Critical factors for photoelectrochemical and photocatalytic H2 evolution from gray anatase (001) nanosheets

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F22%3A73618706" target="_blank" >RIV/61989592:15640/22:73618706 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/2515-7655/ac8ed3" target="_blank" >https://iopscience.iop.org/article/10.1088/2515-7655/ac8ed3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/2515-7655/ac8ed3" target="_blank" >10.1088/2515-7655/ac8ed3</a>

Result language
angličtina
Original language name
Critical factors for photoelectrochemical and photocatalytic H2 evolution from gray anatase (001) nanosheets
Original language description
In recent years, the defect engineering of titania via reduction treatments has shown a high potential for enabling efficient and co-catalyst-free photocatalytic H2 generation from methanol/water solutions. However, defect engineering simultaneously alters several properties of TiO2. Here, we use pristine (white) and hydrogenated (gray) anatase nanosheets with dominant (001) facets. By comparing electrical conductivity, photocurrent spectra, transient photocurrent response, and photocatalytic H2 evolution, we show that the increased conductivity or broad visible light absorption of gray titania is not responsible for its increased activity. Instead, the true bottleneck is the hole transfer rate that is significantly accelerated while using gray instead of white modification. Moreover, the hole transfer reaction causes the accumulation of the reaction products in pure water, hindering the photocatalytic H2 evolution over time. These combined factors explain the superior performance of gray titania over white titania in photoelectrochemical or photocatalytic water splitting.
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
21002 - Nano-processes (applications on nano-scale); (biomaterials to be 2.9)

Project
<a href="/en/project/EF15_003%2F0000416" target="_blank" >EF15_003/0000416: Advanced Hybrid Nanostructures for Renewable Energy Applications</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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