Rotating ring-disk electrode as a quantitative tool for the investigation of the oxygen evolution reaction

In this work we analyze the applicability limits of the rotating ring-disk electrode (RRDE) technique for quantifying the amount of oxygen produced during the oxygen evolution reaction (OER). We utilize a state-of-the art IrO₂ oxide as a carbon-free OER catalyst and La_1−xSr_xMn_0.5Co_0.5O_3−δ, x = 0.25 and 0.5 perovskites, which are studied in the presence of carbon. RRDE experiments are performed at different IrO₂ loadings under both potentiodynamic and potentiostatic modes. The experimental data allow us to formulate the requirements to the experimental conditions necessary to avoid underestimation of the oxygen yield.