Science Advances

Supplementary Materials

This PDF file includes:

  • Fig. S1. SEM images and particle size distribution of CaCoO3 and SrCoO3.
  • Fig. S2. Elemental distribution of CaCoO3 and SrCoO3.
  • Fig. S3. CV curves of Co-based catalysts.
  • Fig. S4. Double-layer capacitance measurement to determine the electrochemically active surface area of CaCoO3 and RuO2.
  • Fig. S5. The impedance plots and cycling stability of the catalysts studied in this work.
  • Fig. S6. Response of charge transfer resistance (Rct) to applied potential of the catalysts studied in this work to applied potential in the solution of pH 12.5, 13, 13.5, and 14.
  • Fig. S7. The intermediate spin state of CoIII in LaCoO3 (t4e1, S = 1) at 25°C.
  • Fig. S8. pH-dependent OER activity of RuO2 in O2-saturated KOH with pH 12.5 to 14.
  • Table S1. Structural refinements of CaCoO3 and SrCoO3 obtained at room temperature.
  • Table S2. OER activity and ECSA of all studied catalysts.

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