TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The iridium precursor is iridium chloride, iridium sodium chloride, hexachloroiridate and/or sodium hexachloroiridate, and the nickel precursor is nickel chloride, nickel sulfate and/or nickel nitrate. Preferred Process: The metal precursor supported by functional Vulcan XC-72 (RTM: modified carbon powder) toner, hexachloroiridate, nickel chloride, sodium citrate are weighed in mass ratio 1:0.45:0.13:1.17. The functionalized Vulcan XC-72 (RTM: modified carbon powder) carbon powder is added to deionized water, ultrasonic dispersion is carried out for 30 minutes to form a uniformly dispersed 8 mg/ml Vulcan XC-72 (RTM: modified carbon powder) toner suspension. An ultrasonic dispersion is carried out for dispersion for 20 minutes, stirred for 12 hours, and 28 %mass aqueous ammonia is added to adjust pH to 12, stirred for 18 hours and dried at 60 degrees C water bath and ground to powder, to obtain carbon-containing iridium-nickel complex. The carbon-containing iridium-nickel complex is added with hydrogen and argon gas in volume ratio of 1:6 at gas flow rate of 350 ml/min at 500 degrees C in a mixed atmosphere, heated for 2 hours, cooled, washed with water, and dried in vacuum, to obtain a carbon-nickel alloy-containing iridium catalyst. Alternately, the carbon-nickel alloy-containing iridium catalyst is prepared by weighing and mixing the metal precursor supported by functional Vulcan XC-72 (RTM: modified carbon powder) toner, sodium hexachloroiridate, nickel nitrate, sodium citrate in mass ratio 1:0.51:0.11:1, adding the functionalized Vulcan XC-72 (RTM: modified carbon powder) carbon powder, sodium chloride iridium, nickel nitrate and sodium citrate to deionized water, carrying out ultrasonic dispersion for 30 minutes to form a uniformly dispersed 15 mg/ml Vulcan XC-72 (RTM: modified carbon powder) toner suspension, carrying out ultrasonic dispersion for 20 minutes, stirring for 15 hours, and adding 28 %mass aqueous ammonia to adjust pH to 11.5, stirring for 15 hours, drying at 60 degrees C water bath and grinding to obtain carbon-containing iridium nickel complex, adding carbon-containing nickel complex of iridium with hydrogen and argon gas in volume ratio of 1:4 at gas flow rate of 500 ml/min at 500 degrees C in a mixed atmosphere, heating for 2 hours, cooling, washing with water, and drying in vacuum, or the carbon-nickel alloy-containing iridium catalyst is prepared by weighing and mixing the metal precursor supported by functional Vulcan XC-72 (RTM: modified carbon powder) toner, sub-iridium acid sodium, nickel sulfate, sodium citrate are weighed in mass ratio 1:0.1:0.05:0.2, adding the functionalized Vulcan XC-72 (RTM: modified carbon powder) carbon powder, sodium chloride iridium, nickel nitrate and sodium citrate to deionized water, carrying out ultrasonic dispersion for 60 minutes to form a uniformly dispersed 25 mg/ml Vulcan XC-72 (RTM: modified carbon powder) toner suspension, carrying out ultrasonic dispersion for 10 minutes, stirring for 6 hours, and adding 28 %mass aqueous ammonia to adjust pH to 11, stirring for 6 hours, drying at 50 degrees C water bath and grinding to obtain carbon-containing iridium nickel complex, adding carbon-containing nickel complex of iridium with hydrogen and argon gas in volume ratio of 1:1 at gas flow rate of 100 ml/min at 700 degrees C in a mixed atmosphere, heating for 1 hour, cooling, washing with water, and drying in vacuum, or the carbon-nickel alloy-containing iridium catalyst is prepared by weighing and mixing the metal precursor supported by functional Vulcan XC-72 (RTM: modified carbon powder) toner hexachloroiridate, nickel chloride, sodium citrate are weighed in mass ratio 1:2:1:2, adding the functionalized Vulcan XC-72 (RTM: modified carbon powder) carbon powder, iridium chloride, nickel chloride, acid chloride and sodium citrate to deionized water, carrying out ultrasonic dispersion for 10 minutes to form a uniformly dispersed 3 g/ml Vulcan XC-72 (RTM: modified carbon powder) toner suspension, carrying out ultrasonic dispersion for 60 minutes, stirring for 24 hours, and adding 28 %mass aqueous ammonia to adjust pH to 13, stirring for 24 hours, drying at 80 degrees C water bath and grinding to obtain carbon-containing iridium nickel complex, adding carbon-containing nickel complex of iridium with hydrogen and argon gas in volume ratio of 1:8 at gas flow rate of 800 ml/min at 300 degrees C in a mixed atmosphere, heating for 3 hours, cooling, washing with water, and drying in vacuum.