Study of Cr2O3 nanoparticles supported on carbonaceous materials as catalysts for O2 reduction reaction

A series of chromium oxides (Cr2O3) nanoparticles supported on different carbonaceous material, namely: graphene, graphene oxide (GO) and graphite, were synthetized by precipitation of the salt precursors with precipitant (ammonia) and the subsequent thermal treatment. The catalytic activity of thes...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2021-08, Vol.895, p.115441, Article 115441
Main Authors: Almodóvar, Paloma, Santos, Florencio, González, Joaquín, Ramírez-Castellanos, Julio, González-Calbet, José María, Díaz-Guerra, Carlos, Fernández Romero, Antonio J.
Format: Article
Language:English
Subjects:
Ammonia
Carbonaceous materials
Catalytic activity
Chemical reduction
Chromium Oxide
Chromium oxides
Composite materials
Electrode kinetics
Exchanging
Graphene
Graphite
Heat treatment
Metal air batteries
Nanoparticles
RRDE
Zinc/air battery
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Summary:A series of chromium oxides (Cr2O3) nanoparticles supported on different carbonaceous material, namely: graphene, graphene oxide (GO) and graphite, were synthetized by precipitation of the salt precursors with precipitant (ammonia) and the subsequent thermal treatment. The catalytic activity of these composites and the Cr2O3 nanoparticles have been analysed by Koutecky-Levich (KL) and rotating ring-disc electrode methods and the results have been discussed following a model proposed here, which considers the O2 electrosorption as the rate determining step. Among them, graphite and graphene based composites have better catalytic activities and their behaviours agree with the proposed treatment: logarithm dependent of the intercept and nondependent slopes values of the KL plots with the potential. Cr2O3-graphite shows a mechanism interchanging 4 e-, which has been attributed to a graphite- Cr2O3 nanoparticles interaction. Besides, Cr2O3-graphite-based electrodes have been tested as cathode in a Zn/PVA-KOH/air battery, confirming its good properties to be applied as positive electrode in metal-air batteries.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2021.115441