Fig. 3: Two-electron ORR activity and selectivity evaluation of the TMPc-OCNT catalysts using RRDE.

Linear sweep voltammetry show that ORR and simultaneous H₂O₂ oxidization currents are achieved on disk and ring electrodes, respectively. a-b Tests in 0.01 M KOH (pH 11.9) c-d 0.1 M KOH (pH 12.7) and e-f 0.1 M K₂SO₄ (pH 7.2).