Iridium−Rhodium Nanoparticles for Ammonia Oxidation: Electrochemical and Fuel Cell Studies

Abstract This study reports the use of carbon‐supported IrRh/C electrocatalysts with different iridium‐to‐rhodium atomic ratios (0 : 100, 50 : 50, 70 : 30, 90 : 10, and 100 : 0) for ammonia electro‐oxidation (AmER) in alkaline media. The materials prepared by using the sodium borohydride method showed a mean diameter of 4.5, 4.8, 4.2, and 4.5 nm for Ir/C, Ir 90 Rh 10 /C, Ir 70 Rh 30 /C, and Ir 50 Rh 50 /C, respectively. According to electrochemical and fuel cell experiments, the Ir 50 Rh 50 /C catalyst was the most promising towards AmER. This catalyst, which consisted predominantly of the metallic Ir/Rh phases, showed a 500 % higher current density and 55 % higher maximum power than that obtained for Ir/C. After 8 h galvanostatic electrolysis, 93 % of initial ammonia was degraded when using Ir 50 Rh 50 /C, whereas it was only 70 % with Ir/C. The high activity of the Ir 50 Rh 50 /C is attributed to a synergic effect of two metals at this iridium‐to‐rhodium ratio, which enhances the kinetics of AmER contributing towards ammonia dehydrogenation at lower potentials.