Separate monitoring of reaction products formed at oxidation and reduction sites of TiO2 photocatalysts using a microelectrode
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Photoelectrolysis of TiO<inf>2</inf> is highly localized and the selectivity is affected by the light
2022, Chemical Engineering JournalCitation Excerpt :These works show that SPECM is a powerful tool for collecting quantitative and qualitative information about photochemical reactions. The SPECM investigations of the reactivity of the TiO2 showed a localized electrochemical and photoelectrochemical activity [29–33]. Besides the knowledge about active sides for electrolysis reactions, it is a fundamental problem to understand the selectivity involving competing reactions.
Combined local anodization of titanium and scanning photoelectrochemical mapping of TiO<inf>2</inf> spot arrays
2016, Electrochimica ActaCitation Excerpt :Kemp et al. used a silver disk UME and an external UV source to investigate the photomineralisation of 2,4-dichlorophenol at a classic TiO2 surface [43]. In their work Sakai et al. used a carbon disk UME and an external UV source to investigate chloride oxidation at a classic TiO2 surface [44]. The same configuration was used by Simpson et al. to quantify the photogenerated adsorbed intermediates during the photo-assisted water oxidation reaction on lightly n-doped SrTiO3 [17].
A photo-(electro)-catalytic system illustrating the effect of lithium ions on titania surface energetics and charge transfer
2015, Journal of Electroanalytical ChemistryCitation Excerpt :We remark that when photo-accumulation of electrons was carried out at open circuit, surface charge recombination in the illuminated areas [14] cannot be a priori excluded although it can be limited by efficient scavenging of holes by 2-propanol. In fact, previous reports have clearly demonstrated the low efficiency of photocatalytic systems compared, for example, with analogous photo-electrochemical ones where an applied potential can further reduce recombination phenomena [9,59]. In order to increase our level of understanding of reactions induced by UV illumination, we thought it would be informative to compare the results with those obtained in tests in which the oxide is charged electrochemically in the dark.
TiO<inf>2</inf> photocatalysis and related surface phenomena
2008, Surface Science ReportsCitation Excerpt :For the moment, we are also ignoring the fact that there is actually some transient cathodic current as one sweeps the potential in the negative direction [204], which could be due to the intercalation of protons into the TiO2 structure (see later). A series of papers were published in which a microelectrode was placed at various distances above an illuminated anatase film, which was deposited on an indium–tin oxide (ITO) substrate [228–233]. Measurements that were carried out with the microelectrode technique showed that, even when an anatase film is actively oxidizing an electron donor (in this case, ferrocyanide) and even while there is oxygen reduction occurring at a bare section of the ITO substrate, there is still a quite significant reduction current passing at the anatase surface (Fig. 4.3) [232].
Titanium dioxide photocatalysis
2000, Journal of Photochemistry and Photobiology C: Photochemistry ReviewsComparative studies on the photocatalytic decomposition of ethanol and acetaldehyde in water containing dissolved oxygen using a microelectrode technique
1997, Journal of Electroanalytical Chemistry