Visualizing light-induced dynamic structural transformations of Au clusters-based photocatalyst via in situ TEM
作者机构：State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China cMACSDepartment of Microbial and Molecular SystemsKU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium Department of ChemistryKU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2021年第14卷第8期
页 面：2805-2809页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
基 金：supported by the National Natural Science Foundation of China(Nos.21902132,91934303,21390391,21473193,21673198,and 21621091) the Award Program for Minjiang Scholar Professorship,the National Key Research and Development Program of China(No.2017YFA0206500) the European Union’s Horizon 2020 research and innovation programme under the Marie Sktodowska-Curie grant agreement No.891276,Research Foundation-Flanders(FWO,No.128002IN) the KU Leuven Research Fund(C14/15/053 and C14/19/079) the European Union(Horizon 2020)Marie Sklodowska-Curie innovation program(No.722591)
主 题：photocatalysis dynamic structural transformation Au clusters in situ TEM
摘 要：Ultrasmall gold(Au)clusters have been regarded as one of the prototypes materials for solar energy conversion due to their unique strong molecular-like light absorption ***,the light-induced aggregation of Au clusters into nanoparticles is one of the most important factors that restricts its application in *** Au clusters aggregation has been widely demonstrated,the underlying mechanism for cluster fusion is still unclear due to the lack of experimental ***,we report the direct observation of Au clusters on TiO_(2) nanosheets aggregating when used as visible light photocatalysts for the reduction of *** in situ high-resolution transmission electron microscopy(TEM),the coexistence of two fusion mechanisms of Au clusters on TiO_(2) under ultraviolet-visible(UV-Vis)light irradiation in air is identified,i.e.,the migration and coalescence(MC)and Ostwald ripening(OR).Additionally,the correlation between the photostability of Au clusters and reaction atmospheres has been investigated,among which Au clusters have higher stability in an inert N_(2) atmosphere or vacuum than the oxidizing atmospheres(i.e.,air and O_(2)).These results indicate the inherent stability of Au cluster during photocatalysis,and instability comes from the consuming of ligand *** work not only discloses the underlying mechanism of Au cluster sintering but also provides guidelines for enhancing metal clusters-based photocatalysts stability.
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