Nanoconfinement-induced water molecules and hydrogen molecules transport behaviors in ball-in-ball structure photocatalysts to improve hydrogen evolution  

作　　者：Ben Chong Baorong Xu He Li Honghui Ou Guidong Yang 

机构地区：[1]XJTU-Oxford Joint International Research Laboratory of Catalysis,School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Nano Research》2024年第5期3752-3760,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.22108214);Joint Funds of the National Natural Science Foundation of China(No.U22A20391).

摘　　要：The diffusion,adsorption/desorption behaviors of water molecules and hydrogen molecules are of great importance in heterogeneous photocatalytic hydrogen production.In the study of structure-property-performance relationships,nanoconfined space provides an ideal platform to promote mass diffusion and transfer due to their extraordinary properties that are different from the bulk systems.Herein,we designed and prepared a nanoconfined CdS@SiO_(2)-NH_(2) nanoreactor,whose shell is composed of amino-functionalized silica nanochannels,and encapsulates spherical CdS as a photocatalyst inside.Experimental and simulated results reveal that the amino-functionalized nanochannels promote water molecules’and hydrogen molecules’directional diffusion and transport.Water molecules are enriched in the nanocavity between the core and the shell,and promote the interfacial photocatalytic reaction.As a result,the maximized water enrichment and minimized hydrogen-occupied active sites enable photocatalyst with optimized mass transfer kinetics and localization electron distribution on the CdS surface,leading to superior hydrogen production performance with activity as high as 37.1 mmol·g^(-1)·h^(-1).

关 键 词：NANOCHANNELS photocatalytic hydrogen evolution mass transfer amino-functionalized CdS 

分 类 号：O64[理学—物理化学]