Tailored Co3O4‑Based Nanosystems: Toward Photocatalysts for Air Purification

• Published in: ACS applied materials & interfaces Vol. 13; no. 37; pp. 44520 - 44530
• Main Authors: Fragoso, Javier, Barreca, Davide, Bigiani, Lorenzo, Sada, Cinzia, Lebedev, Oleg I, Modin, Evgeny, Pavlovic, Ivana, Sánchez, Luis, Maccato, Chiara
• Format: Journal Article
• Language: English
• Published: American Chemical Society 22.09.2021
• Subjects: Functional Inorganic Materials and Devices; nanosystems; chemical vapor deposition; nitrogen oxides; SnO2; photocatalysis; Fe2O3; Co3O4
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.1c09921

The adverse effects of NO x (NO + NO2) gases on the environment and human health have triggered the development of sustainable photocatalysts for their efficient removal (De-NO x ). 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 NO x conversion to harmless nitrate species. A preliminary evaluation of De-NO x 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.