Guilin Yin,Xiaosi Qi,Yanli Chen,Qiong Peng,Xingxing Jiang,Qinglong Wang,Wenhua Zhang,Xiu Gong
Metal halide perovskite quantum dots (QDs) are regarded as one of the promising photocatalysts for CO2 reduction because of their unique optoelectronic properties. However, severe charge recombination and insufficient CO2 absorption/activation have limited photocatalytic CO2 reduction. Herein, we report an efficient 0D/0D CsPbBr3/CdSe heterojunction consisting of CdSe QDs in situ grown on CsPbBr3 QDs for high-performance photocatalytic CO2 reduction using water as the electron donor in organic solution. The type-II 0D/0D heterojunction with the strong electronic coupling of Pb–Se and Br–Cd bonds between CdSe and CsPbBr3 facilitates fast electron transfer. Moreover, the specific abundant edge- and corner-sites of CdSe accelerate the CO generation by forming a Cd–C2O4− adduct, enabling superior CO2 activation capacity and efficient CO2 conversion into CO. Consequently, assisted by water to provide electrons and protons, the yield of main product CO reaches 115.26 μmol g−1, which is 4.6-fold higher than that of pristine CsPbBr3. This study is expected to provide a new way to fabricate high-performance perovskite-based catalysts in the field of photocatalysis.
To improve the stability and luminescence properties of CsPbBr3 QDs, we proposed a new core-shell structure for CsPbBr3/CdSe/Al quantum dots (QDs). By using a simple method of ion layer adsorption and a reaction method, CdSe and Al were respectively packaged on the surface of CsPbBr3 QDs to form the core-shell CsPbBr3/CdSe/Al QDs. After one week in a natural environment, the photoluminescence quantum yields of CsPbBr3/CdSe/Al QDs were greater than 80%, and the PL intensity remained at 71% of the original intensity. Furthermore, the CsPbBr3/CdSe/Al QDs were used as green emitters for white light-emitting diodes (LEDs), with the LEDs spectrum covering 129% of the national television system committee (NTSC) standard color gamut. The core-shell structure of QDs can effectively improve the stability of CsPbBr3 QDs, which has promising prospects in optoelectronic devices.
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