TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The metal precursors are platinum salts, and/or salts of the desired ad-metals/ad-metal oxides. They are preferably platinum salts or salts of the desired ad-metals. The catalyst nano-particles contain a platinum-ruthenium (PtRu) alloy phase of 85:15 Pt:Ru atomic percentage ratio; a Pt phase; and a ruthenium (Ru) phase. The Pt:Ru atomic percentage ratio is 50:50-80:20, preferably 50:50, 70:30 or 80:20. Preferred Property: The catalyst particles are in the nano-size range of 1-5 nm. The particle size is 2.5+/-0.5, 1.5+/-0.5 or 1.2+/-0.5 nm.Preferred Process: The catalyst nano-particles are deposited on or directly synthesized onto or into an internal porous structure of a support material, resulting in supported catalysts. The process further includes simultaneously forming and depositing the catalyst nano-particles onto/into the support by adding the support to the synthesis colloidal solution (that comprises the metal precursors and ethylene glycol), or by immersing (impregnating) the support in the synthesis colloidal solution before the reduction/deposition process takes place to the reacting step; and synthesizing the platinum based nano-size catalyst particles in ethylene glycol, and subsequently applying the particles on/into the support by immersing the support in the stirred colloidal solution or by spraying the nano-sized catalyst particles on/into the support. The initial solution pH is controlled in 12-8 by addition of a strong base, preferably varying amounts of sodium hydroxide. The reaction is effected at a temperature higher than 140degreesC for a few minutes up to 3 hours, or by slowly raising the temperature over a period of several hours.    TECHNOLOGY FOCUS - ELECTRONICS - Preferred Component: The support is an electronic conductor of high surface area in the form of a metal, metal oxide, carbon based materials, gas diffusion electrodes or electronically conductive ceramics.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The supported catalysts are subsequently formed into electrodes to be used as anode or cathode in fuel cell's for hydrogen (H2), carbon monoxide (CO), methyl hydroxide (CH3OH) oxidation reaction and oxygen (O2) reduction reactions, respectively. Preferred Definition:    X = Ru.    EXAMPLE - No example given.