title: Efficient CO Oxidation by 50-Facet Cu2O Nanocrystals Coated with CuO Nanoparticles.
abstract: As carbon monoxide oxidation is widely used for various chemical processes (such as methanol synthesis and water-gas shift reactions H2O + CO ⇄ CO2+ H2) as well as in industry, it is essential to develop highly energy efficient, inexpensive, and eco-friendly catalysts for CO oxidation. Here we report green synthesis of ∼10 nm sized CuO nanoparticles (NPs) aggregated on ∼400 nm sized 50-facet Cu2O polyhedral nanocrystals. This CuO-NPs/50-facet Cu2O shows remarkable CO oxidation reactivity with very high specific CO oxidation activity (4.5 μmolCOm-2s-1at 130 °C) and near-complete 99.5% CO conversion efficiency at ∼175 °C. This outstanding catalytic performance by CuO NPs over the pristine multifaceted Cu2O nanocrystals is attributed to the surface oxygen defects present in CuO NPs which facilitate binding of CO and O2on their surfaces. This new material opens up new possibilities of replacing the usage of expensive CO oxidation materials.
authors.forename: Ahmad M
authors.initials: AM
authors.lastname: Harzandi
authors.forename: Jitendra N
authors.initials: JN
authors.lastname: Tiwari
authors.forename: Ho Sik
authors.initials: HS
authors.lastname: Lee
authors.forename: Himchan
authors.initials: H
authors.lastname: Jeon
authors.forename: Woo Jong
authors.initials: WJ
authors.lastname: Cho
authors.forename: Geunsik
authors.initials: G
authors.lastname: Lee
authors.affiliation: Pohang Accelerator Laboratory, Pohang University of Science and Technology , Pohang 37673, Korea.
authors.forename: Jaeyoon
authors.initials: J
authors.lastname: Baik
authors.forename: Ja Hun
authors.initials: JH
authors.lastname: Kwak
authors.forename: Kwang S
authors.identifier: http://orcid.org/0000-0002-6929-5359
authors.initials: KS
authors.lastname: Kim
keywords: 50-facet Cu2O nanocrystals; CO oxidation; CuO nanoparticles; oxygen vacancy; turnover frequency