COMPOSITE COMPRISING PLATINUM-ALKALINE EARTH METAL ALLOY, FUEL CELL AND WATER ELECTROLYZER COMPRISING THE SAME AND MANUFACTURING METHOD THEREOF

The present invention relates to a composite that is-cost-effective, has an excellent catalytic activity, and significantly improves stability compared to a pure platinum catalyst according to the related art. Specifically, the composite according to the present invention contains a carbon support and a binary alloy consisting of platinum and an alkaline earth metal supported on the carbon support which satisfies a specific condition in a Pt 4f X-ray photoelectron spectroscopy (XPS) spectrum of the binary alloy.