Selectivity of Photoelectrochemical Water Splitting on TiO <inf>2</inf> Anatase Single Crystals

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00504553" target="_blank" >RIV/61388955:_____/19:00504553 - isvavai.cz</a>
Result on the web
<a href="http://hdl.handle.net/11104/0296232" target="_blank" >http://hdl.handle.net/11104/0296232</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jpcc.8b11730" target="_blank" >10.1021/acs.jpcc.8b11730</a>

Result language
angličtina
Original language name
Selectivity of Photoelectrochemical Water Splitting on TiO <inf>2</inf> Anatase Single Crystals
Original language description
The photoelectrochemical behaviors of (101)- and (100)-oriented anatase single crystals were compared in water oxidation in acidic as well as alkaline solutions. Both crystallographic orientations show comparable flat-band potential close to0.1 V versus reversible hydrogen electrode. The activity of anatase single crystals in water oxidation (at constant bias) decreases with increasing pH. This activity drop demonstrates shift of the photocurrent onset potential in regions close to the point of zero charge. This trend is ascribed to the gradual deprotonation of the surface OH groups and resulting negative surface charge. The activity is further affected by the cations forming the supporting electrolyte in particular, by their structure-making/breaking abilities. The apparent suppression of the photoelectrochemical water oxidation in alkaline media can be lifted in the presence on oxygen, which shifts the selectivity of the process toward ozone formation. This trend is more pronounced for (101)- than for (100)-oriented anatase, which reflects the role of surface orientation in selectivity control.
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
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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