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Title: Intermediate Structures of Pt−Ni Nanoparticles during Selective Chemical and Electrochemical Etching
Authors: TAN SHU FEN 
Hongmei Jin
Teck Leong Tan
Keywords: Etching,Platinum,Layers,Bimetals,Transmission electron microscopy
Issue Date: 2019
Publisher: American Chemical Society
Citation: TAN SHU FEN, CHEE SEE WEE, ZHASLAN BARAISSOV, Hongmei Jin, Teck Leong Tan, UTKUR MIRZIYODOVICH MIRSAIDOV (2019). Intermediate Structures of Pt−Ni Nanoparticles during Selective Chemical and Electrochemical Etching. The Journal Of Physical Chemistry Letters 10 : 6090−6096. ScholarBank@NUS Repository.
Rights: CC0 1.0 Universal
Related Dataset(s): DOI:10.1021/acs.jpclett.9b02388
Abstract: Both chemical and electrochemical etching are effective methods for tailoring the surface composition of Pt-based catalytic bimetallic nanoparticles (NPs). However, the detailed nanoscale etching mechanisms, which are needed for achieving fine control over the etch processes, are still not understood. Here, we study selective chemical and electrochemical Ni etching of Pt−Ni rhombic dodecahedron NPs using in situ liquid-phase transmission electron microscopy. Our real-time observations show that the intermediate NP structures evolve differently in the two cases. Chemical etching of Ni starts from localized pits on the NP surface, in contrast to the uniform dissolution of Ni during the electrochemical etching. Our study reveals how oxidative etching participates in the removal of a non-noble metal and the subsequent formation of noblemetal-rich NPs. The mechanistic insights reported here highlight the role of a native surface oxide layer on the etching behavior, which is important for the design of NPs with specific surface composition for applications in electrocatalysis.
Source Title: The Journal Of Physical Chemistry Letters
ISSN: 19487185
DOI: 10.1021/acs.jpclett.9b02388
Rights: CC0 1.0 Universal
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