Platinum nanoparticles supported on FeCr alloy have been synthesized at a large-scale by sequential electrical explosion of FeCr alloy and Pt wires in ethanol. X-ray diffraction showed corresponding peaks of non-oxide phase Pt and FeCr alloy nanoparticles. Transmission electron microscopy showed uniform dispersion of Pt nanoparticles on the support with an average size of 2 nm and high thermal stability up to 600 A degrees C. These Pt-FeCr alloy nanoparticles were found to be active for CO oxidation with an activation energy of 15 kcal mol(-1) and negligible deactivation. This work demonstrated the application of the electrical wire explosion process for synthesis of supported metal catalysts with high thermal stability and activity.