Kinetics of methanol electrooxidation on Pt/C and PtRu/C catalysts

Díaz, Verónica; Ohanian, Mauricio; Zinola, C.F.

doi:10.1016/j.ijhydene.2010.07.135

Cited by 14 publications

(6 citation statements)

References 52 publications

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“…The D s is an effective amount of the fractional dimension and depicts the surface of the electrode physically . For a soft surface, D s = 2, and in a harsh electrode (such as Pt), D s < 2 which was reported by Solla and Diaz . The mechanism of alcohol's electrooxidation on the surface of harsh electrode is not organized due to the role of different functions like intermediate adsorption or mass transport.…”

Section: Resultsmentioning

confidence: 94%

“…59 For a soft surface, D s = 2, and in a harsh electrode (such as Pt), D s < 2 which was reported by Solla 60 and Diaz. 61 The mechanism of alcohol's electrooxidation on the surface of harsh electrode is not organized due to the role of different functions like intermediate adsorption or mass transport. Therefore, according to recent findings, simple Cottrell's equation cannot explain the chronoamperometric data that is related to oxidation of alcohols on the surface of Pd electrode and should be evaluated more carefully.…”

Section: Chronoamperometric Studiesmentioning

confidence: 99%

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Palladized dysprosium fluoride nanorods as a new performance catalyst in direct methanol fuel cell

Haghnegahdar

Noroozifar

2019

Int J Energy Res

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Summary Fuel cells are a new type of batteries that produce electricity from a continuous source of alcohols as long as fuel is inserted. In this study, decorated palladium nanoparticles (PdNPs) on dysprosium fluoride (DyF3) nanorods (DyFNRs)‐multiwalled carbon nanotubes (MWCNTs) were used for electrooxidation of methanol. DyFNRs were synthesized by the hydrothermal method, and the proposed multifunctional catalyst (DyFNRs/MWCNT‐PdNPs) was identified by several methods such as X‐ray diffraction, elemental mapping images, field emission scanning electron microscopy, energy dispersive analysis of X‐rays, and transmission electron microscopy which demonstrated a uniform distribution and high dispersion of the PdNPs on the supports. The electrocatalytic activity toward methanol electrooxidation on glassy carbon electrode (GCE) with DyFNRs/MWCNT‐PdNPs (DyFNRs/MWCNT‐PdNPs/GCE) was investigated by cyclic voltammetry (CV) and chronoamperometry (CA). Experimental results showed a high improvement in oxidation potential and peak current of methanol electrooxidation by DyFNRs/MWCNT‐PdNPs in comparison to DyFNRs and PdNPs. The values of the catalytic rate constant (k) and physical dimension (Ds) for methanol oxidation on the DyFNRs/MWCNT‐PdNPs/GCE catalyst were calculated 0.008 s−1 and 1.43, respectively. Moreover, the order of reaction was determined to be 0.43 and 0.13 for CH3OH and NaOH, repectively. Finally, the synthesized catalyst was evaluated in direct methanol fuel cell (DMFC). The single DMFC with proposed anodic catalyst, DyFNRs/MWCNT‐PdNPs, indicated a power density of 4.4 mW·cm−2 at a current density of 18 mA·cm−2 in alcohol (1 M) and NaOH (1 M).

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Section: Resultsmentioning

confidence: 94%

Section: Chronoamperometric Studiesmentioning

confidence: 99%

Palladized dysprosium fluoride nanorods as a new performance catalyst in direct methanol fuel cell

Haghnegahdar

Noroozifar

2019

Int J Energy Res

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“…Therefore, cheaper metals such Cu, Co, Fe, Ni … can be studied in the uses in the alloy and core-shell catalysts with the Pt shells for reducing the Pt loading [54,55]. The thermal cathodic treatments on Pt/C and Pt-Ru/C catalysts were used to enhance methanol electro-oxidation in sulfuric acid solution in electrochemical activation [56][57][58]. Clearly, Pt/support catalysts are preferred in many applications.…”

Section: Catalysts In Proton Exchange Membrane Fuel Cellmentioning

confidence: 99%

Novel Pt and Pd Based Core-Shell Catalysts with Critical New Issues of Heat Treatment, Stability and Durability for Proton Exchange Membrane Fuel Cells and Direct Methanol Fuel Cells

Long¹,

Thi²,

Ohtaki³

2012

Heat Treatment - Conventional and Novel Applications

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“…Table 1 gives indicatively the theoretical potentials and the half-reactions that take place for the cases full oxidation of the alcohols to CO2. Depending on numerous parameters (chemical composition and structure of electrocatalyst, pH, electrolyte concentration etc), several other reactions can take place leading to various intermediate products (CO, carbonates, acetic acid, acetone etc) [10][11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Overpotential analysis of alkaline and acidic alcohol electrolysers and optimized membrane-electrode assemblies

Sapountzi¹,

Palma

Zafeiropoulos

et al. 2019

International Journal of Hydrogen Energy

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Alcohol electrolysis using polymeric membrane electrolytes is a promising route for storing excess renewable energy in hydrogen, alternative to the thermodynamically limited water electrolysis. By properly choosing the ionic agent (i.e. H + or OH-) and the catalyst support, and by tuning the catalyst structure, we developed membrane-electrode-assemblies which are suitable for cost-effective and efficient alcohol electrolysis. Novel porous electrodes were prepared by Atomic Layer Deposition (ALD) of Pt on a TiO2-Ti web of microfibers and were interfaced to polymeric membranes with either H + or OHconductivity. Our results suggest that alcohol electrolysis is more efficient using OHconducting membranes under appropriate operation conditions (high pH in anolyte solution). ALD enables better catalyst utilization while it appears that the TiO2-Ti substrate is an ideal alternative to the conventional carbon-based diffusion layers, due to its open structure. Overall, by using our developmental anodes instead of commercial porous electrodes, the performance of the alcohol electrolyser (normalized per mass of Pt) can be increased up to ∼30 times.

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Kinetics of methanol electrooxidation on Pt/C and PtRu/C catalysts

Cited by 14 publications

References 52 publications

Palladized dysprosium fluoride nanorods as a new performance catalyst in direct methanol fuel cell

Palladized dysprosium fluoride nanorods as a new performance catalyst in direct methanol fuel cell

Novel Pt and Pd Based Core-Shell Catalysts with Critical New Issues of Heat Treatment, Stability and Durability for Proton Exchange Membrane Fuel Cells and Direct Methanol Fuel Cells

Overpotential analysis of alkaline and acidic alcohol electrolysers and optimized membrane-electrode assemblies

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