Inverse iron oxide/metal catalysts from galvanic replacement

Yifeng Zhu, Xin Zhang, Katherine Koh, Libor Kovarik, John L. Fulton, Kevin M. Rosso and Oliver Y. Gutiérrez ()
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Yifeng Zhu: Pacific Northwest National Laboratory
Xin Zhang: Pacific Northwest National Laboratory
Katherine Koh: Pacific Northwest National Laboratory
Libor Kovarik: Pacific Northwest National Laboratory
John L. Fulton: Pacific Northwest National Laboratory
Kevin M. Rosso: Pacific Northwest National Laboratory
Oliver Y. Gutiérrez: Pacific Northwest National Laboratory

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-16830-4

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