Abstract
The present paper presents a study of the Ru x Cr y Se z chalcogenide electrocatalyst based on physical–chemical characterization through scanning electron (SEM), atomic force (AFM) microscopy and energy dispersion elemental analysis (EDS), thermal stability using differential scanning calorimeter (DSC), electrochemical kinetics towards the oxygen reduction reaction (ORR) in acid media by rotating ring-disk electrode (RRDE) and single and three-stack membrane-electrode assembly (MEA) performance as a function of catalyst loading (10%, 20% and 40% W from 0.2 to 2 mg cm −2). Results indicate an electrocatalyst with chemical composition of Ru 6Cr 4Se 5. AFM images showed 80–160 nm nanoparticle agglomerates. Good thermal stability of the cathode Ru 6Cr 4Se 5 was established after 100 h of continuous operation. The electrochemical kinetics study (RRDE) resulted in a electrocatalyst with high activity towards the ORR, preferentially proceeding via 4e − charge transfer pathway towards water formation ( i.e., O 2+4H ++4e −→2H 2O), with a maximum of 2.8% H 2O 2 formation at 25 °C. Finally, MEA tests revealed a maximum power density of 220 mW cm −2 with a catalyst loading of 20 wt% at 1.6 mg cm −2.
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