La/Zr co-doped SrTaO₂N has been investigated as visible-light-active photocatalysts for water reduction. Unlike previous aliovalent doping that leads to a decrease in light absorption, La/Zr co-doping largely preserves the visible light absorption of SrTaO₂N. More importantly, the La/Zr co-doping not only helps to improve surface hydrophilicity and reduce particle sizes but also effectively inhibits defect formation (e.g. Ta⁴⁺) in SrTaO₂N. These modifications are responsible for significant enhancements in photocatalytic H₂ production. AQE as high as 0.84% was achieved at 420 ± 20 nm for Sr_0.4La_0.6Ta_0.4Zr_0.6O₂N (x = 0.6), which also showed good durability and stability. Further analysis suggests that La/Zr co-doping negatively shifts the conduction band edge positions of SrTaO₂N and contributes to better charge separation conditions.

中文翻译：

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La / Zr共掺杂的SrTaO2N作为有前途的光催化剂，可在可见光照射下还原水

已经研究了La / Zr共掺杂SrTaO ₂ N作为用于减水的可见光活性光催化剂。La / Zr共掺杂与先前的铝价掺杂会导致光吸收降低不同，它在很大程度上保留了SrTaO ₂ N的可见光吸收。更重要的是，La / Zr共掺杂不仅有助于改善表面亲水性并减少颗粒尺寸，但也有效地抑制了SrTaO ₂ N中缺陷的形成（例如Ta ⁴⁺）。这些修饰可显着提高光催化H _2的产生。对于Sr _0.4 La _0.6 Ta _0.4 Zr在420±20 nm处达到的AQE高达0.84％_0.6 O ₂ N（ x = 0.6），这也显示出良好的耐久性和稳定性。进一步的分析表明，La / Zr共掺杂使SrTaO ₂ N的导带边缘位置发生负向偏移，并有助于改善电荷分离条件。