Formic Acid Oxidation on Bi-modified Pt Nanoparticles of Various Sizes
- Formic Acid Oxidation on Bi-modified Pt Nanoparticles of Various Sizes
- 정창훈; Ting Zhang; 김병준; 김잔디; 이충균; 임태훈
- Bismuth; platinum nanoparticle; size effect; formic acid oxidation; catalytic poison
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 31, NO 6, 1543-1550
- This work presents oxidation of formic acid on Bi-modified Pt nanoparticles of various sizes. The sizes of the studied
Pt nanoparticles range from 1.5 to 5.6 nm (detailed in Rhee, C. K.; Kim, B.-J.; Ham, C.; Kim, Y.-J.; Song, K.; Kwon, K.
Langmuir 2009, 25, 7140-7147), and the surfaces of the Pt nanoparticles are modified with irreversibly adsorbed Bi.
The investigated coverages of Bi on the Pt nanoparticles are 0.12 and 0.25 as determined by coulometry of the oxidation
of adsorbed hydrogen and Bi, and X-ray photoelectron spectroscopy. The cyclic voltammetric behavior of formic acid
oxidation reveals that the adsorbed Bi enhances the catalytic activity of Pt nanoparticles by impeding a poison-forming
dehydration path with a concomitant promotion of a dehydrogenation path. The chronoamperometric results indicate
that elemental Bi and partially oxidized Bi are responsible for the catalytic enhancement, when the Bi coverages on Pt
nanoparticles are 0.12 and 0.25, respectively. The size effect of Bi-modified Pt nanoparticles in formic acid oxidation
is discussed in terms of specific activity (current per unit surface area) and mass activity (current per unit mass).
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