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Spontaneous Bi-modification of polycrystalline Pt electrode: fabrication, characterization, and performance in formic acid electrooxidation

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Abstract

Spontaneous modification of polycrystalline Pt by irreversibly adsorbed bismuth was performed in BiCl3 solution in concentrated hydrochloric acid under open-circuit conditions. After spontaneous modification, followed by extensive rinsing with water and drying, the surface was characterized using X-ray photoelectron spectroscopy and electrochemistry. Bi-oxy(chloride), oxide species, and metallic Bi were found at a submonolayer coverage on the Pt surface after spontaneous modification. The electrochemical response of Bi-modified polycrystalline Pt electrode in sulfuric acid solution exhibits a complex multi-peak feature, which is resulting in about constant redox charge (Bi species coverage) in the potential region from 0 to 0.9 V (vs. a standard hydrogen electrode). The spontaneously Bi-modified Pt catalyst in model studies exhibits a superior activity towards formic acid oxidation at fuel cell anode relevant potentials. The catalytic effect of bismuth oxy-species is explained in terms of both inhibition of COad formation and oxidation of COad in reaction with Bi-oxy-species.

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Author notes

  1. Zenonas Jusys

    Present address: Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, D-89069, Ulm, Germany

Authors and Affiliations

  1. Institute of Chemistry, A. Goštauto 9, LT-01108, Vilnius, Lithuania

    Vilija Pautienienė, Loreta Tamašauskaitė-Tamašiūnaitė, Aloyzas Sudavičius & Giedrius Stalnionis

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  1. Vilija Pautienienė
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  2. Loreta Tamašauskaitė-Tamašiūnaitė
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  3. Aloyzas Sudavičius
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  4. Giedrius Stalnionis
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  5. Zenonas Jusys
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Correspondence to Zenonas Jusys.

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Pautienienė, V., Tamašauskaitė-Tamašiūnaitė, L., Sudavičius, A. et al. Spontaneous Bi-modification of polycrystalline Pt electrode: fabrication, characterization, and performance in formic acid electrooxidation. J Solid State Electrochem 14, 1675–1680 (2010). https://doi.org/10.1007/s10008-009-0996-x

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  • DOI: https://doi.org/10.1007/s10008-009-0996-x

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