Efficient CO Oxidation by 50-Facet Cu2O Nanocrystals Coated with CuO Nanoparticles

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 repo...

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Published inACS applied materials & interfaces Vol. 9; no. 3; pp. 2495 - 2499
Main Authors Harzandi, Ahmad M, Tiwari, Jitendra N, Lee, Ho Sik, Jeon, Himchan, Cho, Woo Jong, Lee, Geunsik, Baik, Jaeyoon, Kwak, Ja Hun, Kim, Kwang S
Format Journal Article
LanguageEnglish
Published American Chemical Society 25.01.2017
Subjects
50-facet Cu2O nanocrystals
CO oxidation
turnover frequency
oxygen vacancy
CuO nanoparticles
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Summary: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 μmolCO m–2 s–1 at 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 O2 on their surfaces. This new material opens up new possibilities of replacing the usage of expensive CO oxidation materials.
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ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.6b13843