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2020-01-30

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cc-by-nc-nd (c) Elsevier Ltd, 2020
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/170099

Electrochemical performance of carbon-supported Pt(Cu) electrocatalysts for low-temperature fuel cells

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https://doi.org/10.1016/j.ijhydene.2020.02.038

Abstract

Pt(Cu) nanoparticles supported on carbon nanofibers (CNFs), multi-walled carbon nanotubes (MWCNTs) and Vulcan carbon XC72, have been synthesized by electroless deposition and galvanic exchange. The structural analyses show contracted Pt fcc lattices due to the formation of a PtCu alloy core covered by a Pt-rich shell, mean crystallite sizes of about 3 nm, as well as good dispersion and carbon attachment. The electrochemical surface areas (ECSAs) of Pt(Cu)/CNF and Pt(Cu)/XC72 are comparable to those of commercial Pt/C and PtCu/C. The Pt(Cu) electrocatalysts show more negative onset potentials for CO oxidation than Pt/C and PtCu/C, thus indicating their greater CO tolerance. Pt(Cu)/CNF and Pt(Cu)/MWCNT present the highest mass activity and specific activity for the O2 reduction, respectively, both with better relative stability than Pt(Cu)/XC72. Pt(Cu)/CNF and Pt(Cu)/MWCNT are then considered good cathode catalysts, yielding estimated savings of about 50 wt.% Pt, when applied to low-temperature fuel cells.

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Oxidació, Electrocatàlisi

Subject (English)

Oxidation, Electrocatalysis

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Articles publicats en revistes (Ciència dels Materials i Química Física)

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GARCÍA CARDONA, Julia, et al. Electrochemical performance of carbon-supported Pt(Cu) electrocatalysts for low-temperature fuel cells. International Journal of Hydrogen Energy. 2020. Vol. 45, num. 40, pags. 20582-20593. ISSN 0360-3199. [consulted: 8 of August of 2026]. Available at: https://hdl.handle.net/2445/170099

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