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Photocatalytically driven dissolution of macroscopic metal surfaces. Part 1: Silver

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Photocatalytically driven dissolution of macroscopic metal surfaces. Part 1: Silver. / Wilbraham, Richard J.; Boxall, Colin; Taylor, Robin J.
In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 249, 01.12.2012, p. 21-28.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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Wilbraham RJ, Boxall C, Taylor RJ. Photocatalytically driven dissolution of macroscopic metal surfaces. Part 1: Silver. Journal of Photochemistry and Photobiology A: Chemistry. 2012 Dec 1;249:21-28. doi: 10.1016/j.jphotochem.2012.09.003

Author

Wilbraham, Richard J. ; Boxall, Colin ; Taylor, Robin J. / Photocatalytically driven dissolution of macroscopic metal surfaces. Part 1 : Silver. In: Journal of Photochemistry and Photobiology A: Chemistry. 2012 ; Vol. 249. pp. 21-28.

Bibtex

@article{cab9831993c846e2975eb6793aed6971,
title = "Photocatalytically driven dissolution of macroscopic metal surfaces. Part 1: Silver",
abstract = "We present the first observation of photocatalytically driven, hydrogen peroxide mediated, dissolution of a macroscopic metal surface. Specifically, we report on the dissolution of silver in the presence of photocatalytically generated H2O2 produced by ultra-band gap illumination of TiO2 at 365 nm in the presence of O-2. Direct measurements of photocatalytically generated H2O2 in the TiO2 suspensions studied indicate that peroxide concentration never exceeds 32 mu mol dm(-3). However, comparison of electrochemical quartz crystal microgravimetrically determined rates of Ag dissolution with rates recorded from solutions spiked with H2O2 indicates that dissolution occurs at a rate equivalent to a bulk solution concentration of 100 mmol dm(-3) H2O2. This suggests that a local enhancement occurs in the rate of photocatalytically induced metal dissolution on surfaces under direct illumination, which is attributed to two causes: (i) local modification of the TiO2 by deposition of dissolved Ag, so increasing its efficiency for peroxide generation; and (ii) peroxide generation local to the electrode surface mitigating against photolytic loss reactions seen to occur in the solution bulk. The photoinduced dissolution process is found to be both highly controllable/light switchable and spatially specific. (C) 2012 Elsevier B.V. All rights reserved.",
keywords = "OXYGEN REDUCTION, TIO2 PARTICLES, SEMICONDUCTOR PHOTOCATALYSIS, LIGHT, HYDROGEN-PEROXIDE, WATER, Hydrogen peroxide, Quartz crystal microbalance, QUARTZ-CRYSTAL MICROBALANCE, PHOTOREDUCTION, Corrosion, Electrochemistry, OXIDATION, Silver, TITANIUM-DIOXIDE",
author = "Wilbraham, {Richard J.} and Colin Boxall and Taylor, {Robin J.}",
year = "2012",
month = dec,
day = "1",
doi = "10.1016/j.jphotochem.2012.09.003",
language = "English",
volume = "249",
pages = "21--28",
journal = "Journal of Photochemistry and Photobiology A: Chemistry",
issn = "1010-6030",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Photocatalytically driven dissolution of macroscopic metal surfaces. Part 1

T2 - Silver

AU - Wilbraham, Richard J.

AU - Boxall, Colin

AU - Taylor, Robin J.

PY - 2012/12/1

Y1 - 2012/12/1

N2 - We present the first observation of photocatalytically driven, hydrogen peroxide mediated, dissolution of a macroscopic metal surface. Specifically, we report on the dissolution of silver in the presence of photocatalytically generated H2O2 produced by ultra-band gap illumination of TiO2 at 365 nm in the presence of O-2. Direct measurements of photocatalytically generated H2O2 in the TiO2 suspensions studied indicate that peroxide concentration never exceeds 32 mu mol dm(-3). However, comparison of electrochemical quartz crystal microgravimetrically determined rates of Ag dissolution with rates recorded from solutions spiked with H2O2 indicates that dissolution occurs at a rate equivalent to a bulk solution concentration of 100 mmol dm(-3) H2O2. This suggests that a local enhancement occurs in the rate of photocatalytically induced metal dissolution on surfaces under direct illumination, which is attributed to two causes: (i) local modification of the TiO2 by deposition of dissolved Ag, so increasing its efficiency for peroxide generation; and (ii) peroxide generation local to the electrode surface mitigating against photolytic loss reactions seen to occur in the solution bulk. The photoinduced dissolution process is found to be both highly controllable/light switchable and spatially specific. (C) 2012 Elsevier B.V. All rights reserved.

AB - We present the first observation of photocatalytically driven, hydrogen peroxide mediated, dissolution of a macroscopic metal surface. Specifically, we report on the dissolution of silver in the presence of photocatalytically generated H2O2 produced by ultra-band gap illumination of TiO2 at 365 nm in the presence of O-2. Direct measurements of photocatalytically generated H2O2 in the TiO2 suspensions studied indicate that peroxide concentration never exceeds 32 mu mol dm(-3). However, comparison of electrochemical quartz crystal microgravimetrically determined rates of Ag dissolution with rates recorded from solutions spiked with H2O2 indicates that dissolution occurs at a rate equivalent to a bulk solution concentration of 100 mmol dm(-3) H2O2. This suggests that a local enhancement occurs in the rate of photocatalytically induced metal dissolution on surfaces under direct illumination, which is attributed to two causes: (i) local modification of the TiO2 by deposition of dissolved Ag, so increasing its efficiency for peroxide generation; and (ii) peroxide generation local to the electrode surface mitigating against photolytic loss reactions seen to occur in the solution bulk. The photoinduced dissolution process is found to be both highly controllable/light switchable and spatially specific. (C) 2012 Elsevier B.V. All rights reserved.

KW - OXYGEN REDUCTION

KW - TIO2 PARTICLES

KW - SEMICONDUCTOR PHOTOCATALYSIS

KW - LIGHT

KW - HYDROGEN-PEROXIDE

KW - WATER

KW - Hydrogen peroxide

KW - Quartz crystal microbalance

KW - QUARTZ-CRYSTAL MICROBALANCE

KW - PHOTOREDUCTION

KW - Corrosion

KW - Electrochemistry

KW - OXIDATION

KW - Silver

KW - TITANIUM-DIOXIDE

U2 - 10.1016/j.jphotochem.2012.09.003

DO - 10.1016/j.jphotochem.2012.09.003

M3 - Journal article

VL - 249

SP - 21

EP - 28

JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

SN - 1010-6030

ER -