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Table 2 Fitting impedance parameters of Nyquist plots using the equivalent circuit in Fig. 10b

From: Preparation of SnIn4S8/TiO2 Nanotube Photoanode and Its Photocathodic Protection for Q235 Carbon Steel Under Visible Light

Samples Rs (Ω cm2) Qf Rf (Ω cm2) Qdl Rct (kΩ cm2)
103Y01(Sn·Ω−1 cm−2) n1 103Y02(Sn·Ω−1 cm−2) n2
Q235 CS 5.875 1.918 0.825 6.617 1.185 0.809 4.238
TiO2dark 5.220 1.603 0.813 20.84 3.080 0.934 1.343
SnIn4S8/TiO2dark 5.182 3.235 0.885 19.31 3.042 0.936 1.141
TiO2illumination 4.993 2.257 0.922 18.55 1.882 0.949 0.932
SnIn4S8/TiO2illumination 5.343 6.283 0.873 36.47 1.947 0.825 0.278