Microwave assisted synthesis of ruthenium electrocatalysts for oxygen reduction reaction in the presence and absence of aqueous methanol

Borja-Arco, E.; Sandoval, O. Jiménez; Escalante, Jaime; Sandoval-González, Antonia; Sebastian, P.J.

doi:10.1016/j.ijhydene.2010.10.051

Cited by 17 publications

(16 citation statements)

References 25 publications

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“…For this reason the study focused on the activity of a range of Ru/ N-CNTs materials. Three distinct characteristic region of ORR processes that take place on the surface of the catalyst can be seen: (i) the kinetic region (E < -0.45), where the current is independent of the rotation velocity; (ii) the mixed control region (-0.45 < E < -0.25), where kinetics and the diffusion processes determine the behavior; (iii) the mass transfer region (E > -0.25), where the diffusion current is a function of the rotation velocity [6,34]. All the prepared catalysts showed activity toward the ORR in alkaline electrolyte.…”

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Ruthenium Supported on Nitrogen‐Doped Carbon Nanotubes for the Oxygen Reduction Reaction in Alkaline Media

et al. 2012

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Nitrogen‐doped carbon nanotubes (N‐CNTs) prepared via thermal chemical vapor deposition (CVD), were used to support ruthenium (Ru) nanoparticles made using a microwave assisted reduction technique. The amount of Ru deposited on N‐CNTs was varied between 0 and 10 wt.%. The activity of the prepared nanocatalysts toward the oxygen reduction reaction (ORR) was characterized using the rotating disk electrode and voltammetry techniques. The ORR activity was higher at lower concentrations of Ru on N‐CNTs. The four electron pathway of ORR is more favorable on 2Ru/N‐CNTs and 5Ru/N‐CNTs than 10Ru/N‐CNTs.

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Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Ruthenium Supported on Nitrogen‐Doped Carbon Nanotubes for the Oxygen Reduction Reaction in Alkaline Media

et al. 2012

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“…The osmium electrocatalysts were synthesized using 0.063 mmol of triosmium dodecacarbonyl (Os 3 (CO) 12 , Aldrich), which was mixed with 5 mL of 1,2-dichlorobenzene (b.p. 178-180…”

Section: Synthesis and Structuralmentioning

confidence: 99%

“…CV and LSV curves were also performed in the presence of methanol (2.0 mol L −1 ), under the same conditions described above. Figure 1 shows the FT-IR spectra of the precursor Os 3 (CO) 12 , as well as those of the osmium electrocatalysts prepared. The precursor shows strong carbonyl stretching vibration bands around 2040 cm −1 , as well as a group of bands around 570 cm, which have been assigned to carbonyl deformation modes, δ M-CO [13].…”

Section: Linear Sweep Voltammetry (Lsv)mentioning

confidence: 99%

“…Figure 3 shows the corresponding XRD patterns of Os 3 (CO) 12 precursor and the osmium catalysts synthesized. The products show some very broad crystallographic peaks at low angular values , indicating the small size of the particles.…”

Section: Structural Characterizationmentioning

confidence: 99%

“…These reactions include organic and inorganic syntheses, selective sorption, oxidations/reductions, and polymerizations, among many other processes [11]. Our research group has reported the synthesis of ruthenium catalysts using microwave irradiation, the materials obtained showing electrocatalytic properties similar to those of materials synthesized by a conventional method [12]. In this paper, a rapid synthesis method based on microwave heating for preparing osmium electrocatalysts with potential as DMFC cathodes is presented.…”

Section: Introductionmentioning

confidence: 99%

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

Borja-Arco¹,

Jiménez‐Sandoval

Escalante-García

et al. 2011

International Journal of Electrochemistry

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Osmium electrocatalysts for the oxygen reduction reaction (ORR) were prepared by microwave irradiation of Os 3 (CO) 12 at different experimental conditions. The materials obtained were structurally characterized by FT-IR, micro-Raman spectroscopy and X-ray diffraction. Their chemical compositions were obtained by EDS. The electrocatalytic properties for the oxygen reduction reaction were evaluated by rotating disk electrode measurements in 0.5 mol L −1 H 2 SO 4 , in the absence and presence of aqueous methanol. The kinetic parameters, such as Tafel slope, exchange current density, and charge transfer coefficient are reported.

