TY - JOUR
T1 - Improved Photocatalytic Hydrogen Evolution on Tantalate Perovskites CsTaO3 and LiTaO3 by Strain-Induced Vacancies
AU - Edalati, Kaveh
AU - Fujiwara, Keisuke
AU - Takechi, Shuhei
AU - Wang, Qing
AU - Arita, Makoto
AU - Watanabe, Motonori
AU - Sauvage, Xavier
AU - Ishihara, Tatsumi
AU - Horita, Zenji
N1 - Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/2/24
Y1 - 2020/2/24
N2 - 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.
AB - 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.
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U2 - 10.1021/acsaem.9b02197
DO - 10.1021/acsaem.9b02197
M3 - Article
AN - SCOPUS:85078530848
SN - 2574-0962
VL - 3
SP - 1710
EP - 1718
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 2
ER -