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

IR@CSIR-NEERI

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Title Catalytic oxidation and selective sensing of carbon monoxide for sense and
shoot device using ZnO–CuO hybrids
 
Creator Ghosh, Abhishek
Bhowmick, Tynee
Labhasetwar, N. K.
Majumder, Subhasish B.
 
Subject Chemistry, Chemical Technology
Materials Science
 
Description 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.
 
Publisher Elsevier
 
Date 2019
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1221/1/1-s2.0-S258915291830214X-main.pdf
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
 
Relation https://www.sciencedirect.com/journal/materialia
http://neeri.csircentral.net/1221/