Designing and fabricating highly efficient photocatalysts for water splitting is a promising strategy to address energy and environmental issues.Cadmium sulfide(CdS)has received significant interest as a photocatalyst...Designing and fabricating highly efficient photocatalysts for water splitting is a promising strategy to address energy and environmental issues.Cadmium sulfide(CdS)has received significant interest as a photocatalyst for visible‐light‐induced hydrogen(H2)generation.However,the severe photocorrosion,high overpotential,rapid charge recombination,and sluggish surface reaction kinetics drastically hinder its practical application in water splitting.Herein,uniform zinc cadmium sulfide(Zn_(0.5)Cd_(0.5)S)nanoparticles were anchored on ultrathin Ni(OH)_(2)nanosheets via a facile solution‐phase approach to form an intimate two‐dimensional(2D)/zero‐dimensional(0D)heterojunction.Under visible light irradiation,the 7%Ni(OH)_(2)/Zn_(0.5)Cd_(0.5)S composite exhibited the highest H2 production rate of 6.87 mmol·h^(–1)·g^(–1)with an apparent quantum yield of 16.8%at 420 nm,which is almost 43 times higher than that of pristine Zn_(0.5)Cd_(0.5)S and considerably higher than that of the Pt/Zn_(0.5)Cd_(0.5)S photocatalyst.The high photoactivity of the 2D/0D Ni(OH)_(2)/Zn_(0.5)Cd_(0.5)S heterojunction can be ascribed to its unique and robust structure,wherein the ultrathin Ni(OH)_(2)nanosheets not only provide an excellent platform for the incorporation of Zn_(0.5)Cd_(0.5)S nanoparticles but also serve as an effective cocatalyst to promote photoinduced electron transfer and offer more active sites for photocatalytic H_(2) generation.This work paves the way toward the development of versatile,low‐cost,and highly efficient 2D/0D heterojunction photocatalysts for solar energy conversion.展开更多
Carbon dots(C-Dots)have received much attention in photocatalyst design and mechanism studies due to their precise size control,unique photoelectrical properties,and abundant surface-active sites,but their catalytic p...Carbon dots(C-Dots)have received much attention in photocatalyst design and mechanism studies due to their precise size control,unique photoelectrical properties,and abundant surface-active sites,but their catalytic performance is still limited by issues such as severe charge recombination,agglomeration,and poor stability,which mainly stem from the small size and high surface area.A major solution to these problems is loading the zero-dimensional(0D)C-Dots onto ultrathin two-dimensional(2D)nanosheets to form 0D/2D nanocomposites.In this review,we systematically introduce the progress on the design and construction of 0D/2D heterojunction photocatalysts based on C-Dots,and their applications across different photocatalytic reactions,such as hydrogen production,carbon dioxide reduction,and hydrogen peroxide synthesis.We also discuss the key role of various types of 0D/2D heterojunctions according to different photocatalytic mechanisms and corresponding promoting strategies for enhancing the catalytic activity,accelerating charge transfer,and coupling different sites for the surface oxidation/reduction reactions.Finally,the challenges and future research directions associated with these systems are discussed.展开更多
The purposeful construction of dual Z-scheme system to the formation of intimate interface contact and multi-channel charge flow through the system remains a huge challenge.Herein,a tandem 2D/0D/2D g-C_(3)N_(4)nanoshe...The purposeful construction of dual Z-scheme system to the formation of intimate interface contact and multi-channel charge flow through the system remains a huge challenge.Herein,a tandem 2D/0D/2D g-C_(3)N_(4)nanosheets/FeOOH quantum dots/ZnIn_(2)S_(4)nanosheets(CNFeZn)dual Z-scheme system(DZSS)has been successfully constructed using electrostatic self-assembly method.Owing to the band structure and elaborate morphology of 2D g-C_(3)N_(4),0D FeOOH and 2D ZnIn_(2)S_(4)in unique designed DZSS,plenty of spatial charge transfer channels are formed between the g-C_(3)N_(4)/FeOOH and FeOOH/ZnIn_(2)S_(4)interfaces,which greatly accelerate the charge separation and transfer.As bifunctional catalysts,CNFeZn DZSS achieves the highest H_(2)evolution rate of~436.6 mmol/h with a great promotion of~10.6 folds and~6.9 folds compared to pristine g-C_(3)N_(4)and ZnIn_(2)S_(4),respectively.Meanwhile,the H_(2)O_(2)production rate reached~301.19 mmol/L after 60 min irradiation,up to~5.1 times and~2.3 times that of pristine g-C_(3)N_(4)and ZnIn_(2)S_(4).Experiment and DFT calculation further confirmed that the stable double built-in electronic field can be formed owing to the electron configuration between double interfaces,and reveal that the ample atomic-level charge transfer channels were established in the strong interaction connected double interfaces,which can act as the charge migration pathway promote the separation of photogenerated charges.展开更多
