Effective fabrication of porous Au-Ag alloy nanorods for in situ Raman monitoring catalytic oxidation and reduction reactions

作     者：Shanlin Ke Caixia Kan Xingzhong Zhu Changshun Wang Weijian Gao Zhaosheng Li Xiaoguang Zhu Daning Shi Shanlin Ke;Caixia Kan;Xingzhong Zhu;Changshun Wang;Weijian Gao;Zhaosheng Li;Xiaoguang Zhu;Daning Shi

作者机构：College of ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Aerospace Information Materials and PhysicsMinistry of Industry and Information TechnologyNanjing 210016China National Laboratory of Solid State MicrostructuresNanjing UniversityNanjing 210093China Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of EducationNanjing 210016China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第91卷第32期

页      面：262-269页

核心收录：

学科分类：081705[工学-工业催化] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 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：financially supported by the National Natural Science Foundation of China (Nos. 11774171, 21805137 and11874220) the Fundamental Research Funds for the Central Universities (No. NT2020019) the Open Fund of Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education(No. INMD-2020M03) the Priority Academic Program Development of Jiangsu Higher Education Institutions (No. KYZZ16-0165) 

主　　题：Catalysis Porous Au-Ag alloy nanorod High-index facets Raman monitoring Oxidation and reduction 

摘      要：Porous metal nanostructures exhibit excellent catalytic properties due to their high surface-to-volume ratios and abundant catalytic active sites. However, it is still challenging to control nanopores density and structural features in a facile route and the preparation of porous alloy nanorods for catalytic application has not been well explored. In this work, we demonstrate a synthetic strategy to fabricate highly porous Au–Ag alloy nanorods(P-Au Ag NRs) by critically dealloying Ag atoms from homogeneous solid Au–Ag alloy nanorods(Au Ag NRs). Combining the merits of the tunable plasmonic properties of noble metal nanorods, excellent stabilities of alloys, and superior catalytic activities of porous structures, we use the P-Au Ag NRs as a Raman probe for the in situ monitoring of the catalytic oxidation of 3,3 ,5,5 tetramethylbenzidine(TMB) and reduction of 4-nitrothiophenol(4-NTP). We also compare their compositiondependent catalytic activities. The results show that P-Au Ag NRs possess superior chemical stability and higher catalytic activity than those of core-shell structures due to synergistic structural and chemical mechanisms. This strategy provides a predictive design approach for the next-generation alloy catalysts with high-performance.