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High-resolution XPS spectra of (A) Pb 4f and (B) O 1s in catalyst films after maintaining an OER current of 1 mA cm–2 in 0.1 M KPi + 1 M KNO3 pH 2.5 for 10 min: PbOx (gray line), FePbOx (mustard line), NiFePbOx (blue line), and NiPbOx (red line).
