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• W2904298613 startingPage "94" @default.
• W2904298613 abstract "We here dope KTaO3 with La through a solid-state route, resulting in enhanced photocatalytic activity for the mineralization of p-nitrophenol under UV light. We suggest simultaneous substitution of K and Ta by La, leading to lattice expansion and surface nanosteps. With increasing the La concentration, the conduction band edge is raised, while the valence band remains unchanged. As a result, the band gap increases. The raised conduction band edge is proposed to be the key behind the enhanced photocatalytic activity since it results in an increased reduction power of photoproduced electrons. The raised conduction band edge is also an indication of the substitution of Ta, which mainly makes up the conduction band, by La. Furthermore, X-ray photoelectron spectroscopy and X-ray absorption near edge structure confirm the oxidation state of La residing on the surface and in the bulk to be +3, as anticipated. Extended X-ray absorption fine structure then confirms that increasing the La concentration slightly increases the length and the coordination number of La-O bond in the here prepared La-doped KTaO3. The increased bond length is due to the expanded lattice, while the increased coordination number is due to the increased numbers, and hence the contributions, of La-O pairs." @default.
• W2904298613 created "2018-12-22" @default.
• W2904298613 creator A5065323250 @default.
• W2904298613 creator A5085869032 @default.
• W2904298613 creator A5088175523 @default.
• W2904298613 date "2019-04-01" @default.
• W2904298613 modified "2023-09-26" @default.
• W2904298613 title "Chemical state and coordination structure of La cations doped in KTaO3 photocatalysts" @default.
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• W2904298613 doi "https://doi.org/10.1016/j.jpcs.2018.12.010" @default.
• W2904298613 hasPublicationYear "2019" @default.
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