Morphological control is generally applied as a modification strategy to promote photocatalysis via adsorption capacity enhancement. However, the intrinsic relationship between the internal electric field (IEF) intensity and morphological control is rarely researched. In this work, we found that the CO yield rate of CuS nanoflowers was 8.5 times higher than that of CuS nanoballs. The differences in photocatalytic performance were not induced by surface active sites because the surface S defect concentrations of CuS nanoballs and nanoflowers were similar, and the enhanced intrinsic built-in IEF of CuS flowers was explored as the internal cause. The theoretical calculations confirmed that IEF intensity could be efficiently strengthened due to the nanoflower structure of CuS. The improved carrier separation of CuS nanoflowers was primarily induced by the enhanced IEF, and the surface S defects capturing the dissociative electrons further intensified the carrier separation, which were determined by sufficient experiments. Moreover, the mechanism of enhanced selective CO₂ photoreduction was explored and confirmed by efficient experimental strategies and theoretical calculations. This work revealed the effect of morphological control on promoting CO₂ photoreduction via IEF intensity modulation, which provided a new perspective for photocatalysis.

中文翻译：

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通过缺硫 CuS 的形态控制调制内电场以增强选择性 CO2 光还原

形态控制通常作为一种修饰策略，通过增强吸附能力来促进光催化。然而，内电场（IEF）强度与形态控制之间的内在关系却很少被研究。在这项工作中，我们发现CuS纳米花的CO产率是CuS纳米球的8.5倍。光催化性能的差异不是由表面活性位点引起的，因为CuS纳米球和纳米花的表面S缺陷浓度相似，并且CuS花的增强的内在内置IEF被探索为内部原因。理论计算证实，由于 CuS 的纳米花结构，可以有效增强 IEF 强度。CuS纳米花的载流子分离改善主要是由增强的IEF引起的，并且表面S缺陷捕获离解电子进一步加剧了载流子分离，这是通过足够的实验确定的。此外，通过有效的实验策略和理论计算，探索并证实了增强选择性CO ₂光还原的机制。_{该工作揭示了通过IEF强度调制形态控制促进CO 2}光还原的作用，为光催化提供了新的视角。