Nanoscale-Phase-Separated Pd鈥揜h Boxes Synthesized via Metal Migration: An Archetype for Studying Lattice Strain and Composition Effects in Electrocatalysis

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• 作者：Brian T. Sneed ; Casey N. Brodsky ; Chun-Hong Kuo ; Leo K. Lamontagne ; Ying Jiang ; Yong Wang ; Franklin (Feng) Tao ; Weixin Huang ; Chia-Kuang Tsung
• 刊名：Journal of the American Chemical Society
• 出版年：2013
• 出版时间：October 2, 2013
• 年：2013
• 卷：135
• 期：39
• 页码：14691-14700
• 全文大小：677K
• 年卷期：v.135,no.39(October 2, 2013)
• ISSN：1520-5126

文摘

Developing syntheses of more sophisticated nanostructures comprising late transition metals broadens the tools to rationally design suitable heterogeneous catalysts for chemical transformations. Herein, we report a synthesis of Pd鈥揜h nanoboxes by controlling the migration of metals in a core鈥搒hell nanoparticle. The Pd鈥揜h nanobox structure is a grid-like arrangement of two distinct metal phases, and the surfaces of these boxes are {100} dominant Pd and Rh. The catalytic behaviors of the particles were examined in electrochemistry to investigate strain effects arising from this structure. It was found that the trends in activity of model fuel cell reactions cannot be explained solely by the surface composition. The lattice strain emerging from the nanoscale separation of metal phases at the surface also plays an important role.