Grain boundary boosting the thermal stability of Pt/CeO_(2)thin films

作     者：Luyao Wang Xiaobao Li Xiangchen Hu Shuyue Chen Zhehao Qiu Yifan Wang Hui Zhang Yi Yu Bo Yang Yong Yang Pasquale Orgiani Carmela Aruta Nan Yang Luyao Wang;Xiaobao Li;Xiangchen Hu;Shuyue Chen;Zhehao Qiu;Yifan Wang;Hui Zhang;Yi Yu;Bo Yang;Yong Yang;Pasquale Orgiani;Carmela Aruta;Nan Yang

作者机构：Electrochemical thin film groupSchool of physical science and technologyShanghaiTech UniversityShanghai 201210China State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of physical science and technologyShanghaiTech UniversityShanghai 201210China CNR-IOMTASC National LaboratoryI-34149 TriesteItaly CNR-SPINUOS RomaArea della Ricerca di Tor VergataRome I-00133Italy 

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：3278-3286页

核心收录：

学科分类：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）] 

基　　金：The APXPS experiments were performed at BL02B01 of SSRF with the approval of the Proposal Assessing Committee of SiP.ME2 platform project(Proposal No.2019-SSRF-PT-011613) the Natural Science Foundation of China(No.11227902) the Shanghai Key Research Program(No.20ZR1436700) 

主　　题：platinum doped cerium oxide(Pt/CeO_(2)) pulsed laser deposition epitaxial thin films grain boundaries defect engineering in-situ ambient-pressure X-ray photoemission spectroscopy 

摘      要：Understanding how defect chemistry of oxide material influences the thermal stability of noble metal dopant ions plays an important role in designing high-performance heterogeneous catalytic *** we use in-situ ambient-pressure X-ray photoemission spectroscopy(APXPS)to experimentally determine the role of grain boundary in the thermal stability of platinum doped cerium oxide(Pt/CeO_(2)).The grain boundaries were introduced in Pt/CeO_(2)thin films by pulsed laser deposition without significantly change of the surface *** defect level was tuned by the strain field obtained using a highly/low mismatched *** Pt/CeO_(2)thin film models having well defined crystallographic properties but different grain boundary structural defect levels provide an ideal platform for exploring the evolution of Pt–O–Ce bond with changing the temperature in reducing *** have direct demonstration and explanation of the role of Ce^(3+)induced by grain boundaries in enhancing Pt2+*** observe that the Pt^(2+)–O–Ce^(3+)bond provides an ideal coordinated site for anchoring of Pt^(2+)ions and limits the further formation of oxygen vacancies during the reduction with H_(2).Our findings demonstrate the importance of grain boundary in the atomic-scale design of thermally stable catalytic active sites.