Quinazoline derivatives were synthesized fromα-iminoesters via a cascade imino-Diels-Alder and then oxidation reaction catalyzed with CuBr_2.This method provided a new strategy for preparing quinazoline derivatives w...Quinazoline derivatives were synthesized fromα-iminoesters via a cascade imino-Diels-Alder and then oxidation reaction catalyzed with CuBr_2.This method provided a new strategy for preparing quinazoline derivatives which may be useful in the synthesis of heterocyclic intermediates.展开更多
Heterojunction engineering is recognized as a promising strategy to modulate the photocatalytic properties of semiconductors.Herein,lead-free Cs_(2)CuBr_(4)perovskite quantum dots(PQDs)were confined in a mesoporous Cu...Heterojunction engineering is recognized as a promising strategy to modulate the photocatalytic properties of semiconductors.Herein,lead-free Cs_(2)CuBr_(4)perovskite quantum dots(PQDs)were confined in a mesoporous CuO framework and a p-n type S-scheme heterojunction of Cs_(2)CuBr_(4)/CuO(CCB/CuO)photocatalyst was fabricated.Experimental characterizations confirmed the effective confinement of the Cs_(2)CuBr_(4)PQDs in the mesoporous CuO framework,which enabled intimate contact in the interface of CCB/CuO heterojunction,thus facilitating the interfacial charge migration and separation between p-type CuO and n-type Cs_(2)CuBr_(4).Owing to the outstanding charge transport property and CO_(2)adsorption capacity,the developed CCB/CuO heterojunction exhibited remarkably enhanced photocatalytic CO_(2)conversion efficiency with an electron consumption rate(R_(electron))of 281.1μmol g^(-1)h^(-1),which was approximately2.8 times higher than that of pristine Cs_(2)CuBr_(4).These findings provide some insights into the rational engineering design of lead-free perovskite-based heterostructures for efficient photocatalytic CO_(2)conversion.展开更多
Heterojunction construction,especially S-scheme heterojunction,represents an efficient universal strategy to achieve high-performance photocatalytic materials.For further performance stimulation of these well-designed...Heterojunction construction,especially S-scheme heterojunction,represents an efficient universal strategy to achieve high-performance photocatalytic materials.For further performance stimulation of these well-designed heterojunctions,modulating the interfacial internal electric field(IEF)to steer dynamic charge transfer represents a promising approach.Herein,we realized the precise regulation of Fermi level(E_(F))of the oxidation semiconductor(mesoporous WO_(3-x))by tailoring the concentration of oxygen vacancies(V_(O)),maximizing the IEF intensity in Cs_(2)CuBr_(4)@WO_(3-x)(CCB@WO_(3-x))S-scheme heterojunction.The augmented IEF affords a robust driving force for directional electron delivery,leading to boosted charge separation.Hence,the developed CCB@WO_(3-x)S-scheme heterojunction demonstrated outstanding photocatalytic CO_(2)reduction performance,with the electron consumption rate(Relectron)up to 390.34μmol g^(-1)h^(-1),which is 3.28 folds higher than that of pure CCB.An in-depth analysis of the S-scheme electron transfer mode was presented via theoretical investigations,electron spin resonance(ESR),photo-irradiated Kelvin probe force microscopy(KPFM),and in-situ X-ray photoelectron spectroscopy(XPS).Finally,the CO_(2)photoconversion route was explored in detail using in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)and DFT theoretical calculations.展开更多
基金the financial support from National Natural Science Foundation of China(No.20972198).
文摘Quinazoline derivatives were synthesized fromα-iminoesters via a cascade imino-Diels-Alder and then oxidation reaction catalyzed with CuBr_2.This method provided a new strategy for preparing quinazoline derivatives which may be useful in the synthesis of heterocyclic intermediates.
基金financially supported by Natural Science Foundation of Shanghai(No.22ZR1460700)Shanghai Institute of Technology(No.XTCX2022-28)。
文摘Heterojunction engineering is recognized as a promising strategy to modulate the photocatalytic properties of semiconductors.Herein,lead-free Cs_(2)CuBr_(4)perovskite quantum dots(PQDs)were confined in a mesoporous CuO framework and a p-n type S-scheme heterojunction of Cs_(2)CuBr_(4)/CuO(CCB/CuO)photocatalyst was fabricated.Experimental characterizations confirmed the effective confinement of the Cs_(2)CuBr_(4)PQDs in the mesoporous CuO framework,which enabled intimate contact in the interface of CCB/CuO heterojunction,thus facilitating the interfacial charge migration and separation between p-type CuO and n-type Cs_(2)CuBr_(4).Owing to the outstanding charge transport property and CO_(2)adsorption capacity,the developed CCB/CuO heterojunction exhibited remarkably enhanced photocatalytic CO_(2)conversion efficiency with an electron consumption rate(R_(electron))of 281.1μmol g^(-1)h^(-1),which was approximately2.8 times higher than that of pristine Cs_(2)CuBr_(4).These findings provide some insights into the rational engineering design of lead-free perovskite-based heterostructures for efficient photocatalytic CO_(2)conversion.
基金This work was financially supported by the National Natural Science Foundation of China(51972213)Natural Science Foundation of Shanghai(22ZR1460700).
文摘Heterojunction construction,especially S-scheme heterojunction,represents an efficient universal strategy to achieve high-performance photocatalytic materials.For further performance stimulation of these well-designed heterojunctions,modulating the interfacial internal electric field(IEF)to steer dynamic charge transfer represents a promising approach.Herein,we realized the precise regulation of Fermi level(E_(F))of the oxidation semiconductor(mesoporous WO_(3-x))by tailoring the concentration of oxygen vacancies(V_(O)),maximizing the IEF intensity in Cs_(2)CuBr_(4)@WO_(3-x)(CCB@WO_(3-x))S-scheme heterojunction.The augmented IEF affords a robust driving force for directional electron delivery,leading to boosted charge separation.Hence,the developed CCB@WO_(3-x)S-scheme heterojunction demonstrated outstanding photocatalytic CO_(2)reduction performance,with the electron consumption rate(Relectron)up to 390.34μmol g^(-1)h^(-1),which is 3.28 folds higher than that of pure CCB.An in-depth analysis of the S-scheme electron transfer mode was presented via theoretical investigations,electron spin resonance(ESR),photo-irradiated Kelvin probe force microscopy(KPFM),and in-situ X-ray photoelectron spectroscopy(XPS).Finally,the CO_(2)photoconversion route was explored in detail using in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)and DFT theoretical calculations.
