Catalytic oxidation and selective sensing of carbon monoxide for sense and shoot device using ZnO–CuO hybrids

Ghosh, Abhishek and Bhowmick, Tynee and Labhasetwar, N. K. and Majumder, Subhasish B. (2019) Catalytic oxidation and selective sensing of carbon monoxide for sense and shoot device using ZnO–CuO hybrids. Materialia, 5 (100177). ISSN 2589-1529

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Abstract

In the present work, we have demonstrated that ZnO–CuO based hetero-composites exhibit selective CO sensing with T 100 is in close proximity to T opt to yield simultaneous CO sensing together with its 100% catalytic oxidation for sense and shoot devices. When these heterocomposites are exposed to CO, reduction of Cu 2 + ions in CuO grains leads to a strong metal semiconductor interaction (SMSI) between Cu 2 + /Cu + /Cu 0 species (in CuO grains) and ZnO grains across the ZnO-CuO interface. The SMSI interaction promotes the generation of oxygen vacancies in neighboring ZnO lattice. Eventually activated oxygen (O ∗ ads ) and CO (CO ∗ ads ) are preferentially chemisorbed on zinc oxide (in its vacant oxygen sites) and CuO (on the surface of Cu 2 + /Cu + /Cu 0 ions) respectively. The activated oxygen reacts immediately with adsorbed CO to yield selective CO sensing together with 100% CO oxidation. For ZnO–CuO (1:1) composites, the measured T opt ( ∼175 °C) and T 100 ( ∼200 °C) temperatures are significantly lowered as compared to the respective temperatures measured for indium doped ZnO (T opt ∼300 °C, T 100 ∼550 °C) and CuO (T opt ∼200 °C,T 100 ∼300 °C) catalysts. Fine tuning of the mole fraction of ZnO and CuO are necessary for these hetero-composites to yield T 100 of catalytic activity close to T opt for maximum CO sensing.

Item Type:	Article
Uncontrolled Keywords:	Selective CO Sensing; SMSI Interaction; Sense and Shoot
Subjects:	Chemistry, Chemical Technology Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Mr. RK Lohiya
Date Deposited:	28 Mar 2019 09:50
Last Modified:	28 Mar 2019 09:50
URI:	http://neeri.csircentral.net/id/eprint/1221

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