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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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
Depositing User: Mr. RK Lohiya
Date Deposited: 28 Mar 2019 09:50
Last Modified: 28 Mar 2019 09:50

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