Tracking the atomic pathways of Pt3Ni-Ni(OH)2 core-shell structures at the gas-liquid interface by in-situ liquid cell TEM

作     者：Junyu Zhang Gen Li Hong-Gang Liao Shi-Gang Sun Junyu Zhang;Gen Li;Hong-Gang Liao;Shi-Gang Sun

作者机构：State Key Lab of Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2020年第63卷第4期

页      面：513-518页

核心收录：

学科分类：0808[工学-电气工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the National Key Research and Development Program of China(2017YFA0206500) the National Natural Science Foundation of China(21673198,21373008,21621091) 

主　　题：Pt3Ni-Ni(OH)2 core-shell structure liquid cell electron microscopy gas-liquid interface dynamic transformation 

摘      要：Using the in-situ liquid cell transmission electron microscopy, the three-stage growth of Pt3Ni-Ni(OH)2 core-shell structures at the gas-liquid interfaces was clearly observed, which consists of(1) a thermodynamically driven Pt3Ni alloy core by the monomer attachment,(2) a nickel(Ni) shell formation due to the depletion of the Pt salt precursor, and(3) the oxidation and of the Ni shell into Ni(OH)2 flakes. We also further observed the nucleation and growth of the Ni(OH)2 flakes on an existing layer either at the middle part or at the step edge. More interestingly, the dynamic transformation among a Pt3Ni alloy, Ni clusters and Ni(OH)2 flakes was also imaged even at a high electron dose rate.