CATALYSTS DEVELOPMENT FOR ANION-EXCHANGE-MEMBRANE ELECTROLYSERS

NiFe2O4 catalyst was synthesized by a liquid-phase method producing a spinel structure with a crystallite size of about 3.3 nm. The formation mechanism and the size of the crystals are due to both reagents' molar ratio and the dilution ratios. The calcination temperature of 350°C was chosen in order to obtain nano-sized particles. The MEA based on the synthesized NiFe2O4 catalyst at the anode reached a current density of 3 A/cm2 at 60°C and 2.2 V, higher than NiO and IrO2 commercial catalysts. Moreover, a chronoamperometric test of 120 h highlighted a good stability of the synthesized catalyst.