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[资源] 华中师大张礼知教授最新BiOCl力作：基于晶面角度来探讨掺杂过程

Advanced Functional Materials在2月26号上线了一篇名为“Facet-Level Mechanistic Insights into General Homogeneous Carbon Doping for Enhanced Solar-to-Hydrogen Conversion”的文章，由华中师范大学张礼知教授和余颖老师共同出品。该文章13页，以暴露001和010晶面的BiOCl为模型，系统的阐述了碳元素在均相掺杂中的迁移过程（从葡萄糖中的碳原子到浅晶格中植入的含碳类物质，再到晶格中的碳掺杂剂），并且确认了影响这一过程的两个关键因素：表面原子结构（影响含碳类物质在浅晶格中的植入和吸附模式）和内部原子排列结构（决定碳掺杂剂在晶格内部的扩散速度）。
Homogeneous doping can boost solar-to-hydrogen conversion and therefore attracts great attention. Although a great deal of effort has been made to explore the doping–photoreactivity relationship, the doping mechanisms, especially from the perspective of crystal facets, are seldom explored. In this study, a general homogeneous carbon doping strategy is established and then serves as the doping model for a mechanistic investigation, as encouraged by its versatility in enabling homogeneous incorporation of carbon and improving solar-to-hydrogen conversion for typical oxides including TiO2, ZnO, and BiOCl. Using well-defined BiOCl nanosheets of high {001} or {010} facet exposure, we clarify the homogeneous carbon doping mechanism at the level of crystal facets for the first time. This mechanism involves the initial facet-dependent adsorption of the dopant precursor, regulated by the surface atomic structures, and the subsequent facet-dependent diffusion of carbon dopants associated with the facet-related arrangements of bulk atoms. This results in facet-dependent carbon doping behavior and a dopant-concentration-dependent solar-to-hydrogen conversion property of BiOCl nanosheets. These mechanistic insights also suggest that the implantation of the dopant precursor in the shallow lattice of host nanocrystal is vital for the effective homogeneous doping. This new doping model is different from the conventional counterpart based on the organic ligands or gas molecules adsorption onto the surface of host nanocrystals, where surface doping usually occurs.

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