Indium-decorated Pd nanocubes degrade nitrate anions rapidly

Elias, Welman C. and Heck, Kimberly N. and Guo, Sujin and Yazdi, Sadegh and Ayala-Orozco, Ciceron and Grossweiler, Sophia and Domingos, Josiel B. and Ringe, Emilie and Wong, Michael S. (2020) Indium-decorated Pd nanocubes degrade nitrate anions rapidly. Applied Catalysis B: Environmental, 276. p. 119048. ISSN 09263373 DOI https://doi.org/10.1016/j.apcatb.2020.119048

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Official URL: https://doi.org/10.1016/j.apcatb.2020.119048

Abstract

Indium-decorated palladium nanoparticles (In-on-PdNPs) are active for room-temperature catalytic reduction of aqueous nitrate, where the active sites are metallic In atoms on the Pd surface. The PdNPs are pseudo-spherical in shape, and it is unclear if their faceted nature plays a role in nitrate reduction. We synthesized different-sized, cube-shaped NPs with differing In coverages (sc%), and studied the resultant In-on-Pd-nanocubes (NCs) for nitrate reduction. The NCs exhibited volcano-shape activity dependence on In sc%, with peak activity around 65–75 sc%. When rate constants were normalized to undercoordinated atoms (at edge + corners), the NCs exhibited near-identical maximum activity (20×-higher than In-on-PdNPs) at ρIn/Pd edge+corner ∼0.5 (∼5 In atoms per 10 edge and corner atoms). NCs with a higher In edge + corner density (ρIn/Pd edge+corner ∼1.5) were less active but did not generate NH4+ at nitrate conversions tested up to 36 %. Edge-decorated cubes may be the structural basis of improved bimetallic catalytic denitrification of water.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Applied Catalysis B: Environmental
Volume: 276
Page Range: p. 119048
Identification Number: https://doi.org/10.1016/j.apcatb.2020.119048
Depositing User: Sarah Humbert
Date Deposited: 06 Aug 2020 23:02
Last Modified: 06 Aug 2020 23:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/4830

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