Elemental doping confined in atomically-thin 2D semiconductors offers a compelling strategy for con-structing high performance photocatalysts.Although impressive progress has been achieved based on co-thermolysis method,the choices of dopants as well as semiconductor hosts are still quite limited to yield the elaborate photocatalyst with atomic-layer-confined doping defects,owing to the difficulty in balancing the reaction kinetics of different precursors.This study shows that the cation exchange re-action,which is dictated by the Pearson's hard and soft acids and bases(HSAB)theory and allowed to proceed at mild temperatures,can be developed into a conceptually new protocol for engineering el-emental doping confined in semiconductor atomic layers.To this aim,the two atomic layers of a new type of 2D photocatalyst PdSeO3(PdSeO3 2ALs,1.1 nm)are created by liquid exfoliation and exploited as a proof-of-concept prototype.It is demonstrated that the Mn(Ⅱ)dopants with controlled concentra-tions can be incorporated into PdSeO3 2ALs via topological Mn2+-for-Pd2+cation exchange performed in water/isopropanol solution at 30℃.The resulting Mn-doped PdSeO3 2ALs present enhanced capacity for driving photocatalytic oxidation reactions in comparison with their undoped counterparts.The findings here suggest that the new route mediated by post synthetic cation exchange promises to give access to manifold 2D confined-doping photocatalysts,with little perturbations on the thickness,morphology,and crystal structure of the atomically-thin semiconductor hosts.

Xiuming Zhang;Rongrong Pan;Tailei Hou;Shuping Zhang;Xiaodong Wan;Yuemei Li;Shan Liu;Jia Liu;Jiatao Zhang

Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications,Experimental Center of Advanced Materials,School of Materials Science&Engineering,Beijing Institute of Technology,Beijing 100081,China

中国化学快报（英文版）

[1]Xiuming Zhang;Rongrong Pan;Tailei Hou;Shuping Zhang;Xiaodong Wan;Yuemei Li;Shan Liu;Jia Liu;Jiatao Zhang-.Doping transition metal in PdSeO3 atomic layers by aqueous cation exchange:A new doping protocol for a new 2D photocatalyst)[J].中国化学快报（英文版）,2022(08):3739-3744

PdSeO3,HSAB,emental,2ALs,Pd2+cation

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