Perovskite oxides and their derivative photocatalysts are promising candidates for highly efficient solar energy conversion and environmental remediation. Herein, we proposed a non-integer induced spontaneous polarization of highly efficient perovskite-based NBTO SCN photocatalysts. The experimental and theoretical results demonstrate that the Na_0.5Bi_2.5Ta₂O₉ single-crystal nanoplates (NBTO SCNs) with exposed {001} facets show more superior photocatalytic efficiency in hydrogen evolution and pollutant degradation than conventional integer NaTaO₃ and BiTaO₄. The non-integer structure (mixed A-site cations Na⁺ or Bi³⁺) of NBTO SCNs possesses giant spontaneous polarization along the c-axis. Therefore, the generated carriers can easily diffuse along the polarization direction to the opposite surfaces of catalysts, and thus significantly increase the photocatalytic activities of NBTO SCNs.

中文翻译：

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高效钙钛矿基NBTO SCN光催化剂的非整数自发极化

钙钛矿氧化物及其衍生物光催化剂是高效太阳能转化和环境修复的有前途的候选者。在这里，我们提出了一种非整数诱导的高效钙钛矿基NBTO SCN光催化剂的自发极化。实验和理论结果表明，具有暴露的{001}面的Na _0.5 Bi _2.5 Ta ₂ O ₉单晶纳米板（NBTO SCNs）在制氢和污染物降解方面比常规的整数NaTaO ₃和BiTaO ₄表现出更优异的光催化效率。非整数结构（混合的A位阳离子Na ⁺或Bi ³⁺）NBTO SCN沿c轴具有巨大的自发极化。因此，产生的载流子可以容易地沿极化方向扩散到催化剂的相对表面，从而显着提高了NBTO SCN的光催化活性。