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Nitrogen-doped LaZrTa3O11 as a visible light-active photocatalyst for water-reduction and -oxidation reactions

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Abstract

Nitrogen doping was applied to layered compound LaZrTa3O11 (a wide bandgap semiconductor photocatalyst). Bandgap reductions >2.2 eV were achieved by this modification, which effectively red-shifted the light-absorption edge of LaZrTa3O11 from 300 nm to ∼650 nm. Nitrogen-doped LaZrTa3O11 (i.e., LaZrTa3O11−xNy) was now active for both water-reduction and -oxidation reactions under visible-light illumination (λ ≥400 nm) with good durability and stability. An apparent quantum efficiency (AQE) as high as 0.53% at 420 ± 20 nm was achieved for water-oxidation reactions. Further analyses suggested that its visible-light activity originated mainly from an uplift of the valence band edge as a result of nitrogen incorporation. This strategy to achieve visible-light activity was very inspiring and could be applicable to other layered compounds that are active only under ultraviolet-light illumination.

Graphical abstract: Nitrogen-doped LaZrTa3O11 as a visible light-active photocatalyst for water-reduction and -oxidation reactions

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Article information


Submitted
09 May 2020
Accepted
07 Jun 2020
First published
08 Jun 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

Nitrogen-doped LaZrTa3O11 as a visible light-active photocatalyst for water-reduction and -oxidation reactions

S. Wei and X. Xu, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QI00548G

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