Efficient CO oxidation by 50-facet Cu2O nanocrystals coated with CuO nanoparticles

Ahmad M. Harzandi; Jitendra N. Tiwari; Ho Sik Lee; Himchan Jeon; Woo Jong Cho; Geunsik Lee; Jaeyoon Baik; Ja Hun Kwak; Kwang S. Kim

doi:10.1021/acsami.6b13843

Efficient CO oxidation by 50-facet Cu₂O nanocrystals coated with CuO nanoparticles

Ahmad M. Harzandi, Jitendra N. Tiwari, Ho Sik Lee, Himchan Jeon, Woo Jong Cho, Geunsik Lee, Jaeyoon Baik, Ja Hun Kwak, Kwang S. Kim

Department of Energy and Materials Engineering

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

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 μmol_CO m^-2 s^-1 at 130 °C) and nearcomplete 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. (Graph Presented).

Original language	English
Pages (from-to)	2495-2499
Number of pages	5
Journal	ACS Applied Materials and Interfaces
Volume	9
Issue number	3
DOIs	https://doi.org/10.1021/acsami.6b13843
State	Published - 25 Jan 2017

Keywords

50-facet CuO nanocrystals
CO oxidation
CuO nanoparticles
Oxygen vacancy
Turnover frequency

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10.1021/acsami.6b13843

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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 μmolCO m-2 s-1 at 130 °C) and nearcomplete 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. (Graph Presented).",

keywords = "50-facet CuO nanocrystals, CO oxidation, CuO nanoparticles, Oxygen vacancy, Turnover frequency",

author = "Harzandi, {Ahmad M.} and Tiwari, {Jitendra N.} and Lee, {Ho Sik} and Himchan Jeon and Cho, {Woo Jong} and Geunsik Lee and Jaeyoon Baik and Kwak, {Ja Hun} and Kim, {Kwang S.}",

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AU - Harzandi, Ahmad M.

AU - Tiwari, Jitendra N.

AU - Lee, Ho Sik

AU - Jeon, Himchan

AU - Cho, Woo Jong

AU - Lee, Geunsik

AU - Baik, Jaeyoon

AU - Kwak, Ja Hun

AU - Kim, Kwang S.

PY - 2017/1/25

Y1 - 2017/1/25

N2 - 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 nearcomplete 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. (Graph Presented).

AB - 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 nearcomplete 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. (Graph Presented).

KW - 50-facet CuO nanocrystals

KW - CO oxidation

KW - CuO nanoparticles

KW - Oxygen vacancy

KW - Turnover frequency

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Efficient CO oxidation by 50-facet Cu₂O nanocrystals coated with CuO nanoparticles

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