Efficient Nickel Sulfide and Graphene Counter Electrodes Decorated with Silver Nanoparticles and Application in Dye-Sensitized Solar Cells

Table 1 Electrochemical parameters made from the impedance spectra and CVs of various CEs

Electrodes	R _s (Ω cm⁻²)	R _ct (Ω cm⁻²)	Z _w (Ω cm⁻²)	J ₀ (mA cm⁻²)	\|I _pc\| (mA cm⁻²)	\|V _pc\| (mV)	\|E _pp\| (mV)
Pt	5.50 ± 0.02	2.78 ± 0.02	0.88 ± 0.02	1.35 ± 0.01	3.18 ± 0.02	0.16 ± 0.01	0.27 ± 0.01
Graphene	8.10 ± 0.02	6.59 ± 0.02	3.44 ± 0.02	0.96 ± 0.01	2.13 ± 0.02	0.25 ± 0.01	0.42 ± 0.01
NiS	7.33 ± 0.02	5.45 ± 0.02	3.76 ± 0.02	1.05 ± 0.01	2.46 ± 0.02	0.24 ± 0.01	0.39 ± 0.01
NiS/Gr	6.83 ± 0.02	3.65 ± 0.02	2.01 ± 0.02	1.11 ± 0.01	2.71 ± 0.02	0.20 ± 0.01	0.33 ± 0.01
NiS/Ag	6.19 ± 0.02	3.18 ± 0.02	1.49 ± 0.02	1.19 ± 0.01	2.95 ± 0.02	0.19 ± 0.01	0.32 ± 0.01
NiS/Gr-Ag	4.05 ± 0.02	2.17 ± 0.02	0.70 ± 0.02	1.88 ± 0.01	3.43 ± 0.02	0.17 ± 0.01	0.25 ± 0.01