NOVELTY - A decomposable polymer template particles having particle surfaces are suspended in acidified alcohol medium, and a titanium precursor alkoxide is added into the medium. The precursor alkoxide is hydrolyzed to deposit hydrated titanium oxide on particles surface, and the particles with hydrated titanium oxide are collected. The particles are heated to decompose the polymer particles and dehydrate the hydrated titanium oxide into anhydrous titanium oxide in which titanium oxide(s) is converted into its rutile crystal phase, to synthesize mesoporous catalyst support material.    USE - Method for synthesizing mesoporous catalyst support material used for proton-exchange membrane fuel cell electrode. Can also be used for fuel cell electrocatalyst.    ADVANTAGE - The mesoporous catalyst support material has excellent electrical conductivity, favorable surface characteristics, and low electrical resistivity.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) method for synthesizing mesoporous and electrically conductive catalyst support material comprising titanium oxide doped with niobium used in proton-exchange membrane (PEM) fuel cell electrode, involves providing decomposable nanometer scale polymer template particles having particle surfaces and suspended in acidified alcohol medium, adding titanium precursor alkoxide and niobium precursor alkoxide to the medium, hydrolyzing the alkoxides to deposit hydrated titanium oxide doped with between 5-10 mol% of niobium oxide on surfaces of polymer template particles, collecting the polymer template particles with hydrated titanium oxide and niobium oxide deposited, heating the polymer template particles to decompose the polymer particle and dehydrate the hydrated titanium and niobium oxide into anhydrous titanium oxide doped with niobium oxide in which at least some of titanium oxide is converted into its rutile crystal phase and some of titanium oxide is converted into its anatase phase, and heating titanium oxide and niobium oxide for further converting at least some of titanium oxide from its anatase phase to its rutile phase and to produce lower oxidation state titanium oxides; and    (2) mesoporous catalyst support material, which comprises rutile titanium oxide doped with transition metal oxide. The catalyst support material transition metal-containing titanium oxide compound (Ti1-xMxOy, where M is transition metal element having oxidation state, x is 0.05-0.1, and y is variable depending on oxidation state of transition metal element).    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of proton-exchange membrane fuel cell electrode.    Proton-exchange membrane fuel cell (10)    Membrane electrode assembly (12)    Gas diffusion media layer (14)    Bipolar plate (16)    Solid electrolyte membrane (18)    Anode (20)    Cathode (22)