Liquid vertical bar liquid ion-transfer processes at the dioctylphosphoric acid (N,N-didodecyl-N ',N '-diethylphenylenediamine)vertical bar water (electrolyte) interface at graphite and mesoporous TiO2 substrates

Stott, Susan J., McKenzie, Katy J., Mortimer, Roger J., Hayman, Colin M., Buckley, Benjamin R., Bulman Page, Philip C., Marken, Frank, Shul, Galyna and Opallo, Marcin (2004) Liquid vertical bar liquid ion-transfer processes at the dioctylphosphoric acid (N,N-didodecyl-N ',N '-diethylphenylenediamine)vertical bar water (electrolyte) interface at graphite and mesoporous TiO2 substrates. Analytical Chemistry, 76 (18). pp. 5364-5369. ISSN 0003-2700

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Abstract

Biphasic electrode systems are studied for the case of the oxidation of the water-insoluble liquid N,N-didodecyl-N',N',-diethylphenylenediamine (DDPD) neat and dissolved in bis(2-ethylhexyl) phosphate (HDOP) and immersed in aqueous electrolyte media. The oxidation process in the absence of HDOP is accompanied by transfer of the anion (perchlorate or phosphate) from the water into the organic phase. However, in the presence of HDOP, oxidation is accompanied by proton exchange instead. Ibis electrochemically driven proton exchange process occurs over a wide pH range. Organic microdroplet deposits of DDPD in HDOP at basal plane pyrolytic graphite electrodes are studied by voltammetric techniques and compared in their behavior to organic microphase deposits in mesoporous TiO2 thin films. The mesoporous TiO2 thin film acts as a host for the organic liquid and provides an alternative biphasic electrode system compared to the random microdroplet/graphite system. Two types of mesoporous TiO2 thin-film electrodes, (i) a 300-400-nm film on ITO and (ii) a 300-400-nm film on ITO sputter-coated with a 20-nm porous gold layer, are investigated.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Rachel Smith
Date Deposited: 21 Jun 2011 09:39
Last Modified: 21 Apr 2020 20:24
URI: https://ueaeprints.uea.ac.uk/id/eprint/32860
DOI: 10.1021/ac049317y

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