Pt–Ru catalysts supported on carbon xerogels for PEM fuel cells

Calderón, Juan Carlos; Mahata, Nagendranath; Pereira, M.F.R.; Figueiredo, José L.; Fernandes, Vitor R.; Rangel, C. M.; Calvillo, Laura; Lázaro, M.J.; Pastor, E.

doi:10.1016/j.ijhydene.2011.12.029

Cited by 45 publications

(25 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A negative shift of this onset potential indicates an enhanced catalytic activity for CO oxidation. This has been extensively reported for PtRu catalysts [18,20,21]. In the case of Pt-transition metal oxide based catalysts this effect can also be observed [14].…”

Section: Electro-chemical Characterizationsupporting

confidence: 56%

“…X-ray spectra exhibited the characteristic peaks corresponding to the Pt face-centered cubic (fcc) polycrystalline structure (111, 200, 220 and 311 reflection planes), consistent with the XRD pattern of JCPDS card #00-4-0802 (2θ = 39.76°, 46.24°, 67.45°, 81.28°). A signal near to 25° (2θ) was obtained, which corresponds to the (002) graphite basal planes for Pt/C and PtRu/C [18]. This peak is not appreciable on Pt/C-MnxO1+x because of the high manganese oxides content.…”

Section: Physical-chemical Characterizationmentioning

confidence: 93%

“…During electro-oxidation of MeOH, strongly adsorbed carbonaceous species inhibit further adsorption of MeOH on the catalyst surface, which causes a positive shift in the onset potential and a decrease in the current at a specific potential. Therefore, the more the forward scan peak is shifted to negative potentials, the greater the promotion effect of the electro-catalyst [18]. The forward peak potentials for the Pt/C-MnxO1+x, Pt/C and PtRu/C catalysts obtained from the CV are shown in Table 1.…”

Section: Electro-chemical Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

et al. 2015

View full text Add to dashboard Cite

Platinum (Pt) nanoparticles are deposited on a hybrid support (C-MnO2) according to a polyol method. The home-made catalyst, resulted as Pt/C-MnxO1+x, is compared with two different commercial platinum based materials (Pt/C and PtRu/C). The synthesized catalyst is characterized by means of FESEM, XRD, ICP-MS, XPS and μRS analyses. MnO2 is synthesized and deposited over a commercial grade of carbon (Vulcan XC72) by facile reduction of potassium permanganate in acidic solution. Pt nanoparticles are synthesized on the hybrid support by a polyol thermal assisted method (microwave irradiation), followed by an annealing at 600 °C. The obtained catalyst displays a support constituted by a mixture of manganese oxides (Mn2O3 and Mn3O4) with a Pt loading of 19 wt. %. The electro-catalytic activity towards MOR is assessed by RDE in acid conditions (0.5 M H2SO4), evaluating the ability to oxidize methanol in 1 M concentration. The synthesized Pt/C-MnxO1+x catalyst shows good activity as well as good stability compared to the commercial Pt/C based catalyst.

show abstract

Section: Electro-chemical Characterizationsupporting

confidence: 56%

Section: Physical-chemical Characterizationmentioning

confidence: 93%

Section: Electro-chemical Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The role of carbon materials as support for catalysts in all the categories of polymer electrolyte membrane fuel cells is well known, and is related with different factors: (1) enhancement of high electroactive area, caused by a better dispersion of nanoparticles [17]; (2) improved electroactive species diffusion through the porous structure of carbon support [17]; and (3) promotion of the electronic transfer, either for the presence of surface functional groups or the decrease in Fermi level of the catalysts [18]. Therefore, a way for increasing the activity of catalysts is upgrading the electrical and morphological properties of carbon supports, a fact applied for both Pt-based and non Pt-based electrocatalysts.…”

Section: Carbon-supported Pd-alloysmentioning

confidence: 99%

Palladium-Based Catalysts as Electrodes for Direct Methanol Fuel Cells: A Last Ten Years Review

2016

View full text Add to dashboard Cite

Platinum-based materials are accepted as the suitable electrocatalysts for anodes and cathodes in direct methanol fuel cells (DMFCs). Nonetheless, the increased demand and scarce world reserves of Pt, as well as some technical problems associated with its use, have motivated a wide research focused to design Pd-based catalysts, considering the similar properties between this metal and Pt. In this review, we present the most recent advancements about Pd-based catalysts, considering Pd, Pd alloys with different transition metals and non-carbon supported nanoparticles, as possible electrodes in DMFCs. In the case of the anode, different reported works have highlighted the capacity of these new materials for overcoming the CO poisoning and promote the oxidation of other intermediates generated during the methanol oxidation. Regarding the cathode, the studies have showed more positive onset potentials, as fundamental parameter for determining the mechanism of the oxygen reduction reaction (ORR) and thus, making them able for achieving high efficiencies, with less production of hydrogen peroxide as collateral product. This revision suggests that it is possible to replace the conventional Pt catalysts by Pd-based materials, although several efforts must be made in order to improve their performance in DMFCs.

show abstract

“…This is because the activity of the catalyst is not the only important factor in the construction of a rechargeable air electrode: the interaction of the catalyst with the supporting layers of the electrode and the current collector, and the efficiency of oxygen transport to the catalyst through the gas diffusion layer, are also of importance. For instance, catalysts which appear to have a strong performance on a solid glassy carbon or gold RDE may not have such high activity when adsorbed onto high surface area gas diffusion layer [24].…”

Section: Introductionmentioning

confidence: 99%

A nanostructured bifunctional Pd/C gas-diffusion electrode for metal-air batteries

McKerracher

Alegre

Baglio

et al. 2015

Electrochimica Acta

View full text Add to dashboard Cite

Keywords:bifunctional air electrode palladium catalyst metal-air battery A B S T R A C T Designing a bifunctional air electrode which catalyses both the oxygen reduction and oxygen evolution reactions is an essential part of progress towards fully rechargeable metal-air batteries, such as the ironair battery which is environmentally friendly, low cost, and does not suffer risk of thermal runaway like lithium-ion batteries. This paper reports the development of a lightweight carbon-based bifunctional air electrode, catalysed by a small (0.5 mg cm À2 ) loading of 30 wt.% palladium on carbon. The Pd-catalysed air electrode showed good bifunctional activity, with 0.53 V potential difference between oxygen reduction and evolution. The Pd/C air electrode showed improved catalytic activity at high current densities (! 50 mA cm À2) and enhanced durability compared with two commercial Pt/C air electrodes produced by Gaskatel GmbH and Johnson Matthey. A stable oxygen evolution potential was maintained over 1,000 charge-discharge cycles.Crown

show abstract

Pt–Ru catalysts supported on carbon xerogels for PEM fuel cells

Cited by 45 publications

References 55 publications

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

Palladium-Based Catalysts as Electrodes for Direct Methanol Fuel Cells: A Last Ten Years Review

A nanostructured bifunctional Pd/C gas-diffusion electrode for metal-air batteries

Contact Info

Product

Resources

About