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Title: Re-examination of the Pt Particle Size Effect on the Oxygen Reduction Reaction for Ultrathin Uniform Pt/C Catalyst Layers without Influence from Nafion

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
OSTI Identifier:
1399611
Grant/Contract Number:
AC36-08-GO28308
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Electrochimica Acta
Additional Journal Information:
Journal Volume: 213; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-15 19:06:52; Journal ID: ISSN 0013-4686
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Shinozaki, Kazuma, Morimoto, Yu, Pivovar, Bryan S., and Kocha, Shyam S. Re-examination of the Pt Particle Size Effect on the Oxygen Reduction Reaction for Ultrathin Uniform Pt/C Catalyst Layers without Influence from Nafion. United Kingdom: N. p., 2016. Web. doi:10.1016/j.electacta.2016.08.001.
Shinozaki, Kazuma, Morimoto, Yu, Pivovar, Bryan S., & Kocha, Shyam S. Re-examination of the Pt Particle Size Effect on the Oxygen Reduction Reaction for Ultrathin Uniform Pt/C Catalyst Layers without Influence from Nafion. United Kingdom. doi:10.1016/j.electacta.2016.08.001.
Shinozaki, Kazuma, Morimoto, Yu, Pivovar, Bryan S., and Kocha, Shyam S. 2016. "Re-examination of the Pt Particle Size Effect on the Oxygen Reduction Reaction for Ultrathin Uniform Pt/C Catalyst Layers without Influence from Nafion". United Kingdom. doi:10.1016/j.electacta.2016.08.001.
@article{osti_1399611,
title = {Re-examination of the Pt Particle Size Effect on the Oxygen Reduction Reaction for Ultrathin Uniform Pt/C Catalyst Layers without Influence from Nafion},
author = {Shinozaki, Kazuma and Morimoto, Yu and Pivovar, Bryan S. and Kocha, Shyam S.},
abstractNote = {},
doi = {10.1016/j.electacta.2016.08.001},
journal = {Electrochimica Acta},
number = C,
volume = 213,
place = {United Kingdom},
year = 2016,
month = 9
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.electacta.2016.08.001

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • The platinum 'particle size effect' on the oxygen reduction reaction (ORR) has been re-evaluated using commercial Pt/C catalysts (2-10 nm Pt particle) and polycrystalline Pt (poly-Pt) in 0.1 M HClO4 with a rotating disk electrode method. Nafion-free catalyst layers were employed to obtain specific activities (SA) that were not perturbed (suppressed) by sulfonate anion adsorption/blocking. By using ultrathin uniform catalyst layers, O2 diffusion limitation was minimized as confirmed from the high SAs of our supported catalysts that were comparable to unsupported sputtered Pt having controlled sizes. The specific activity (SA) steeply increased for the particle sizes in the range -2-10more » nm (0.8-1.8 mA/cm2Pt at 0.9 V vs. RHE) and plateaued over -10 nm to 2.7 mA/cm2Pt for bulk poly-Pt. On the basis of the activity trend for the range of particle sizes studied, it appears that the effect of carbon support on activity is negligible. The experimental results and the concomitant profile of SA vs. particle size was found to be in an agreement to a truncated octahedral particle model that assumes active terrace sites.« less
  • A 2% Pt-1% H{sub 2}WO{sub 4}-based electrocatalyst has been fabricated by an inexpensive chemical route for use as an oxygen cathode in 99% phosphoric acid at 180C. The effect of the platinum particle size on the electrode performance for the oxygen reduction reaction (ORR) was studied. The electrocatalytic properties for the ORR, e.g., exchange current density, mass activity, and specific activity of a 2% Pt-1% H{sub 2} WO{sub 4}-based electrode fabricated from 5% pt, were found to be several times higher than those of 10% Pt-based electrocatalysts. It was shown that the performance of this electrode is not related tomore » an increase in its electrochemically active surface area, but to its chemical composition. Based on the concept of synergistic process of the ORR on materials the authors have previously emphasized, it is shown that a 2% Pt-1% H{sub 2} WO{sub 4}-based electrocatalyst is a synergistic system due to an increase of the active sites at the electrocatalyst surface.« less
  • Commercially available nanoparticle platinum on high surface area carbon black (Pt/HSC) electrocatalysts were characterized in rotating disk electrode (RDE) setups using varying ink formulations and film drying techniques in an attempt to obtain thin, uniform films and reproducible activity. Electrodes prepared from Nafion-free inks that were dried under an isopropyl alcohol (IPA) atmosphere produced uniform, thin films at low electrocatalyst loadings of ~4.5 mg/cm 2 Pt. These Nafion-free/IPA-dried electrodes were found to exhibit oxygen reduction reaction (ORR) activities higher than conventional Nafion-based/Air-dried electrodes by a factor of ~2.8. The magnitude of mass and specific activities were determined to be imore » m ~771 ±56 mA/mgPt and i s~812 ±59 mA/cm 2Pt respectively and appear to be the highest values reported for RDE measurements on Pt/HSC in 0.1M HClO 4 at 20 mV/s and 25°C. Electrochemical diagnostics including ORR I-V profiles, cyclic voltammograms and electrochemical impedance spectroscopy (EIS) studies were conducted to investigate the thin film Pt/HSC electrodes and correlate results to film morphology and electrochemical activity.« less
  • Monodisperse Pt{sub 3}Co nanoparticles with size controlled from 3 to 9 nm have been synthesized through an organic solvothermal approach and applied as electrocatalysts for the oxygen reduction reaction. Electrochemical study shows that the Pt{sub 3}Co nanoparticles are highly active for the oxygen reduction reaction and the activity is size-dependent. The optimal size for maximal mass activity was established to be around 4.5 nm by balancing the electrochemically active surface area and specific activity.