One-step preparation of Co 2 V 2 O 7 : synthesis and application as a Fenton-like catalyst in a gas diffusion electrode

• Published in: Physical chemistry chemical physics : PCCP 2022-05, Vol.24 (17), p.10249-10262
• Main Authors: Gromboni, Murilo Fernando, Cordeiro-Junior, Paulo Jorge Marques, Corradini, Patricia Gon, Mascaro, Lucia Helena, Lanza, Marcos Roberto de Vasconcelos
• Format: Article
• Language: English
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/d2cp00072e

Bimetallic oxides and MOFs have been used as catalysts for the ORR two-electron and Fenton-based processes. This work reports the development of a new green one-step route for obtaining Co V O . The Co V O oxide was immobilized on Printex-L6 carbon and used as a catalyst for the oxygen reduction reaction (ORR) and in heterogeneous Fenton-based processes. The PL6C/2.5% Co V O sample exhibited the best performance in the ORR a two-electron pathway, increasing the selectivity for H O generation. Electrochemical impedance spectroscopy analysis showed a decrease in charge transfer resistance in the Co V O /PL6C matrix. The application of a gas diffusion electrode (GDE) modified with 2.5% Co V O resulted in a 30% increase in H O production compared to the unmodified GDE. The unmodified GDE promoted methyl-paraben (MeP) removal of ∼80% after 90 min treatment, whereas the modified GDE promoted ∼90% of MeP removal in 30 min. The results obtained point to the potential of Co V O in improving the efficiency of GDE when applied for the treatment of organic pollutants.