fig14

Figure 14. (A-C) SEM, d) TEM and (E, F) corresponding HRTEM images of enlarged red frame area from (D) for Ni₃S₂/NF. (G) Proposed formation mechanism of Ni₃S₂/NF. (H) LSV curves at a scan rate of 5 mV s^-1 with iR correction. (I) Corresponding Tafel plots of Ni₃S₂/NF, Ni₃S₂-NF, Pt/C-NF and NF. (J) CV curves of Ni₃S₂/NF at different scanning rates of 20-200 mV s^-1 in the potential window of 0.1-0.2 V (inset: linear fitting of the capacitive currents obtained at 0.15 V). (K) EIS Nyquist fitting plots of Ni₃S₂/NF, Ni₃S₂-NF, Pt/C-NF and NF at the open-circuit potential with an amplitude of 5 mV, inset is the corresponding equivalent circle for fitting. Reproduced with permission. Copyright 2017, American Chemical Society^[133].