Formic acid electro-oxidation on carbon supported PdxPt1-x (0 ≥ x ≥ 1) nanoparticles synthesized via modified polyol method

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DOIResolve DOI: http://doi.org/10.1016/j.electacta.2009.12.090
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TypeArticle
Journal titleElectrochimica Acta
Volume55
Issue2010
Pages81828188; # of pages: 7
SubjectBimetallic nanoparticles; PdPt; Formic acid; Direct formic acid fuel cells; Electrocatalyst
AbstractCarbon supported nanoparticle catalysts of PdxPt1−x (0≥x≥1) were synthesized using a modified polyol method and poly(N-vinyl-2-pyrrolidone) (PVP) as a stabilizer. Resulting nanoparticles were characterized by X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and chronoamperommetry (CA) study for formic acid electro-oxidation. Surface composition of the synthesized nanoparticles found from XPS revealed the Pt surface segregation even for the Pd-rich compositions. It is suggested that the surface segregation behavior in PdPt nanoparticles supported on carbon may be influenced, in addition to the difference in Pd and Pt surface energies, by particle size and particle interaction with the support. According to CA, the carbon supported Pd nanoparticles show the highest initial activity towards formic acid electro-oxidation at the potential of 0.3V (RHE), due to the promotion of the direct dehydrogenation mechanism. However its stability is quite poor resulting in the fast deactivation of the Pd surface. Addition of Pt considerably improves the steady-state activity of Pd in 12 h CA experiment. CA measurements show that the most active catalyst is Pd0.5Pt0.5 of 4 nm size, which displays narrow size distribution and Pd to Pt surface atomic ratio of 27–73.
Publication date
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology; National Research Council Canada
Peer reviewedYes
NRC number52088
NPARC number17733594
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Record identifier22c939db-33df-497b-a853-806abb9a2e78
Record created2011-04-12
Record modified2016-05-09
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