Excellent optical properties involving strong visible light response and superior carrier transport endow metal halide perovskites(MHP)with a fascinating prospect in the field of photocatalysis.Nevertheless,the poor s...Excellent optical properties involving strong visible light response and superior carrier transport endow metal halide perovskites(MHP)with a fascinating prospect in the field of photocatalysis.Nevertheless,the poor stability of MHP nanocrystals(NCs)in water-contained system,especially without the protection of long alkyl chain ligands,severely restricts their photocatalytic performance.In this context,we report an effortless strategy for the generation of ligand-free MHP NCs based photocatalyst with high water tolerance,by coating PbI_(2)on the surface of ligand-free formamidinium lead bromide(FAPb Br_(3))NCs via the facile procedure of in-situ conversion with the aid of ZnI_(2).Under the protection of PbI_(2)layer,the resultant FAPb Br_(3)/PbI_(2)composite exhibits significantly ameliorated stability in an artificial photosynthesis system with CO_(2)and H_(2)O vapor as feedstocks.Moreover,the formation of compact PbI_(2)layer can accelerate the separation of photogenerated carriers in FAPbBr_(3)NCs,bringing forth a remarkable improvement of CO_(2)photoreduction efficiency with an impressive electron consumption yield of 2053μmol/g in the absence of organic sacrificial agents,which is 7-fold over that of pristine FAPb Br_(3)NCs.展开更多
基金the Natural Science Foundation of Tianjin City(No.17JCJQJC43800)。
文摘Excellent optical properties involving strong visible light response and superior carrier transport endow metal halide perovskites(MHP)with a fascinating prospect in the field of photocatalysis.Nevertheless,the poor stability of MHP nanocrystals(NCs)in water-contained system,especially without the protection of long alkyl chain ligands,severely restricts their photocatalytic performance.In this context,we report an effortless strategy for the generation of ligand-free MHP NCs based photocatalyst with high water tolerance,by coating PbI_(2)on the surface of ligand-free formamidinium lead bromide(FAPb Br_(3))NCs via the facile procedure of in-situ conversion with the aid of ZnI_(2).Under the protection of PbI_(2)layer,the resultant FAPb Br_(3)/PbI_(2)composite exhibits significantly ameliorated stability in an artificial photosynthesis system with CO_(2)and H_(2)O vapor as feedstocks.Moreover,the formation of compact PbI_(2)layer can accelerate the separation of photogenerated carriers in FAPbBr_(3)NCs,bringing forth a remarkable improvement of CO_(2)photoreduction efficiency with an impressive electron consumption yield of 2053μmol/g in the absence of organic sacrificial agents,which is 7-fold over that of pristine FAPb Br_(3)NCs.
