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Crystal Size Dependence of the Photo-Electrochemical Water Oxidation on Nanoparticulate CaTiO3
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SYSNO ASEP 0566049 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Crystal Size Dependence of the Photo-Electrochemical Water Oxidation on Nanoparticulate CaTiO3 Author(s) Klusáčková, Monika (UFCH-W) RID, ORCID
Nebel, Roman (UFCH-W) RID, ORCID
Minhová Macounová, Kateřina (UFCH-W) RID, ORCID
Krtil, Petr (UFCH-W) RID, ORCIDSource Title Electrocatalysis . - : Springer - ISSN 1868-2529
Roč. 14, č. 3 (2023), s. 353-364Number of pages 12 s. Language eng - English Country US - United States Keywords Calcium titanate ; Ozone formation ; Photo-electrochemistry ; Spray-freezing/freeze-drying synthesis ; Water oxidation Subject RIV CG - Electrochemistry OECD category Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) R&D Projects LM2018124 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFCH-W - RVO:61388955 UT WOS 000900161700001 EID SCOPUS 85144176813 DOI 10.1007/s12678-022-00801-y Annotation Nanocrystalline CaTiO3 materials with controlled particle size were prepared using spray-freezing/freeze-drying approach utilizing gelatine as a structure-directing agent. The resulting materials show characteristic particle size between 19 and 60 nm. The shape of the nanocrystals changes from cube-like single crystal containing particles into less regular isometric particles. Prepared materials as identified by X-ray diffraction analysis are formed by orthorhombic perovskite with small admixture of cubic phase. The ratio of both perovskite phases is independent of the particle size or prevailing crystal shape. All prepared materials show n-semiconducting character with band gap of ca 3.6 eV. They also show photo-electrochemical activity in water oxidation in acid media if a bias greater than 400 mV with respect to the flat band potential is applied. The specific photo-electrochemical activity decreases with increasing specific surface area. This behavior is attributed to increased probability of the electron transfer at the illuminated CaTiO3 surface facilitated by the surface states. The CaTiO3 materials also generate significant amount of ozone upon illumination in oxygen saturated solutions. The tendency to form ozone increases with increasing particle size suggesting that the ozone formation is hindered on materials with large number of low dimensionality states (crystal edges and vertices). Graphical Abstract: [Figure not available: see fulltext.]. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2024 Electronic address https://hdl.handle.net/11104/0337487
Number of the records: 1