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. 2022 Feb 18;5:20. doi: 10.1038/s42004-022-00635-1

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Fig. 1 — Representative cyclic voltammogram (CV) of the Pt disk at 20 mV s^–1 in N₂-sat’ed HClO₄, H₂SO₄, and HNO₃. Dashed regions indicate approximate divisions of potential ranges as indicated along the top: hydrogen evolution reaction (HER) region, hydrogen under-potential deposition (H_UPD) region, double layer capacitance region, and surface Pt oxidation/PtO_x reduction region. Color code: HClO₄ (blue), HNO₃ (red), and H₂SO₄ (olive).