Conduction Band Control of Oxyhalides with a Triple-Fluorite Layer for Visible Light Photocatalysis
- 8 January 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 143 (6), 2491-2499
- https://doi.org/10.1021/jacs.0c10288
Abstract
The discovery of building blocks offers new opportunities to develop and control properties of extended solids. Compounds with fluorite-type Bi2O2 blocks host various properties including lead-free ferroelectrics and photocatalysts. In this study, we show that triple-layered Bi2MO4 blocks (M = Bi, La, Y) in Bi2MO4Cl allow, unlike double-layered Bi2O2 blocks, to extensively control the conduction band. Depending on M, the Bi2MO4 block is truncated by Bi–O bond breaking, resulting in a series of n-zigzag chain structures (n = 1, 2, ∞ for M = Bi, La, Y, respectively). Thus, formed chain structures are responsible for the variation in the conduction band minimum (−0.36 to −0.94 V vs SHE), which is correlated to the presence or absence of mirror symmetry at Bi. Bi2YO4Cl shows higher photoconductivity than the most efficient Bi2O2-based photocatalyst with promising visible-light photocatalytic activity for water splitting. This study expands the possibilities of thickening (2D to 3D) and cutting (2D to 1D) fluorite-based blocks toward desired photocatalysis and other functions.Keywords
Funding Information
- Core Research for Evolutional Science and Technology (JPMJCR1421)
- Japan Society for the Promotion of Science (16K21724, JP15H03849, JP16H06438, JP16H06439-41, JP16H6439, JP17H06439, JP18K05296, JP20H00398, JP20H05113, JPJSCCA20200004)
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