Fig. 4: Two electron ORR activity measurements and rationalization.
From: Grain boundary engineering for efficient and durable electrocatalysis
a Linear sweep voltammetry of Au NPs, L-Au NAs, M-Au NAs and H-Au NAs recorded at 1600 rpm and a scan rate of 5 mV s−1 in 0.1 M HClO4, together with the detected H2O2 currents on the ring electrode (upper panel) at a fixed potential of 1.2 V vs. RHE. b Calculated H2O2 selectivity during potential sweep. c Comparison of the onset potential and H2O2 selectivity of Au catalysts developed in this study and the state-of-the-art H2O2 catalysts in 0.1 M HClO4 from the literature (Table S4). d Correlation between GB density and the two-electron ORR activity, including onset potential, H2O2 selectivity, specific activity, and mass activity. Error bars indicate the standard deviation based on at least three independent measurements. e The calculated ORR activity volcano relationship between the limiting potential (UL) and the free energy of *OOH (ΔG*OOH) for the two-electron pathway to H2O2. f Calculated reaction coordinate diagrams for the Au and lattice-expanded Au. Source data are provided as a Source Data file.
