Inverse iron oxide/metal catalysts from galvanic replacement

Public Time: 2020-06-29 00:00:00
Journal: Nature Communications
doi: 10.1038/s41467-020-16830-4
Author: Yifeng Zhu;Xin Zhang;Katherine Koh;Libor Kovarik;John L. Fulton;Kevin M. Rosso;Oliver Y. Gutiérrez
Summary: Key chemical transformations require metal and redox sites in proximity at interfaces; however, in traditional oxide-supported materials, this requirement is met only at the perimeters of metal nanoparticles. We report that galvanic replacement can produce inverse FeOx/metal nanostructures in which the concentration of oxide species adjoining metal domains is maximal. The synthesis involves reductive deposition of rhodium or platinum and oxidation of Fe2+ from magnetite (Fe3O4). We discovered a parallel dissolution and adsorption of Fe2+ onto the metal, yielding inverse FeOx-coated metal nanoparticles. This nanostructure exhibits the intrinsic activity in selective CO2 reduction that simple metal nanoparticles have only at interfaces with the support. By enabling a simple way to control the surface functionality of metal particles, our approach is not only scalable but also enables a versatile palette for catalyst design.
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