Pd/MnO2 as a bifunctional electrocatalyst for potential application in alkaline fuel cells

[Display omitted] The Pd loading of Pd/MnO2 electrocatalysts was studied to evaluate the performance and the mechanism for the oxygen reduction reaction (ORR) and the hydrogen oxidation reaction (HOR) in aqueous electrolyte, as a model of cathodic and the anodic reactions that take place in anionic...

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Published in:Fuel (Guildford) 2020-11, Vol.279, p.118470, Article 118470
Main Authors: Cruz-Reyes, I., Trujillo-Navarrete, B., García-Tapia, K., Salazar-Gastélum, M.I., Paraguay-Delgado, F., Félix-Navarro, R.M.
Format: Article
Language:English
Subjects:
Aqueous electrolytes
Bifunctional electrocatalyst
Catalysis
Catalysts
Catalytic activity
Catalytic converters
Chemical reduction
Electrocatalysts
Electrolytic cells
Fuel cells
Fuel technology
Hydrogen oxidation reaction
Manganese dioxide
MnO2
Nanorods
Oxidation
Oxygen reduction reaction
Oxygen reduction reactions
Parameters
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Summary:[Display omitted] The Pd loading of Pd/MnO2 electrocatalysts was studied to evaluate the performance and the mechanism for the oxygen reduction reaction (ORR) and the hydrogen oxidation reaction (HOR) in aqueous electrolyte, as a model of cathodic and the anodic reactions that take place in anionic exchange membrane fuel cells (AEMFC). Regarding the ORR, it was stated that the pure MnO2 nanorods showed catalytic activity towards it. However, the increase in Pd loading enhanced the catalytic kinetic parameter such as Eonset, E1/2, Jlim, and k. Moreover, the Koutecky-Levich analysis exhibited that the ORR process takes place via 4 electrons transferred. Conversely, pure MnO2 nanorods do not show catalytic activity towards HOR; Pd/MnO2 from to 1%Pd loading exhibited catalytic activity, the kinetic parameters were enhanced as Pd loading increases. In both cases, the rate-determining step (RDS) of the ORR and HOR evolved according to the Pd loading. Based on the findings of this research we can establish that Pd/MnO2 catalysts are an excellent option in the catalysis of the ORR and HOR, exhibiting potential application in AEMFC.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2020.118470