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. 2019 Apr 4;10:1543. doi: 10.1038/s41467-019-09162-5

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© The Author(s) 2019

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Fig. 2 — Catalytic activity of HfN_xO_y. a Comparative electrochemical behavior of Pt foil and thin film HfN_xO_y electrodes in acidic media highlighting the high activity of HfN_xO_y for hydrogen evolution and oxidation reactions. Inset: Tafel plots. b Expanded view of the activity near zero potential. Inset: Mass activity. Scan rate: 5 mV s⁻¹ in H₂-purged 0.1 M HClO₄. The non-faradaic current at 5 mV s⁻¹ scan rate is negligible, which is shown in Supplementary Figure 5