Figure 3. Electrocatalytic performance of different catalysts.

(a) The polarization curves recorded on MoS_2(1-x)Se_2x/NiSe₂ foam hybrid, MoS₂/NiSe₂ foam hybrid and pure NiSe₂ foam electrodes compared with a Pt wire. (b) Tafel plots recorded on the catalysts in a. (c) Polarization curves showing negligible current density loss of ternary MoS_2(1−x)Se_2x/NiSe₂ hybrid electrodes initially, after 1,000 CV cycles and after the stability test. (d) Time dependence of current densities −10 and −140 mA cm⁻² recorded on the MoS_2(1−x)Se_2x/NiSe₂ hybrid electrode under given potentials of −69 and −121 mV, respectively. (e) Plot showing the extraction of the C_dl from different electrodes. (f) Electrochemical impedance spectroscopy (EIS) Nyquist plots of different electrocatalysts. The data were fit to the simplified Randles equivalent circuit shown in the inset. The loading of MoS_2(1−x)Se_2x catalyst is 4.5 mg cm⁻².