Photocatalytic conversion of CO into valued chemicals is limited by the CO adsorption and activation capability on catalyst surface. In this work, Sn element was successfully doped in ultrathin BiOCl with oxygen vacancies. The dipole moment of catalyst efficient increased due to the Sn doping, leading to a stronger internal electric field. In addition, the surface frustrated Lewis pairs were simultaneously constructed near the oxygen vacancies due to Sn dopant. The formed region of frustrated Lewis pairs-oxygen vacancies as active sites enable an improved CO adsorption, and the enhanced internal electric field intensity promoted the charge carrier separation and transfer, leading to the enhanced CO reduction performances. This work provides light on enhancing internal electric field by increasing dipole moment and presents feasible tunability of catalytic active sites at atom-scale, providing fundamental insights for understanding of mechanism of element doping in catalyst for improving CO photoreduction performance.

中文翻译：

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Sn掺杂剂诱导的偶极子增加协同受挫路易斯对促进超薄层状氯氧化铋用于CO2光还原

CO光催化转化为有价值的化学品受到催化剂表面CO吸附和活化能力的限制。在这项工作中，Sn元素成功地掺杂到具有氧空位的超薄BiOCl中。由于Sn掺杂，催化剂效率的偶极矩增加，导致内部电场更强。此外，由于Sn掺杂，在氧空位附近同时构建了表面受抑路易斯对。形成的受挫路易斯对-氧空位区域作为活性位点可以改善CO吸附，增强的内部电场强度促进载流子分离和转移，从而增强CO还原性能。这项工作为通过增加偶极矩增强内部电场提供了线索，并提出了原子尺度催化活性位点的可行可调性，为理解催化剂中元素掺杂的机制以提高CO光还原性能提供了基本见解。