Figure 8.

(a) CVs of PDI-1 under 1 atm O₂ or Ar. All scans were collected at 100 mV s^–1 using a GC working electrode with an area of 0.196 cm². (b) LSV curves of RDEVs of PDI-1 in O₂-saturated 0.1 M NaHPO₄/NaH₂PO₄ buffer solution at pH 7 with different rotating speeds ranging from 400 to 1600 rpm. Inset: Koutecky–Levich plots of PDI-1 showing that n = 1.9. (c) RRDEV of PDI-1 in 0.1 M NaHPO₄/NaH₂PO₄ buffer solution at pH 7 with a rotation speed 1600 rpm. The disk was scanned from 0.8 to −0.2 V while the ring electrode was held at 1.4 V. (d) The number of electrons transferred and the H₂O₂ yield of PDI-1during ORR as calculated by ring currents.