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An electrochemical impedance spectroscopy study of polymer electrolyte membrane fuel cells electrocatalyst single wall carbon nanohorns-supported

TitoloAn electrochemical impedance spectroscopy study of polymer electrolyte membrane fuel cells electrocatalyst single wall carbon nanohorns-supported
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2011
AutoriBrandão, L., Boaventura M., Passeira C., Mirabile Gattia Daniele, Marazzi R., Antisari M.V., and Mendes A.
RivistaJournal of Nanoscience and Nanotechnology
Volume11
Paginazione9016-9024
ISSN15334880
Parole chiaveAcid solutions, Acid treatments, Carbon black, Cathode electrodes, Cathodes, Electrocatalyst support, Electrocatalysts, Electrochemical impedance spectroscopy, Electrolytes, Electromagnetic Fields, Fuel cells, Hydrophobic character, Inner tubes, Nanohorns, Oxidizing treatment, Oxygen, Oxygen flow, Oxygen treatment, Platinum, Proton exchange membrane fuel cells (PEMFC), Pt nanoparticles, Single Wall, Single wall carbon nanohorn, Surface area, SWNH
Abstract

Electrochemical impedance spectroscopy (EIS) was used to study the polymer electrolyte membrane fuel cells (PEMFC) performance when using single wall carbon nanohorns (SWNH) to support Pt nanoparticles. Additionally, as-prepared and oxidized SWNH Pt-supports were compared with conventional carbon black. Two different oxidizing treatments were considered: oxygen flow at 500 C and reflux in an acid solution at 85 C. Both oxidizing treatments increased SWNH surface area; oxygen treatment increased surface area 4 times while acid treatment increased 2.6 times. The increase in surface area should be related to the opening access to the inner tube of SWNH. Acid treatment of SWNH increased chemical fragility and decreased electrocatalyst load in comparison with as-prepared SWNH. On the other hand, the oxygen treated SWNH sample allowed to obtain the highest electrocatalyst load. The use of as-prepared and oxygen treated SWNH showed in both cases catalytic activities 60% higher than using conventional carbon black as electrocatalyst support in PEMFC. Moreover, EIS analysis indicated that the major improvement in performance is related to the cathode kinetics in the as-prepared SWNH sample, while concerning the oxidized SWNH sample, the improvements are related to the electrokinetics in both anode and cathode electrodes. These improvements should be related with differences in the hydrophobic character between SWNH and carbon black. Copyright © 2011 American Scientific Publishers. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84857150123&doi=10.1166%2fjnn.2011.3466&partnerID=40&md5=6582cf24499d99083ac6c0ca05d130dd
DOI10.1166/jnn.2011.3466
Citation KeyBrandão20119016