Figure 3

(a) Polarization curves; (b) Tafel plots; (c) Nyquist plots of (Fe_0.2Ni_0.8)_0.96S TSs/Ni, FeNi-LDH Ss/Ni measured at overpotential of 330 mV; (d) Chronoamperometric measurement of the (Fe_0.2Ni_0.8)_0.96S TSs/Ni at an overpotential of 154 mV. Inset is the polarization curves before and after 1000 cycles.