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Microwave‐Assisted Solvothermal One‐Pot Synthesis of RuO₂ Nanoparticles: First Insights of Its Activity Towards Oxygen and Chlorine Evolution Reactions

et al. 2018

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A microwave-assisted solvothermal method is proposed as a rapid and low-cost fabrication procedure of RuO 2 nanoparticles using citric acid as stabilizing agent in ethylene glycol, and H 2 O 2 as oxidizing agent at 180°C. Structural and morphological characterizations of the powder are investigated using X-Ray diffraction (XRD), scanning electronic microscopy (SEM) and transmission electron microscopy (TEM). XRD analysis shows that there is a synergic effect to obtain RuO 2 nanoparticles when 6% v/v H 2 O 2 is added followed by a calcination of the powder, due to reactive oxygen intermediates ( 1 O 2 , HO À 2 , HO * 2 , * OH) generated in the first stage. TEM and SEM images of assynthesized material exhibit an uniform particle distribution (PSD) of RuO 2 nanoparticles with averaged diameter of ca. 38 nm, and its indexing indicates the RuO 2 stoichiometry with high degree of crystallinity. The preliminary electrocatalytic performance of RuO 2 nanoparticles coated on Ti is investigated using voltammetry and electrochemical impedance spectroscopy (EIS), towards the oxygen (OER) and chlorine evolution reaction (CER) in 1 mol L À 1 H 2 SO 4 and 0.1 mol L À 1 NaCl, respectively. Cyclic voltammograms of RuO 2 display typical behaviors for OER and CER at 1.25 and 1.1 V vs Ag/AgCl, respectively. A Tafel slope of 44 mV dec À 1 corrected for ohmic drop was obtained in sulfate media which confirmed the OER mechanism in the absence of chlorides; while this parameter is around 25 mV dec À 1 in NaCl (CER), strongly depending on the chloride concentration and the extent of OER input. In NaCl media, the energy barriers represented by the charge transfer resistances for CER are overcome at more positive potentials than for OER, and a greater activity of the O 2 evolution is observed as the potential became more positive.

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Microwave assisted synthesis of ruthenium electrocatalysts for oxygen reduction reaction in the presence and absence of aqueous methanol

Cited by 17 publications

References 25 publications

Ruthenium Supported on Nitrogen‐Doped Carbon Nanotubes for the Oxygen Reduction Reaction in Alkaline Media

Ruthenium Supported on Nitrogen‐Doped Carbon Nanotubes for the Oxygen Reduction Reaction in Alkaline Media

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

Microwave‐Assisted Solvothermal One‐Pot Synthesis of RuO₂ Nanoparticles: First Insights of Its Activity Towards Oxygen and Chlorine Evolution Reactions

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Microwave assisted synthesis of ruthenium electrocatalysts for oxygen reduction reaction in the presence and absence of aqueous methanol

Cited by 17 publications

References 25 publications

Ruthenium Supported on Nitrogen‐Doped Carbon Nanotubes for the Oxygen Reduction Reaction in Alkaline Media

Ruthenium Supported on Nitrogen‐Doped Carbon Nanotubes for the Oxygen Reduction Reaction in Alkaline Media

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

Microwave‐Assisted Solvothermal One‐Pot Synthesis of RuO2 Nanoparticles: First Insights of Its Activity Towards Oxygen and Chlorine Evolution Reactions

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Microwave‐Assisted Solvothermal One‐Pot Synthesis of RuO₂ Nanoparticles: First Insights of Its Activity Towards Oxygen and Chlorine Evolution Reactions