Fig. 2: Electrochemical performance of the electrocatalyst towards the OER.
From: The role of carbon catalyst coatings in the electrochemical water splitting reaction
a Rotating disk linear-sweep voltammograms (RDE-LSVs) of 0.5 mg cm−2 Co3O4@SWNT, RuO2@SWNT, IrO2@SWNT and empty SWNTs recorded between 1.0 V and 1.8 V vs RHE at 1600 rpm and 5 mV s−1 in O2-saturated 0.1 M KOH. The test materials were immobilised on a glassy carbon (GC) disc electrode, and a graphite rod was used as the counter electrode. Currents are normalised to the geometric area of the disc. A Hg/HgO reference electrode was used in the cell, and all potentials were converted to the reversible hydrogen electrode (RHE) scale. b Plot of log current density vs overpotential for the OER, extracted from the LSVs shown in a. Tafel slopes were fitted from the most linear parts of the curves, as determined by R2 value, with all Tafel slope values presented having R2 values > 0.9995. c–f RDE-LSVs of MOx@SWNT, MOx/AC and empty SWNTs in N2-saturated 0.1 M KOH. The materials were cycled between 0.9 and 1.7 V vs RHE at a scan rate of 100 mV s–1, and voltammograms were recorded before and after, using a scan rate of 5 mV s–1.
