Efficient CO Oxidation by 50-Facet Cu2O Nanocrystals Coated with CuO Nanoparticles
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- 作者：Ahmad M. Harzandi ; Jitendra N. Tiwari ; Ho Sik Lee ; Himchan Jeon ; Woo Jong Cho ; Geunsik Lee ; Jaeyoon Baik ; Ja Hun Kwak ; Kwang S. Kim
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2017
- 出版时间：January 25, 2017
- 年：2017
- 卷：9
- 期：3
- 页码：2495-2499
- 全文大小：420K
- ISSN：1944-8252
文摘
As carbon monoxide oxidation is widely used for various chemical processes (such as methanol synthesis and water-gas shift reactions H<sub>2sub>O + CO ⇄ CO<sub>2sub> + H<sub>2sub>) 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 Cu<sub>2sub>O polyhedral nanocrystals. This CuO-NPs/50-facet Cu<sub>2sub>O shows remarkable CO oxidation reactivity with very high specific CO oxidation activity (4.5 μmol<sub>COsub> m<sup>–2sup> s<sup>–1sup> 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 Cu<sub>2sub>O nanocrystals is attributed to the surface oxygen defects present in CuO NPs which facilitate binding of CO and O<sub>2sub> on their surfaces. This new material opens up new possibilities of replacing the usage of expensive CO oxidation materials.