Extended Data Fig. 4: Tafel plots of Pt(111) and *OD/*OH adsorption coverage in base.

(A) Tafel plots of Pt(111) in O₂-sat. 0.1 M NaOH in H₂O and D₂O at 1600 rpm based ORR polarization profiles in Supplementary Fig. 6. (B) *OD and *OH adsorption coverage on Pt(111) in alkaline D₂O and H₂O as a function of potentials extracted from Fig. 4A.

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