Fig. 4: OER catalytic performance of Co4O4-0, Co4O4-ppa3, Co4O4-ppa3-Ppy, Ppy-ppa, CoOOH, and Co3O4, and the proposed role of Ppy during catalysis.
From: {Co4O4} Cubanes in a conducting polymer matrix as bio-inspired molecular oxygen evolution catalysts
a Linear sweep voltammograms of OER for Co4O4-0, Co4O4-ppa3, Co4O4-ppa3-Ppy, Ppy-ppa, CoOOH, and Co3O4 at a scan rate of 10 mV/s in 1 M KOH. b Tafel plots of Co4O4-0, Co4O4-ppa3, Co4O4-ppa3-Ppy, Ppy-ppa, CoOOH, and Co3O4. c The double-layer capacitance (Cdl) of Co4O4-0, Co4O4-ppa3, Co4O4-ppa3-Ppy, Ppy-ppa, CoOOH, and Co3O4, determined from CV in a non-Faradaic region (0.86–0.98 V vs. RHE) at scan rates of 10, 20, 30, 40, and 50 mV s-1. d Nyquist plots of the OER for Co4O4-0, Co4O4-ppa3, Co4O4-ppa3-Ppy, CoOOH, and Co3O4 under an applied potential of 1.7 V vs. RHE. e OER stability test of Co4O4-0, Co4O4-ppa3, Co4O4-ppa3-Ppy, CoOOH, and Co3O4 at 20 mA cm-2. f Co K-edge EXAFS spectra of Co4O4-0, Co4O4-ppa1, Co4O4-ppa3, Co4O4-ppa3-Ppy, and post-Co4O4-ppa3-Ppy (phase uncorrected). g Proposed function of p-type Ppy during OER.
