TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The fine metal particles comprise fine metal chain particles resulting from chainwise linkage of at least two primary particles having an average primary particle diameter of 2-50 nm. The fine metal particles comprise gold, silver, palladium, platinum, rhodium, copper, iron, nickel, cobalt, tin, titanium, indium, aluminum, tantalum, antimony, ruthenium, molybdenum, and/or chromium. The carrier particles comprise carbon.Preferred Process: The electrode catalyst fine particles are dispersed in water at 1 wt.% solid concentration and a pH of 1-10 to provide a flow potential of -800 to -50 mV.Preferred Properties: The fine metal particles have an average particle diameter of 2-100 nm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The fine metal particles comprise fine metal chain particles resulting from chainwise linkage of at least two primary particles having an average primary particle diameter of 2-50 nm. The fine metal particles comprise gold, silver, palladium, platinum, rhodium, copper, iron, nickel, cobalt, tin, titanium, indium, aluminum, tantalum, antimony, ruthenium, molybdenum, and/or chromium. The carrier particles comprise carbon.Preferred Process: The electrode catalyst fine particles are dispersed in water at 1 wt.% solid concentration and a pH of 1-10 to provide a flow potential of -800 to -50 mV.Preferred Properties: The fine metal particles have an average particle diameter of 2-100 nm. EXAMPLE - Chloroplatinic hexahydrate (25 g) was dissolved in pure water (16000 g). The aqueous solution was combined with trisodium citrate aqueous solution (1 wt.%, 1660 g) and sodium borohydride aqueous solution (0.1 wt.%, 140 g). The mixture was stirred at 20degreesC for 1 hour in nitrogen atmosphere. The resultant dispersion of fine metal particles was purified, and the filtrate was concentrated to give a dispersion of fine platinum particles at 1 wt.% concentration. The dispersion had a pH of 6, an average particle diameter of 4 nm, and a flow potential of -130 mV. Separately, carbon black powder (5 g) was added to pure water (495 g) and mixed. The resultant mixture was adjusted to pH 8 by addition of 1 wt.% concentration hydrochloric acid. The carbon black dispersion had a flow potential of 900 mV. The carbon black dispersion was combined with fine platinum particle dispersion (1000 g), and the pH of the dispersion mixture was adjusted to 6. In a nitrogen atmosphere, the dispersion mixture was stirred for 1 hour at 20degreesC, thus, the fine platinum particles were supported on the carbon black particles.