Tailored Co₃O₄-Based Nanosystems: Toward Photocatalysts for Air Purification
2021
Fragoso, Javier | Barreca, Davide | Bigiani, Lorenzo | Sada, Cinzia | Lebedev, Oleg I. | Modin, Evgeny | Pavlović, Ivana | Sanchez, L. (Luís) | Maccato, Chiara
The adverse effects of NOₓ (NO + NO₂) gases on the environment and human health have triggered the development of sustainable photocatalysts for their efficient removal (De-NOₓ). In this regard, the present work focuses on supported Co₃O₄-based nanomaterials fabricated via chemical vapor deposition (CVD), assessed for the first time as photocatalysts for sunlight-activated NO oxidation. A proof-of-principle investigation on the possibility of tailoring material performances by heterostructure formation is explored through deposition of SnO₂ or Fe₂O₃ onto Co₃O₄ by radio frequency (RF) sputtering. A comprehensive characterization by complementary analytical tools evidences the formation of high-purity columnar Co₃O₄ arrays with faceted pyramidal tips, conformally covered by very thin SnO₂ and Fe₂O₃ overlayers. Photocatalytic functional tests highlight an appreciable activity for bare Co₃O₄ systems, accompanied by a high selectivity in NOₓ conversion to harmless nitrate species. A preliminary evaluation of De-NOₓ performances for functionalized systems revealed a direct dependence of the system behavior on the chemical composition, SnO₂/Fe₂O₃ overlayer morphology, and charge transfer events between the single oxide constituents. Taken together, the present results can provide valuable guidelines for the eventual implementation of improved photocatalysts for air purification.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل National Agricultural Library