文摘Designing and fabricating highly efficient photocatalysts for water splitting is a promising strategy to address energy and environmental issues.Cadmium sulfide(CdS)has received significant interest as a photocatalyst for visible‐light‐induced hydrogen(H2)generation.However,the severe photocorrosion,high overpotential,rapid charge recombination,and sluggish surface reaction kinetics drastically hinder its practical application in water splitting.Herein,uniform zinc cadmium sulfide(Zn_(0.5)Cd_(0.5)S)nanoparticles were anchored on ultrathin Ni(OH)_(2)nanosheets via a facile solution‐phase approach to form an intimate two‐dimensional(2D)/zero‐dimensional(0D)heterojunction.Under visible light irradiation,the 7%Ni(OH)_(2)/Zn_(0.5)Cd_(0.5)S composite exhibited the highest H2 production rate of 6.87 mmol·h^(–1)·g^(–1)with an apparent quantum yield of 16.8%at 420 nm,which is almost 43 times higher than that of pristine Zn_(0.5)Cd_(0.5)S and considerably higher than that of the Pt/Zn_(0.5)Cd_(0.5)S photocatalyst.The high photoactivity of the 2D/0D Ni(OH)_(2)/Zn_(0.5)Cd_(0.5)S heterojunction can be ascribed to its unique and robust structure,wherein the ultrathin Ni(OH)_(2)nanosheets not only provide an excellent platform for the incorporation of Zn_(0.5)Cd_(0.5)S nanoparticles but also serve as an effective cocatalyst to promote photoinduced electron transfer and offer more active sites for photocatalytic H_(2) generation.This work paves the way toward the development of versatile,low‐cost,and highly efficient 2D/0D heterojunction photocatalysts for solar energy conversion.
基金supported by the National Natural Science Foundation of China(22278194 and 21908081)
文摘Carbon dots(C-Dots)have received much attention in photocatalyst design and mechanism studies due to their precise size control,unique photoelectrical properties,and abundant surface-active sites,but their catalytic performance is still limited by issues such as severe charge recombination,agglomeration,and poor stability,which mainly stem from the small size and high surface area.A major solution to these problems is loading the zero-dimensional(0D)C-Dots onto ultrathin two-dimensional(2D)nanosheets to form 0D/2D nanocomposites.In this review,we systematically introduce the progress on the design and construction of 0D/2D heterojunction photocatalysts based on C-Dots,and their applications across different photocatalytic reactions,such as hydrogen production,carbon dioxide reduction,and hydrogen peroxide synthesis.We also discuss the key role of various types of 0D/2D heterojunctions according to different photocatalytic mechanisms and corresponding promoting strategies for enhancing the catalytic activity,accelerating charge transfer,and coupling different sites for the surface oxidation/reduction reactions.Finally,the challenges and future research directions associated with these systems are discussed.
基金supported by the Natural Science Foundation of Shandong Province(Grant No.ZR2021ME143,ZR2020MA076).
文摘The purposeful construction of dual Z-scheme system to the formation of intimate interface contact and multi-channel charge flow through the system remains a huge challenge.Herein,a tandem 2D/0D/2D g-C_(3)N_(4)nanosheets/FeOOH quantum dots/ZnIn_(2)S_(4)nanosheets(CNFeZn)dual Z-scheme system(DZSS)has been successfully constructed using electrostatic self-assembly method.Owing to the band structure and elaborate morphology of 2D g-C_(3)N_(4),0D FeOOH and 2D ZnIn_(2)S_(4)in unique designed DZSS,plenty of spatial charge transfer channels are formed between the g-C_(3)N_(4)/FeOOH and FeOOH/ZnIn_(2)S_(4)interfaces,which greatly accelerate the charge separation and transfer.As bifunctional catalysts,CNFeZn DZSS achieves the highest H_(2)evolution rate of~436.6 mmol/h with a great promotion of~10.6 folds and~6.9 folds compared to pristine g-C_(3)N_(4)and ZnIn_(2)S_(4),respectively.Meanwhile,the H_(2)O_(2)production rate reached~301.19 mmol/L after 60 min irradiation,up to~5.1 times and~2.3 times that of pristine g-C_(3)N_(4)and ZnIn_(2)S_(4).Experiment and DFT calculation further confirmed that the stable double built-in electronic field can be formed owing to the electron configuration between double interfaces,and reveal that the ample atomic-level charge transfer channels were established in the strong interaction connected double interfaces,which can act as the charge migration pathway promote the separation of photogenerated charges.
