Fe/Au galvanic nanocells to generate self-sustained Fenton reactions without additives at neutral pH
Shahnazarova, Gubakhanim (Institut Català de Nanociència i Nanotecnologia)
Al Hoda Al Bast, Nour (Institut Català de Nanociència i Nanotecnologia)
Ramirez, Jessica Casandra (Institut Català de Nanociència i Nanotecnologia)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)
Esteve, Jaume (Institut de Microelectrònica de Barcelona)
Fraxedas, Jordi (Institut Català de Nanociència i Nanotecnologia)
Serrà, Albert (Universitat de Barcelona. Institute of Nanoscience and Nanotechnology)
Esplandiu Egido, Maria José (Institut Català de Nanociència i Nanotecnologia)
Sepúlveda, Borja (Institut de Microelectrònica de Barcelona)

Date:	2024
Abstract:	The generation of reactive oxygen species (ROS) via the Fenton reaction has received significant attention for widespread applications. This reaction can be triggered by zero-valent metal nanoparticles by converting externally added HO into hydroxyl radicals (˙OH) in acidic media. To avoid the addition of external additives or energy supply, developing self-sustained catalytic systems enabling onsite production of HO at a neutral pH is crucial. Here, we present novel galvanic nanocells (GNCs) based on metallic Fe/Au bilayers on arrays of nanoporous silica nanostructures for the generation of self-sustained Fenton reactions. These GNCs exploit the large electrochemical potential difference between the Fe and Au layers to enable direct HO production and efficient release of Fe in water at neutral pH, thereby triggering the Fenton reaction. Additionally, the GNCs promote Fe/Fe circulation and minimize side reactions that passivate the iron surface to enhance their reactivity. The capability to directly trigger the Fenton reaction in water at pH 7 is demonstrated by the fast degradation and mineralization of organic pollutants, by using tiny amounts of catalyst. The self-generated HO and its transformation into ˙OH in a neutral environment provide a promising route not only in environmental remediation but also to produce therapeutic ROS and address the limitations of Fenton catalytic nanostructures.
Grants:	Agencia Estatal de Investigación PGC2018-095032-B-100 Ministerio de Ciencia, Innovación y Universidades PID2019-106229RB-100 Agencia Estatal de Investigación PID2021-124568NB-I00 European Commission 754558 Agencia Estatal de Investigación CEX2021-001214-S Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00651
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Materials Horizons, Vol. 11, Issue 9 (May 2024) , p. 2206-2216, ISSN 2051-6355

DOI: 10.1039/d3mh01935g

11 p, 1.3 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles