Hydrogen Oxidation and Oxygen Reduction Reactions on an OsRu-Based Electrocatalyst Synthesized by Microwave Irradiation

This work presents an OsRu-based electrocatalyst synthesis, by a rapid and efficient method through microwave irradiation. The outstanding electrocatalyst shows a dual catalytic activity, demonstrating both: hydrogen oxidation and oxygen reduction reactions. The material is structural and morphologi...

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Published inMaterials Vol. 14; no. 19; p. 5692
Main Authors Selva-Ochoa, Ángela, Su-Gallegos, Javier, Sebastian, Pathiyammattom Joseph, Magallón-Cacho, Lorena, Borja-Arco, Edgar
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 30.09.2021
MDPI
Subjects
bimetallic electrocatalysts
Carbon
Catalytic activity
Cathodes
Contaminants
Crystallites
Electrocatalysts
Electrochemical analysis
Electrode polarization
Electrodes
Electrolytes
Electrolytic cells
Fourier transforms
Hydrogen
hydrogen oxidation
Irradiation
Methanol
Methods
microwave synthesis
Morphology
Nanoparticles
Oxidation
oxygen reduction
Oxygen reduction reactions
Proton exchange membrane fuel cells
Rotating disks
Solvents
Spectrum analysis
Structural analysis
Sulfuric acid
Voltammetry
Mexico
United States > US
Madrid Spain
Spain
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Summary:This work presents an OsRu-based electrocatalyst synthesis, by a rapid and efficient method through microwave irradiation. The outstanding electrocatalyst shows a dual catalytic activity, demonstrating both: hydrogen oxidation and oxygen reduction reactions. The material is structural and morphologically characterized by FT-IR, X-ray diffraction, EDS, and SEM, indicating nanoparticulated Os and Ru metallic phases with a crystallite size of ∼6 nm, calculated by the Scherrer equation. The metal nanoparticles are apparently deposited on a carbonaceous sponge-like morphology structure. Its electrochemical characterization is performed in 0.5 M H2SO4 by the rotating disk electrode technique, employing cyclic and linear sweep voltammetry. Two different ink treatments have been studied to improve the obtained polarization curves. The material is also tested in the presence of methanol for the oxygen reduction reaction, showing an important resistance to this contaminant, making it viable for its use in direct methanol fuel cells (DMFCs) as a cathode and in polymer electrolyte fuel cells (PEMFCs) as an anode as much as a cathode.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma14195692