1. Fig. 1 Evaluation of electrocatalytic activities toward ORR and OER
Fig. 1 Evaluation of electrocatalytic activities toward ORR and OER. (A) LSV curves of electrocatalysts in oxygen-saturated electrolyte with different rotating rates.
Evaluation of electrocatalytic activities toward ORR and OER. (A) LSV curves of electrocatalysts in oxygen-saturated electrolyte with different rotating rates. (B) Oxygen reduction curves on the disc and ring electrodes of RRDE at 5 mV s−1 scan rate at 1600 rpm, respectively. (C) Exemplary OER currents of La1−xCaxCoO3 and LaCoO3 thin films on a glassy carbon electrode (GCE) in O2-saturated 0.1 M KOH at 10 mV s−1 scan rate at 1600 rpm, capacitance-corrected by taking an average of the positive and negative scans. The contributions from AB (acetylene black) and binder (Nafion) in the thin film and GCE are shown for comparison. (D) Evidence of O2 generated from Ba0.5Sr0.5Co0.8Fe0.2O3−d (BSCF) using RRDE measurements (schematic shown as an inset). The O2 gas generated from BSCF on a GCE disc (OER current given as idisc) is reduced at the Pt ring at a constant potential of 0.4 V versus reversible hydrogen electrode (RHE). The collecting efficiency of RRED is 0.2. [From J. Suntivich, K. J. May, H. A. Gasteiger, J. B. Goodenough, Y. Shao-Horn, A perovskite oxide optimized for oxygen evolution catalysis from molecular orbital principles. Science334, 1383–1385 (2011). Reprinted with permission from AAAS.]
Jintao Zhang et al. Sci Adv 2015;1:e
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