptors on the photocurrent response of particulate TiO2 anodes

JA Byrne, BR Eggins, S Linquette-Mailley, PSM Dunlop

Research output: Contribution to journalArticle

Abstract

The effect of different hole accepters on the photocurrent response of particulate TiO2 anodes was investigated. In all cases there was a significant increase in the photocurrent over that observed for the photoooxidation of water. The photocurrent efficiency observed in the presence of hole accepters followed the order: oxalate > formate > acetate > methanol. The order of efficiency of the hole accepters does not correlate with reported free hydroxyl radical reactivity constants or with reported oxidation potentials for the substrates studied. Adsorption measurements made in the dark showed that oxalate was much more strongly adsorbed on the electrode surface than either acetate or formate. Impedance spectroscopy indicated an increase in the capacitance of the system due to the presence of oxalate, both in the dark and under illumination.
LanguageEnglish
Pages2007-2012
JournalANALYST
Volume123
Issue number10
Publication statusPublished - Oct 1998

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formic acid
Oxalates
Photocurrents
Anodes
Acetates
Free radicals
Hydroxyl Radical
Methanol
Capacitance
Lighting
Spectroscopy
Adsorption
Oxidation
Electrodes
Water
Substrates

Cite this

Byrne, JA ; Eggins, BR ; Linquette-Mailley, S ; Dunlop, PSM. / The effect of hole acceptors on the photocurrent response of particulate TiO2 anodes. In: ANALYST. 1998 ; Vol. 123, No. 10. pp. 2007-2012.
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abstract = "The effect of different hole accepters on the photocurrent response of particulate TiO2 anodes was investigated. In all cases there was a significant increase in the photocurrent over that observed for the photoooxidation of water. The photocurrent efficiency observed in the presence of hole accepters followed the order: oxalate > formate > acetate > methanol. The order of efficiency of the hole accepters does not correlate with reported free hydroxyl radical reactivity constants or with reported oxidation potentials for the substrates studied. Adsorption measurements made in the dark showed that oxalate was much more strongly adsorbed on the electrode surface than either acetate or formate. Impedance spectroscopy indicated an increase in the capacitance of the system due to the presence of oxalate, both in the dark and under illumination.",
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Byrne, JA, Eggins, BR, Linquette-Mailley, S & Dunlop, PSM 1998, 'The effect of hole acceptors on the photocurrent response of particulate TiO2 anodes', ANALYST, vol. 123, no. 10, pp. 2007-2012.

The effect of hole acceptors on the photocurrent response of particulate TiO2 anodes. / Byrne, JA; Eggins, BR; Linquette-Mailley, S; Dunlop, PSM.

In: ANALYST, Vol. 123, No. 10, 10.1998, p. 2007-2012.

Research output: Contribution to journalArticle

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AB - The effect of different hole accepters on the photocurrent response of particulate TiO2 anodes was investigated. In all cases there was a significant increase in the photocurrent over that observed for the photoooxidation of water. The photocurrent efficiency observed in the presence of hole accepters followed the order: oxalate > formate > acetate > methanol. The order of efficiency of the hole accepters does not correlate with reported free hydroxyl radical reactivity constants or with reported oxidation potentials for the substrates studied. Adsorption measurements made in the dark showed that oxalate was much more strongly adsorbed on the electrode surface than either acetate or formate. Impedance spectroscopy indicated an increase in the capacitance of the system due to the presence of oxalate, both in the dark and under illumination.

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