Revealing the dynamics of the alloying and segregation of Pt-Co nanoparticles via in-situ environmental transmission electron microscopy
作者机构：Henan Key Laboratory of Diamond Optoelectronic Materials and DevicesKey Laboratory of Material PhysicsSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Center for Functional NanomaterialsBrookhaven National LaboratoryUptonNY 11973USA Department of Chemical and Biological EngineeringUniversity at BuffaloThe State University of New YorkBuffaloNY 14260USA Center for Combustion EnergySchool of Vehicle and MobilityTsinghua UniversityBeijing 100084China Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第2期
页 面：3055-3062页
核心收录：
学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 080502[工学-材料学] 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 Natural Science Foundation of China(Nos.52072345,U21A20328,22103047,and 12174348) the China Postdoctoral Science Foundation(No.2021T140621) the Natural Science Foundation of Henan Province(No.222300420077) Henan Center for Outstanding Overseas Scientists(No.GZS201903) support from Strategic Priority Research Program(B)(No.XDB33030200)of Chinese Academy of Sciences performed at the Center for Functional Nanomaterials,which is a US DOE Office of Science Facility,at Brookhaven National Laboratory under Contract No.DESC0012704
主 题：intermetallic catalyst alloying ripening segregation dynamics environmental transmission electron microscopy(ETEM)
摘 要：Thermal treatment is a general and efficient way to synthesize intermetallic catalysts and may involve complicated physical *** far,the mechanisms leading to the size and composition heterogeneity,as well as the phase segregation behavior in Pt-Co nanoparticles(NPs)are still not well *** in-situ environmental transmission electron microscopy,the formation dynamics and segregation behaviors of Pt-Co alloyed NPs during the thermal treatment were *** is found that Pt-Co NPs on zeolitic imidazolate frameworks-67-derived nanocarbon(NC)are formed consecutively through both particle migration coalescence and the Ostwald ripening *** existence of Pt NPs is found to affect the movement of Co NPs during their *** the help of theoretical calculations,the correlations between the composition and migration of the Pt and Co during the ripening process were *** complex alloying processes are revealed as key factors leading to the heterogeneity of the synthesized Pt-Co alloyed *** oxidation environment,the Pt-Co NPs become surface faceted gradually,which can be attributed to the oxygen facilitated relatively higher segregation rate of Co from the(111)*** work advances the fundamental understanding of design,synthesis,and durability of the Pt-based nanocatalysts.
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