Electrocatalyst for Oxygen Reduction with Reduced Platinum Oxidation and Dissolution Rates
Results of a density functional theory calculation of atomic positions of platinum on an oxide surface, showing good agreement with experimental results.
Platinum is the most efficient electrocatalyst for accelerating the oxygen reduction reaction in fuel cells. Under operating conditions, though, platinum catalysts can dissolve. When used in place of pure platinum, platinum-metal oxide composites can spare the precious metal when used as fuel cell catalysts.Description
Metal oxides are not typically conductive enough to be good substrates for electrochemical deposition of metals. In the inventive method, non-noble metal cations are first adsorbed onto the surface of a metal oxide core. The cation adsorbate is then reduced to provide an appropriate surface for the subsequent deposition of noble metal from a solution of metal salts.Benefits
Electrocatalysts made from layers of noble metals, such as platinum, on metal oxide cores stabilize the noble metal against dissolution, resulting in a longer catalytic lifetime compared to bulk platinum/carbon catalysts.Applications and Industries
Fuel cell catalysts; oxygen reduction; heterogeneous catalysis.More Information
Vukmirovic, et al., “Electrodeposition of Pt onto RuO2 (110) Single-crystal Surface,” J. Phys. Chem. C. 111, 15306 (2007)Patents and Patent Applications
|Title and Abstract||
Electrocatalyst for oxygen reduction with reduced platinum oxidation and dissolution rates
The invention relates to platinum-metal oxide composite particles and their use as electrocatalysts in oxygen-reducing cathodes and fuel cells. The invention particularly relates to methods for preventing the oxidation of the platinum electrocatalyst in the cathodes of fuel cells by use of these platinum-metal oxide composite particles. The invention additionally relates to methods for producing electrical energy by supplying such a fuel cell with an oxidant, such as oxygen, and a fuel source, such as hydrogen.
|Brookhaven National Laboratory||11/22/2011
|Technology ID||Development Stage||Availability||Published||Last Updated|