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Study of the kinetics and influence of Bi_irr on formic acid oxidation at Pt2Ru3/C

Samo za registrovane korisnike
2007
Autori
Tripković, Amalija
Gojković, Snežana Lj.
Popović, Ksenija
Lović, Jelena
Kowal, Andrzej
Članak u časopisu (Objavljena verzija)
,
Elsevier
Metapodaci
Prikaz svih podataka o dokumentu
Apstrakt
Electrochemical oxidation of HCOOH in H2SO4 and HClO4 solutions was examined on thin film Pt2Ru3/C electrode. XRD pattern revealed that Pt2Ru3 alloy consisted of the solid solution of Ru in Pt and the small amount of Ru or solid solution of Pt in Ru. According to STM images, Pt2Ru3 particles size was between 2 and 6 nm. It was established that electrochemical oxidation of HCOOH commenced at −0.1 V versus SCE at Pt sites in the catalyst. Kinetic parameters indicated that dehydrogenation path was predominant. Dehydration occurs in parallel, but without significant poisoning by COad owing to oxidative removal by OH species on Ru atoms. The coverage of Pt2Ru3 surface by CO preadsorbed from the solution was found to be 24% lower when the surface was modified by irreversibly adsorbed Bi. Modification by Bi also shifted the onset potential for HCOOH oxidation for about 50 mV towards more negative values and consequently, increased the reaction rate for a factor of two. It was proposed that Ru... acts through bifunctional mechanism, i.e. OH species adsorbed on Ru oxidizes COad from Pt sites, while Bi hinders the adsorption of CO on Pt sites via electronic and/or ensemble effects.

Ključne reči:
Formic acid / Electrochemical oxidation / Platinum-ruthenium / Bismuth / Supported nanocatalyst / Fuel cells
Izvor:
Electrochimica Acta, 2007, 53, 887-893
Izdavač:
  • Elsevier
Projekti:
  • Novi materijali za primenu u gorivim spregovima sa polimernom membranom (RS-142056)

DOI: 10.1016/j.electacta.2007.07.073

ISSN: 0013-4686

WoS: 000251480900081

Scopus: 2-s2.0-35148896864
[ Google Scholar ]
26
25
URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2881
Kolekcije
  • Radovi istraživača / Researchers' publications
Institucija
IHTM

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