Electrochemical performance of crystalline Ni–Co–Mo–Fe electrodes obtained by mechanical alloying on the oxygen evolution reaction

摘要: Abstract Electro-active Co 30 Ni 70 , Mo 10 20 Fe 60 and wt% alloys have been prepared by mechanical alloying. The electrocatalytic behavior of obtained electrodes has evaluated in 30 wt% KOH aqueous solutions as a function different temperatures (298, 323 343 K) overvoltages ( η = 200 300, 400 mV). effect contamination during milling was also analyzed. electrode performance studied cyclic voltammetry, ac–impedance steady-state polarization techniques. Appreciable current values for oxygen evolution reactions (OER) were measured at Ni–Co–Mo–Fe produced this technique. It found that the electrochemically formed oxides and/or hydroxides did not show an activity OER good reported on hydrogen reaction (HER). Tafel plots preoxidized 1 cycle prolonged cycled (50 cycles) crystalline very different, which might be related to changes surface enrichment one or two alloy constituents. effects seem more important higher than those showed previously HER. Molybdenum containing powders ) best catalytic OER.