Atomically dispersed single-atom catalysts(SACs)have been extensively studied over the past decade because of their high atom utilization efficiencies and specific selectivities.Although numerous strategies have been ...Atomically dispersed single-atom catalysts(SACs)have been extensively studied over the past decade because of their high atom utilization efficiencies and specific selectivities.Although numerous strategies have been proposed to obtain SACs with high densities and stabilities,the transformation mechanism that occurs during the reaction is still unclear.This review summarizes the structural evolution of SACs in the preparation process and reaction with various electron microscopy techniques at atomic scale under environmental conditions.Current state-of-the-art environmental electron microscopy studies on SACs mainly focus on porous carbons,metals or metal oxides,and some specific composite materials.The dynamic evolution of SACs under various reaction conditions is also investigated in this study.Finally,we highlight the challenges and drawbacks of the current studies and the prospects for the future exploration of SACs with environmental strategies.展开更多
基金the National Natural Science Foundation of China(52204255)Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization(PCSX202201)+1 种基金China Postdoctoral Science Foundation(2020M682764)the Yangzhou University Start-up Foundation.
文摘Atomically dispersed single-atom catalysts(SACs)have been extensively studied over the past decade because of their high atom utilization efficiencies and specific selectivities.Although numerous strategies have been proposed to obtain SACs with high densities and stabilities,the transformation mechanism that occurs during the reaction is still unclear.This review summarizes the structural evolution of SACs in the preparation process and reaction with various electron microscopy techniques at atomic scale under environmental conditions.Current state-of-the-art environmental electron microscopy studies on SACs mainly focus on porous carbons,metals or metal oxides,and some specific composite materials.The dynamic evolution of SACs under various reaction conditions is also investigated in this study.Finally,we highlight the challenges and drawbacks of the current studies and the prospects for the future exploration of SACs with environmental strategies.
