Table 1.

Rct values obtained from EIS measurements for ZnO samples on carbon paper.

Sample (S)	ZnO (Ω)	ZnO + KCl (Ω)	ZnO + NH4F (Ω)	ZnO + EDA (Ω)
S	9.35 ± 1.28	4.27 ± 0.69	3.56 ± 0.66	2.90 ± 0.61
S + AChE	9.56 ± 2.30	10.73 ± 0.81	9.85 ± 1.21	9.42 ± 0.39
S + AChE + ATCl	11.36 ± 1.54	10.55 ± 0.83	10.52 ± 1.37	9.60 ± 0.44
S + AChE + OP + ATCl	18.77 ± 2.47	15.24 ± 2.67	13.88 ± 2.38	11.4 ± 0.69