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LSVs of Pb2Ru2O7-δ pyrochlore, RuO2, and GC in 2.8 M magnesium perchlorate at (A) 21 °C and (B) −36 °C. (C) OER current density at 200-mV overpotential vs. OER onset potential for Pb2Ru2O7-δ pyrochlore, RuO2, and GC under an O2-purged environment over a range of temperatures (21 °C [leftmost point] to −36 °C [rightmost point]). E0 (Ag wire) = 0.44 V vs. SHE at pH = 0, 25 °C and atmospheric pressure.
