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

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Nitrogen-doped LaZrTa3O11 as a visible light-active photocatalyst for water-reduction and -oxidation reactions
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-06-08 , DOI: 10.1039/d0qi00548g
Shunhang Wei _{1,

2,

3,

4,

5} , Xiaoxiang Xu _{1,

2,

3,

4,

5}

Affiliation

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., LaZrTa₃O_11−xN_y) 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.

中文翻译：

氮掺杂LaZrTa3O11作为可见光活性光催化剂，用于水的还原和氧化反应

对层状化合物LaZrTa ₃ O ₁₁（宽带隙半导体光催化剂）进行氮掺杂。通过这种修改，带隙减小> 2.2 eV，有效地将LaZrTa ₃ O ₁₁的光吸收边缘从300 nm红移到650 nm。掺氮的LaZrTa ₃ O ₁₁（即LaZrTa ₃ O _{11- x} N _y）现在在可见光照射下对水的还原和氧化反应均具有活性（λ≥400nm）具有良好的耐久性和稳定性。对于水氧化反应，在420±20 nm处的表观量子效率（AQE）高达0.53％。进一步的分析表明，它的可见光活性主要来自于氮结合导致价带边缘的升高。这种实现可见光活性的策略非常鼓舞人心，可以应用于仅在紫外线照射下才具有活性的其他层状化合物。

更新日期：2020-07-14

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