Fig. 5
From: Anchoring zero valence single atoms of nickel and iron on graphdiyne for hydrogen evolution
HER activities and stabilities of Ni/GD and Fe/GD. a Polarization curves of (i) Pt/C, (ii) Fe/GD, (iii) Ni/GD, (iv) GDF, and (v) CC (inset: enlarged view of the LSV curves for Fe/GD and Ni/GD near the onset region). b Onset values and c overpotentials at 10 mA cm−2 of Ni/GD and Fe/GD (red square) along with other nonprecious single-atom HER catalysts (green circle) and several bulk catalysts (olivine triangle). d Mass activities of Ni/GD, Fe/GD, and Pt/C (inset: mass activities obtained at overpotentials of 0.05 and 0.20 V). e Tafel plots of the presented data in a. f TOF values of Fe/GD (blue dot) and Ni/GD (red dot) together with several state-of-the-art HER electrocatalysts. g Nyquist plots of experimental data (dots) and fitting results (circles) for Fe/GD, Ni/GD, GDF, and CC. Stability tests of h Ni/GD and i Fe/GD (insets: respective time-dependent current density curves)
