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Issue 2, 2009
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Formic acid electrooxidation on Bi-modified polyoriented and preferential (111) Pt nanoparticles

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Abstract

Formic acid electrooxidation was studied on Bi modified polyoriented and preferential (111) Pt nanoparticles. For both types of nanoparticles, Bi coverage was progressively increased and its effect on formic acid electrooxidation was evaluated using cyclic voltammetry and chronoamperometric measurements. In both experiments, significant and progressive enhancements on the electrooxidation current densities were obtained in comparison to the bare Pt nanoparticles. In voltammetry, at maximum Bi coverage, higher current densities at peak potential were obtained with the preferential (111) Pt nanoparticles (≈42 mA cm−2) as compared to the polyoriented Pt nanoparticles (≈32 mA cm−2) in agreement with previous single crystal studies. Nevertheless, this tendency was not observed in chronoamperometry at 0.4 V where currents obtained at maximum Bi coverage were similar. On the other hand, CO poison formation was also evaluated at open circuit potential. The resulting electrochemical activity has been rationalized using different parameters, such as surface structure, size domains, particle size and Bi coverage.

Graphical abstract: Formic acid electrooxidation on Bi-modified polyoriented and preferential (111) Pt nanoparticles

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Publication details

The article was received on 13 Aug 2008, accepted on 29 Sep 2008 and first published on 28 Oct 2008


Article type: Paper
DOI: 10.1039/B814072C
Citation: Phys. Chem. Chem. Phys., 2009,11, 416-424
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    Formic acid electrooxidation on Bi-modified polyoriented and preferential (111) Pt nanoparticles

    A. López-Cudero, F. J. Vidal-Iglesias, J. Solla-Gullón, E. Herrero, A. Aldaz and J. M. Feliu, Phys. Chem. Chem. Phys., 2009, 11, 416
    DOI: 10.1039/B814072C

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