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Journal articles
Improved Photocatalytic Hydrogen Evolution on Tantalate Perovskites CsTaO 3 and LiTaO 3 by Strain-Induced Vacancies
Abstract : Tantalate perovskites are potential candidates for photocatalytic hydrogen production without cocatalyst addition; however, these oxides have large bandgaps, which result in their low photocatalytic activity. In this study, to enhance the photocatalytic activity, CsTaO3 as a potential photocatalyst and LiTaO3 as a well-known photocatalyst are subjected to severe plastic strain using the high-pressure torsion (HPT) method. Both superstrained tantalates exhibit optical bandgap narrowing and ∼2.5 times enhancement of photocatalytic hydrogen production. Such bandgap narrowing is mainly due to the formation of oxygen vacancies, although nanocrystal formation and partial amorphization also occur by straining. These findings not only introduce CsTaO3 as a photocatalyst but also confirm the significance of strain-induced vacancies on the photocatalytic activity of perovskites.
Cited literature [53 references]
https://hal-normandie-univ.archives-ouvertes.fr/hal-02521071
Contributor : Xavier Sauvage <>
Submitted on : Thursday, May 7, 2020 - 10:48:42 AM
Last modification on : Thursday, May 7, 2020 - 4:32:12 PM
Contributor : Xavier Sauvage <>
Submitted on : Thursday, May 7, 2020 - 10:48:42 AM
Last modification on : Thursday, May 7, 2020 - 4:32:12 PM
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Tantalates hal acs2020.pdf
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