Microwave Assisted Synthesis of Osmium Electrocatalysts for the Oxygen Reduction Reaction in the Absence and Presence of Aqueous Methanol

Borja-Arco, E.; Jiménez‐Sandoval, O.; Escalante-García, Jaime; Magallón-Cacho, Lorena; Sebastián, P.J.

doi:10.4061/2011/830541

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…Recently there has been an interest in synthesizing electrocatalysts for PMFCs using a microwave thermal treatment. For example, PtRu/Carbon nanocomposite as anode in a direct methanol fuel cell (DMFC) [14]; CoSe [15], Ru [16], Os [17] and CoFeRu [18] electrocatalysts for the ORR; and Ru for the HOR [19] have been reported, but the use of organic solvents as reaction media remains. On the other hand, Sandoval et al have reported the synthesis of CoFeRu electrocatalyst using an organic solvent [18] compared with H 2 O [20] as microwave absorbing media, and they found a better electrocatalytic behavior for the ORR when the material is synthesized using H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Microwave assisted synthesis of metallic Ru for the HOR and ORR

Bernal-Lopez

Selva-Ochoa

Borja-Arco

et al. 2020

Mater. Res. Express

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Metallic ruthenium electrocatalyst with activity for the hydrogen oxidation reaction and the oxygen reduction reaction has been synthesized by microwave irradiation at 180°C in deionized water as reaction media. Characterization of the material by ATR-FTIR spectroscopy shows a complete decarbonylation of the precursor Ru 3 (CO) 12 with formation of metallic Ru, which is confirmed by the corresponding x-ray diffraction analysis. Evaluation of the material's electrocatalytic properties by the rotating disk electrode technique in 0.5 mol l −1 allows the study of hydrogen oxidation and oxygen reduction reaction using linear sweep voltammetry, exhibiting that the diffusional processes of H 2 and O 2 can be improved by modifying the electrocatalytic ink preparation.

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Section: Introductionmentioning

confidence: 99%

Microwave assisted synthesis of metallic Ru for the HOR and ORR

Bernal-Lopez

Selva-Ochoa

Borja-Arco

et al. 2020

Mater. Res. Express

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“…On the other hand, Figure 7 d shows the mass-corrected Tafel plots for the ORR in the absence and presence of methanol for the non-activated ink and in its absence for the activated one. Through analysis, electrokinetic parameters were obtained and are summarized in Table 5 in conjunction with the OCP values for the OsRu electrocatalyst and the parameters reported in the literature for the mono [ 30 , 31 ] and bimetallic materials [ 13 ]. It can be observed that the OCPs are quite near one another, being slightly higher for the new electrocatalyst with CV before ORR study.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2021

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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 was 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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“…use of Ni-Ir and Ni-Os bimetallic NP alloys for hydrogenation reactions [48], Os NPs for CO oxidation [49,50], and Os NP electro-catalysts for PEM fuel cells [51] and direct methanol fuel cells [52].…”

Section: Osmium (Os)mentioning

confidence: 99%