Transition metal chalcogenides(TMCs)have been well-established as ideal low-dimensional systems for photocatalytic hydrogen evolution.Strategies toward improving the activity of these TMC photocatalysts by crafting he...Transition metal chalcogenides(TMCs)have been well-established as ideal low-dimensional systems for photocatalytic hydrogen evolution.Strategies toward improving the activity of these TMC photocatalysts by crafting heterostructures have been intensively studied.In this study,a two-dimensional(2D)CoAl layered double hydroxide(CoAl-LDH)has been assembled on 2D TMCs(CdIn_(2)S_(4),In_(2)S_(3),and ZnIn_(2)S_(4))to construct novel 2D/2D heterostructures by a facile electrostatic assembly method.The intimate interaction at the interface of hybrids and the suitable energy level alignment enable an efficient pathway for electron transfer to improve the photoactivity.Experimental results show that the photocatalytic activity of the CdIn_(2)S_(4)@CoAl-LDH hybrids for H_(2)production is about 4.3 times higher than that of CdIn_(2)S_(4)nanosheets under visible-light irradiation.The effect of 2D CoAl-LDH on enhancing the photoactivities of In_(2)S_(3)and ZnIn_(2)S_(4)by similarly constructing 2D heterostructures has also been determined.This work establishes a foundation to construct 2D TMC-based heterostructures using CoAl-LDH nanosheets toward enhanced photoredox activity.展开更多
基金supported by the National Natural Science Foundation of China(52071137,51977071,51802040,and 21802020)the Science and Technology Innovation Program of Hunan Province(2021RC3066 and 2021RC3067)+1 种基金the Natural Science Foundation of Hunan Province(2020JJ3004 and 2020JJ4192)N.Zhang and X.Xie also acknowledge the financial support from the Fundamental Research Funds for the Central Universities.
文摘Transition metal chalcogenides(TMCs)have been well-established as ideal low-dimensional systems for photocatalytic hydrogen evolution.Strategies toward improving the activity of these TMC photocatalysts by crafting heterostructures have been intensively studied.In this study,a two-dimensional(2D)CoAl layered double hydroxide(CoAl-LDH)has been assembled on 2D TMCs(CdIn_(2)S_(4),In_(2)S_(3),and ZnIn_(2)S_(4))to construct novel 2D/2D heterostructures by a facile electrostatic assembly method.The intimate interaction at the interface of hybrids and the suitable energy level alignment enable an efficient pathway for electron transfer to improve the photoactivity.Experimental results show that the photocatalytic activity of the CdIn_(2)S_(4)@CoAl-LDH hybrids for H_(2)production is about 4.3 times higher than that of CdIn_(2)S_(4)nanosheets under visible-light irradiation.The effect of 2D CoAl-LDH on enhancing the photoactivities of In_(2)S_(3)and ZnIn_(2)S_(4)by similarly constructing 2D heterostructures has also been determined.This work establishes a foundation to construct 2D TMC-based heterostructures using CoAl-LDH nanosheets toward enhanced photoredox activity.
