TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal is copper, cobalt, or nickel. The water-soluble salt of metal is sulfate, chloride salt and nitrate of the metal. The platinum salt aqueous solution is one of platinochloric acid aqueous solution, dinitrotetraamine platinum aqueous solution and dinitrodiamine platinum aqueous solution. The M/PCE electrode is preferably copper/PCE electrode. When dinitrotetraammine platinum aqueous solution is used as platinum salt aqueous solution, the pH value and concentration of dinitrotetraammine platinum aqueous solution are controlled at 7 and 5 g/L and displacement is carried out for 1.5 hours. When platinochloric acid aqueous solution is used as platinum salt aqueous solution, the pH value and concentration of the platinochloric acid aqueous solution are controlled at 3 and 2 g/L, and the displacement is carried out for 3 hours. The two-electrode system comprises porous carbon electrode spliced by perfluorosulfonic resin as a cathode, metal copper as an anode, and electrolyte. The electrolyte comprises copper sulfate solution (62.5 g/L) and sulfuric acid solution (196 g/L). Preferred Methods: The third step comprises preparing a high dispersion size controllable copper/PCE electrode using four-step electrodeposition at 25 degrees C. The four-step electrodeposition comprises first step carried out at peak current density of 0.5 A/dm2 for 100 seconds, second step carried out at peak current density of 10A/dm2 for 3 seconds, third step carried out at peak current density of 0.5 A/dm2 for 60 second, and fourth step carried out at peak current density of 5 A/dm2 for 5 seconds. The four-step electrodeposition comprises using a two-electrode system. The fourth step involves cleaning copper/PCE electrode with ultra-pure water, soaking the electrode in platinum salt aqueous solution in the presence of nitrogen to carry out displacement for 2 hours, controlling pH value and concentration of platinum salt aqueous solution to 6 and 0.5 g/L, respectively, and obtaining carbon-carried ultra-low platinum catalyze electrode.