Metal and Metal Oxide-Supported Platinum Monolayer Electrocatalysts for Oxygen Reduction
Research is directed towards the synthesis and characterization of Pt
monolayer electrocatalysts supported by metal, metal alloy, non-noble metal
- noble metal core - shell and oxide nanoparticles, or single crystal
extended surfaces. This new approach has the potential to yield
electrocatalysts with the lowest Pt content and improved catalytic activity,
which can reduce the cost of fuel cells. In a parallel effort we are
developing new improved Pd alloy electrocatalysts that can replace Pt in
fuel cell cathodes. The structural, electronic and catalytic properties of
electrocatalysts for O2 reduction, methanol, ethanol and CO
oxidation reactions are studied by in situ and ex situ
synchrotron radiation, surface science, infrared and electrochemical
techniques. The synthesis of Pt monolayer electrocatalysts is based on the
unique method that involves a Pt monolayer deposition by displacement of an
adsorbed Cu monolayer. Understanding the phenomena which determine the
catalytic properties, structure-activity correlations, catalysts’ stability,
segregation, structure and ordering of atomic and molecular monolayers at
electrochemical interfaces is sought by combining the above techniques and
kinetic analyses of the O2 reduction reaction with intensive
density functional theory calculations.
2. Pt submonolayer on Ru (PtRu20) Electrocatalysts: H2, CO and reformate H2 oxidation; Pt content is 1/10 of that in commercial catalysts, high CO tolerance; Oxidation of Methanol and Ethanol; Adsorbate-Surface Interactions.
Surface Electrochemistry: To obtain a true microscopic description of electrochemical interfaces, structural and electronic properties of atomic and molecular monolayers on single-crystal and nanoparticle substrates are investigated using in situ scanning tunneling microscopy, surface x-ray scattering and x-ray absorption spectroscopy.
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Reaction on Pt
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Shao, K. Sasaki, M.B. Vukmirovic, J. Zhang, N. S. Marinkovic, P. Liu, A.I.
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Zhou, and R. R. Adzic, Oxygen
reduction on well-defined core-shell nanoparticles:Size, facet, and Pt shell
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8. Kuanping Gong, Dong Su, Radoslav R. Adzic Platinum-Monolayer Shell on AuNi0.5Fe Nanoparticle Core Electrocatalyst with High Activity and Stability for the Oxygen Reduction Reaction, J. Am. Chem. Soc. Web.
9. K. Sasaki, Y. Cai, Dr. Y. Choi, P. Liu, Dr. M. B. Vukmirovic, Dr. J. X. Wang, and Dr. R. R. Adzic, Core-protected Core-shell Electrocatalysts: Potential for Automotive Applications of Fuel Cells, Angewandte Chemie Intern. web.
10. Platinum Monolayer Electrocatalysts for Fuel Cells, R. R. Adzic, F. Lima, in Handbook of Fuel Cells, Vol. 5 –Advances in Electrocatalysis, Materials, Diagnostics and Durability, Eds. W. Vielstich, H. A. Gasteiger, H. Yokokawa pp 5-18, J. Wiley & Sons, New York, 2009.
Supported by the the Division of Chemical Sciences, Geosciences, and Biosciences of the Office of Basic Energy Sciences of the Office of Science under contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Last Modified: June 28, 2012