Bromine generation on various photoanodes: α-Fe2O3, Fe2TiO5, WO3 and TiO2

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F24%3A43928124" target="_blank" >RIV/60461373:22310/24:43928124 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0920586124001214?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0920586124001214?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cattod.2024.114627" target="_blank" >10.1016/j.cattod.2024.114627</a>

Result language
angličtina
Original language name
Bromine generation on various photoanodes: α-Fe2O3, Fe2TiO5, WO3 and TiO2
Original language description
The competitive photoelectrochemical reactions bromide vs. water (photo)oxidation in an acidic medium (pH = 1.7) were studied on four semiconducting oxides viz. hematite (α-Fe2O3), pseudobrookite (Fe2TiO5), tungsten trioxide (WO3) and titanium dioxide (TiO2). The experiments were carried out with thin film electrodes on conductive substrates (FTO/glass) in a vigorously stirred batch reactor under AM1.5 irradiation. Electrical bias was applied to the electrodes, exclusively promoting valence band processes that lead to the oxidative pathways. The initial Faradaic efficiency (FE0) for bromine generation was determined by chemical analysis (UV-Vis absorbance) of the electrolytes.The semiconducting materials used as photoanodes showed a similar ability to oxidize bromide to bromine. For 0.02 M sodium bromide, a Faradaic efficiency of 100 % was obtained for α-Fe2O3, WO3 and TiO2, while the highest value for pseudobrookite was 90 %.From further analysis, as to competition kinetics, the ratio of the rate constants of water oxidation and bromide oxidation, vH2O / kox, was estimated. α-Fe2O3 was the most successful compound among the studied semiconductors.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project
<a href="/en/project/GA23-05266S" target="_blank" >GA23-05266S: Study of key factors influencing the efficiency of photoelectrochemical cells using sunlight for synthesis reactions and water purification</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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