Abstract
The photoelectrochemical properties of perovskite Ba2SnO4 were studied for the first time. This material has direct optical transitions with energy 3.18 eV due to electron transfer O2–2p → Sn4+5 s. The Mott–Schottky plots obtained in acidic media (pH ≈ 2.5) indicate that this material has n-type conductivity and electron density 1.14∙1017 cm–3. The conduction band potential of Ba2SnO4 (-0.86 VSCE) is located in a more negative region than the reduction potential of HCrO4 -, which permits reduction of this anion to Cr3+ upon the action of UV light. The photoreduction is described in the framework of the Langmuir_Hinshelwood model by a pseudo-first-order kinetic equation. Irradiation of reaction mixtures by sunlight for ~2 h leads to the conversion of 73% (50 ppm) chromate anions with 0.13% quantum yield.
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