Impact of film drying procedures on RDE characterization of Pt/VC electrocatalysts

Garsany, Yannick; Singer, I. L.; Swider‐Lyons, Karen

doi:10.1016/j.jelechem.2011.09.016

Cited by 217 publications

(198 citation statements)

References 27 publications

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“…With the aim of increasing the uniformity of the catalyst film, a previously reported methodology was used [56,55,54]. With this method the dispersion containing the nanoparticles was dried while the electrode was rotated at 700 rpm for improving the dispersion of the catalyst.…”

Section: Discussionmentioning

confidence: 99%

“…With the aim of avoiding the agglomeration of nanoparticles and improving the quality of the deposit with better dispersion of the nanoparticles, Garsany and co-workers [54][55][56] proposed a different procedure for preparing the Pt nanoparticle deposit that gives reproducible Pt thin films with an increase in activity for the oxygen reduction reaction. This method uses a RDE glassy carbon tip rotating at 700 rpm as support for the deposit of the different samples of nanoparticles.…”

Section: Aggregation Effect In Ethanol Oxidationmentioning

confidence: 99%

See 1 more Smart Citation

Oxidation of ethanol on platinum nanoparticles: surface structure and aggregation effects in alkaline medium

Busó-Rogero

Solla-Gullón

Vidal‐Iglesias

et al. 2015

J Solid State Electrochem

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The ethanol oxidation reaction in 0.1 M NaOH on Pt nanoparticles with different shapes and loadings was investigated using electrochemical and spectroscopic techniques. The surface structure effect on this reaction was studied using well-characterized platinum nanoparticles. Regardless of the type of Pt nanoparticles used, results show that acetate is the main product with negligible CO2 formation. From the different samples used, the nanoparticles with a large amount (111) ordered domains have higher peak currents and a higher onset potential, in agreement with previous works with single crystal electrodes.In addition, spherical platinum nanoparticles supported on carbon with different loadings were used for studying possible diffusional problems of ethanol to the catalyst surface.The activity in these samples diminishes with the increase of Pt loading, due to diffusional problems of ethanol throughout the whole Pt nanoparticle layer, being the internal part of the catalyst layer inactive for the oxidation. To avoid this problem and prepare more dispersed nanoparticle catalyst layers, deposits were dried while the carbon support was rotated to favor the dispersion of the layer around the support. The improvement in the electrocatalytic activity for ethanol oxidation confirms the better performance of this procedure for depositing and drying.

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Section: Discussionmentioning

confidence: 99%

Section: Aggregation Effect In Ethanol Oxidationmentioning

confidence: 99%

Oxidation of ethanol on platinum nanoparticles: surface structure and aggregation effects in alkaline medium

Busó-Rogero

Solla-Gullón

Vidal‐Iglesias

et al. 2015

J Solid State Electrochem

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show abstract

“…By using this method, a reproducible and uniform film covering the entire glassy carbon surface was obtained. [23][24] Electrochemical measurements. Two different experimental set-ups were used for the electrochemical measurements.…”

Section: And Computational Methodsmentioning

confidence: 99%

An Aza-Fused π-Conjugated Microporous Framework Catalyzes the Production of Hydrogen Peroxide

et al. 2016

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ABSTRACT:The electrochemical production of hydrogen peroxide can be implemented in small-scale plants under "on demand" approach. For that, selective catalysts for the oxygen reduction reaction (ORR) towards the desired species are required. Here, we report about the synthesis, characterization, ORR electrochemical behavior and reaction mechanism of an aza-fused π-conjugated microporous polymer, which presents high selectivity towards hydrogen peroxide. It was synthesized by polycondensation of 1,2,4,5-benzenetetramine tetrahydrochloride and triquinoyl octahydrate. A cobaltmodified version of the material was also prepared by a simple post-synthesis treatment with a Co(II) salt. The characterization of the material is consistent with the formation of a conductive robust porous covalent laminar poly-aza structure. The ORR properties of these catalysts were investigated using rotating disk and rotating disk-ring arrangements. The results indicate that hydrogen peroxide is almost exclusively produced at very low overpotential values on these materials. Density functional theory calculations provide key elements to understand the reaction mechanism. It is found that, at the relevant potential for the reaction, half of the nitrogen atoms of the material would be hydrogenated. This hydrogenation process would destabilize some carbon atoms in the lattice and provides segregated charge. On the destabilized carbon atoms, molecular oxygen would be chemisorbed with the aid of charge transferred from the hydrogenated nitrogen atoms and solvation effects. Due to the low destabilization of the carbon sites, the resulting molecular oxygen chemisorbed state, which has the characteristics of a superoxide species, would be only slightly stable and would promote the formation of hydrogen peroxide.

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“…Major groups have reported using similar techniques in the literature and obtained fairly similar ORR activity results despite variations in the measurement protocol. 17,48,51,68,85,86 Figure S4 in Fig. S5 (SI).…”

Section: Nafion-based Stationary Air Dry (N-sad)mentioning

confidence: 99%

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Shinozaki

Zack

Pylypenko

et al. 2015

J. Electrochem. Soc.

245

191

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Platinum electrocatalysts supported on high surface area and Vulcan carbon blacks (Pt/HSC, Pt/V) were characterized in rotating disk electrode (RDE) setups for electrochemical area (ECA) and oxygen reduction reaction (ORR) area specific activity (SA) and mass specific activity (MA) at 0.9 V. Films fabricated using several ink formulations and film-drying techniques were characterized for a statistically significant number of independent samples. The highest quality Pt/HSC films exhibited MA 870 ± 91 mA/mg Pt and SA 864 ± 56 μA/cm 2 Pt while Pt/V had MA 706 ± 42 mA/mg Pt and SA 1120 ± 70 μA/cm 2 Pt when measured in 0.1 M HClO 4 , 20 mV/s, 100 kPa O 2 and 23 ± 2 • C. An enhancement factor of 2.8 in the measured SA was observable on eliminating Nafion ionomer and employing extremely thin, uniform films (∼4.5 μg/cm 2 Pt ) of Pt/HSC. The ECA for Pt/HSC (99 ± 7 m 2 /g Pt ) and Pt/V (65 ± 5 m 2 /g Pt ) were statistically invariant and insensitive to film uniformity/thickness/fabrication technique; accordingly, enhancements in MA are wholly attributable to increases in SA. Impedance measurements coupled with scanning electron microscopy were used to de-convolute the losses within the catalyst layer and ascribed to the catalyst layer resistance, oxygen diffusion, and sulfonate anion adsorption/blocking. The ramifications of these results for proton exchange membrane fuel cells have also been examined.

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Impact of film drying procedures on RDE characterization of Pt/VC electrocatalysts

Cited by 217 publications

References 27 publications

Oxidation of ethanol on platinum nanoparticles: surface structure and aggregation effects in alkaline medium

Oxidation of ethanol on platinum nanoparticles: surface structure and aggregation effects in alkaline medium

An Aza-Fused π-Conjugated Microporous Framework Catalyzes the Production of Hydrogen Peroxide

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

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