Photocatalytic activity of Sn₂M₂O₇ (M=Nb and Ta) pyrochlore oxides with blue LEDs irradiation

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  • Photocatalytic activity of Sn<sub>2</sub><i>M</i><sub>2</sub>O<sub>7</sub> (<i>M</i> = Nb and Ta) pyrochlore oxides with blue LEDs irradiation

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In this study, we have investigated the photocatalytic properties for pyrochlore-type oxides Sn2M2O7 (M = Nb and Ta) and their solid solutions. Although the volume of evolved H2 is very low, Pt-loaded Sn2Nb2O7 and Sn2Ta2O7 showed photocatalytic activity for H2 evolution from water under blue LEDs irradiation. The absorption edge of the Sn2NbxTa2−xO7 solid solutions was in a position between those of Sn2Nb2O7 and Sn2Ta2O7, and the band gap became narrow monotonically as the value of x increased. Although some variability was observed, there was not the clear dependence on the composition value of x.

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