Oxygen electrocatalysis on thin porous coating rotating platinum electrodes

Perez, Joelma; González, Ernesto Rafael; Ticianelli, Edson A.

doi:10.1016/s0013-4686(98)00255-2

Cited by 296 publications

(247 citation statements)

References 30 publications

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“…Similarly, more-negative slope values have been previously observed for some Au single-crystal electrodes [21,22] and Au/ C catalysts. [47] In addition, morenegative Tafel slope values due to the porosity of the catalyst have been obtained in case of thick catalyst layers, [77] however, in this work the catalyst loading was much lower and presumably the reaction was not limited by thin-layer diffusion, as confirmed for Au/C catalysts of various loadings. [47] Therefore, the precise reason for the higher value of slope is not clear at present, but it is expected to be related to the reaction kinetics and not to diffusion effects.…”

Section: Cyclic Voltammetry Of Au/c Catalystssupporting

confidence: 51%

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

et al. 2014

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Cubic, octahedral and quasi‐spherical (two different particle sizes) Au nanoparticles are synthesised and dispersed in a carbon‐black powder. The size and morphology of the Au nanocatalysts is confirmed by transmission electron microscopy and X‐ray diffraction. Au nanospheres are approximately 5 and 30 nm in diameter, whereas the size of Au octahedra and nanocubes is approximately 40–45 nm. The electrocatalytic activity of these carbon‐supported particles towards the oxygen reduction reaction (ORR) is studied in 0.5 M H2SO4 and 0.1 M KOH solutions by using the rotating‐disk‐electrode method. The specific activity (SA) for O2 reduction is measured, and the highest SA is observed for Au nanocubes supported on carbon. The highest mass activities are found for the smallest Au nanoparticles. Tafel analysis suggests that the mechanism of the ORR on shape‐controlled Au/C catalysts is the same as on bulk Au.

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Section: Cyclic Voltammetry Of Au/c Catalystssupporting

confidence: 51%

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

et al. 2014

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“…These results demonstrate that i P c is one of the most important factors in the control of the mean diameter of nanoparticles and therefore in the ECSA ; it does not depend on the Pt load in the support as claimed in the bibliography (Bergamaski et al, 2006;Geniès et al, 1998;Maillard, 2002;Nores-Pondal et al, 2009;Perez et al, 1998), at least between 10 and 40 % nominal loads. On the other hand, other factors in the control of the mean diameter of nanoparticles exist, such as the influence of PVP in the processes of nucleation and/or growth.…”

Section: Importance Of the Initial Concentration Of The Precursorsupporting

confidence: 73%

Size control of carbon-supported platinum nanoparticles made using polyol method for low temperature fuel cells

Favilla

Acosta

Schvezov

et al. 2013

Chemical Engineering Science

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Size control of carbon-supported platinum nanoparticles made using polyol method for low temperature fuel cells, Chemical Engineering Science, http://dx.doi.org/10.1016/j.ces. 2013.05.067 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe aim of this work is to present the results of the synthesis of Pt nanoparticles using the modified polyol method, using carbon black powder Vulcan XC-72R as a support. Two different techniques were used to synthesize the catalysts: a) fixing the initial concentration of the precursor (2 mM in H 2 PtCl 6 ) while adding the required amount of support to obtain different nominal loads of platinum; b) changing the initial concentration of the precursor to obtain altogether 10 wt.% nominal load of platinum. Catalysts were characterized using X-ray diffraction, transmission electron microscopy and cyclic voltammetry. The particles obtained ranged in sizes between 2.2 and 6.2 nm. These sizes were controlled by the initial concentration of the precursor. It has been found that the concentration of nanoparticles formed during synthesis was the same regardless of a) the initial concentration of the precursor and b) the amount of carbon support. In order to explain experimental results a new and simple statistical and geometrical treatment is used.

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“…When measuring with air, the low frequency semi-circle starts increasing again at high overpotential. This is due to insufficient diffusion of oxygen through the electrolyte film to the catalyst sides and is well described in literature [22,23]. At least two processes, one for each semi-circle are assumed: the low frequency arc is related to diffusion and the high frequency arc to charge transfer.…”

Section: Influence Of the Stoichiometry Of The Perovskitesmentioning

confidence: 93%

Combined platinum/perovskite catalyst for an efficient nanostructured air electrode

Thiele

2010

Materials Chemistry and Physics

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This work shows the stepwise improvement of air electrodes by the right combination of catalysts. In all electrodes carbon nanotubes serve as carbon support. The electrodes are produced by ultrasonic mixing of the carbon nanotubes and the catalysts. Their catalytic activity towards oxygen reduction in alkaline solution is evaluated by polarisation curves and electrochemical impedance spectroscopy. In a first step La 1−x Sr x MnO 3 perovskites are investigated, as well as La 0.65 Sr 0.35 MnO 3 and La 0.6 Sr 0.4 CoO 3 are compared. It is found that La 0.65 Sr 0.35 MnO 3 and La 0.6 Sr 0.4 CoO 3 have a positive impact on different parts of the current-potential curve. In a second step the influence of small amounts of platinum as an additional catalyst besides the perovskite is analyzed with the result that platinum lowers significantly the activation polarisation. Finally, the optimum composition of the electrode is found by using the synergetic effect of platinum, La 0.65 Sr 0.35 MnO 3 and La 0.6 Sr 0.4 CoO 3 .

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Oxygen electrocatalysis on thin porous coating rotating platinum electrodes

Cited by 296 publications

References 30 publications

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

Size control of carbon-supported platinum nanoparticles made using polyol method for low temperature fuel cells

Combined platinum/perovskite catalyst for an efficient nanostructured air electrode

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