Quantitative determination of dispersed platinum in carbon by cyclic voltammetry

Essalik, A.; Amouzegar, Kamyab; Savadogo, O.

doi:10.1007/bf00249660

Cited by 30 publications

(23 citation statements)

References 17 publications

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“…[48][49][50] Glassy carbon was used in some comparison measurements. The electrode ͑GC-30, Tokai, Ltd., Japan͒ was mechanically polished on separate felt polishing cloths using aqueous slurries of 1.0, 0.3, and 0.05 m diam deagglomerated alumina powder ͑Buehler, Ltd., Illinois͒.…”

Section: Methodsmentioning

confidence: 99%

Pulsed Galvanostatic Deposition of Pt Particles on Microcrystalline and Nanocrystalline Diamond Thin-Film Electrodes

Bennett

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Wang

et al. 2005

J. Electrochem. Soc.

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The pulsed galvanostatic deposition of nanometer-sized Pt particles on electrically conducting microcrystalline and nanocrystalline diamond thin-film electrodes is reported. The deposition was studied as a function of pulse number ͑10-50͒ and current density ͑0.50-1.50 mA cm −2 ͒ at the two morphologically different forms of diamond. The deposition of catalyst particles using ten 1 s pulses ͑duty cycle 50%͒ at a current density of 1.25 mA cm −2 ͑geometric area͒ produced the smallest nominal particle size and the highest particle coverage on both diamond surfaces. Secondary electron micrographs revealed metal particle deposition over much of the diamond surface, a nominal particle size of 43 ± 27 nm ͓relative standard deviation ͑RSD͒ = 63%͔ for microcrystalline and 25 ± 25 nm ͑RSD = 100%͒ for nanocrystalline diamond, and a nominal particle coverage of 7.5 ͑±0.9͒ ϫ 10 9 cm −2 for microcrystalline and 1.9 ͑±1.0͒ ϫ 10 10 cm −2 for nanocrystalline diamond. Deposition under these conditions resulted in the most efficient utilization of the metal catalyst for H + adsorption, based on the electrochemically active Pt area normalized to the estimated metal loading. Typical specific surface areas of 10-50 m 2 /g Pt were calculated, which compare favorably to values obtained at sp 2 electrodes, like carbon and graphite. The influence of the diamond electrode microstructural and electronic properties on the formation of dimensionally uniform metal adlayers is discussed.

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Section: Methodsmentioning

confidence: 99%

Pulsed Galvanostatic Deposition of Pt Particles on Microcrystalline and Nanocrystalline Diamond Thin-Film Electrodes

Bennett

Show

Wang

et al. 2005

J. Electrochem. Soc.

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“…Recently, it was shown that heteropolyacids can be suitably anchored on active carbon supports and used as catalysts in heterogeneous oxidation reactions [92]. Tungstic acid (H 2 WO 4 ) has been employed as a catalytic enhancer for Pt in phosphoric acid fuel cells by a simple blending procedure during electrode preparation [93]. This suggests that a novel route to increase the overall reaction rate could be based on the use of heteropoly-metallates as substrate species in conjunction with Pt-Ru catalysts.…”

Section: Heteropolyacids As Surface Promotersmentioning

confidence: 99%

DMFCs: From Fundamental Aspects to Technology Development

Aricò¹,

Srinivasan

Antonucci³

2001

Fuel Cells

1,453

884

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This review paper describes recent developments in both the fundamental and technological aspects of direct methanol fuel cells (DMFCs). Most previous studies in this field have dealt with fundamental aspects, whereas in recent years, the technology of these devices has become the object of significant interest. This is mainly due to the fact that a probable application of DMFCs in portable power sources and in hybrid electrical vehicles has only recently been envisaged. The section on fundamentals is particularly focused on the electrocatalysis of the methanol oxidation reaction and oxygen electroreduction. In this regard, particular relevance is given to the interpretation of the promoting effect on Pt of additional elements and some aspects of the electrocatalysis of oxygen reduction in the presence of methanol crossover have been treated. The technology section deals with the development of both components and devices. Particular emphasis is given to the development of high surface area electrocatalysts and alternative electrolyte membranes to Nafion, also the fabrication methodologies for the M&E assembly have been discussed. The last part of the paper describes the recent efforts in developing DMFC stacks for both portable and electro‐traction applications. The current status of the technology in this field is presented and some important technical and economical challenges are been discussed.

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“…Cyclic voltammetry (CV) experiments were carried out in a 0.5 mol L −1 H 2 SO 4 electrolyte, in the absence of oxygen, at a scan rate of 20 mV s −1 to evaluate the state of the surface [29][30][31].…”

Section: Electrochemical Studiesmentioning

confidence: 99%

Preparation and characterization of supported Pt–Ru catalysts with a high Ru content

Santos

Colmati

González

2006

Journal of Power Sources

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Quantitative determination of dispersed platinum in carbon by cyclic voltammetry

Cited by 30 publications

References 17 publications

Pulsed Galvanostatic Deposition of Pt Particles on Microcrystalline and Nanocrystalline Diamond Thin-Film Electrodes

Pulsed Galvanostatic Deposition of Pt Particles on Microcrystalline and Nanocrystalline Diamond Thin-Film Electrodes

DMFCs: From Fundamental Aspects to Technology Development

Preparation and characterization of supported Pt–Ru catalysts with a high Ru content

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