Electrodeposition of Pt onto RuO 2(110) single-crystal surface

Miomir B. Vukmirovic; Ping Liu; James T. Muckerman; Radoslav R. Adzic

doi:10.1021/jp0742719

Electrodeposition of Pt onto RuO ₂(110) single-crystal surface

Miomir B. Vukmirovic, Ping Liu, James T. Muckerman, Radoslav R. Adzic

Brookhaven National Laboratory

Research output: Contribution to journal › Article

11 Citations (Scopus)

Abstract

The electrodeposition of Pt on RuO ₂(110) from acid solutions of several Pt complexes was studied using programmed potential step or potential sweep methods. The RuO ₂(110) single-crystal surface was obtained by gas-phase oxidation of Ru(0001). The electrodeposition process is characterized by a large crystallization overpotential and three-dimensional growth from a Pt adlayer. The mismatch between the RuO ₂(110) and Pt lattices is the likely origin of that overpotential. The nucleation is instantaneous, as verified by potential step experiments. The process starts with depositing a 0.25 ML of Pt, with Pt atoms arranged in a c(2 × 2) array, which is followed by the growth of Pt islands and three-dimensional clusters as in the Stranski-Krastanov growth mode. Density functional theory calculations were used to help in elucidating atomically resolved electrochemical scanning tunneling microscopy (ECSTM) images of the initial stages of Pt deposition. A Pt adlayer on RuO ₂(110) has lower catalytic activity for the oxygen reduction reaction compared to Pt, which is in agreement with a large calculated upshift of the d-band center of a low-coverage Pt deposit on RuO ₂-(110) as well as a lack of the oxygen adsorption in a bridge configuration on that surface.

Original language	English
Pages (from-to)	15306-15311
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	42
DOIs	https://doi.org/10.1021/jp0742719
Publication status	Published - Oct 25 2007

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ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

Cite this

Vukmirovic, M. B., Liu, P., Muckerman, J. T., & Adzic, R. R. (2007). Electrodeposition of Pt onto RuO ₂(110) single-crystal surface. Journal of Physical Chemistry C, 111(42), 15306-15311. https://doi.org/10.1021/jp0742719

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10.1021/jp0742719