Concentration (mg∙L−1) | Rs (Ω cm2) | Rp (Ω cm2) | CPE (Fs−(1−n) cm−2) | n | Cdl (μF cm−2) | ηE (%) |
−0.3 [V vs. SCE] |
|
|
|
|
|
|
0 HEDP | 7.96 | 4.34 × 103 | 4.10 × 10−4 | 0.780 | 81.5 | -- |
20 HEDP | 6.29 | 6.20 × 103 | 3.20 × 10−4 | 0.810 | 74.6 | 30.0 |
30 HEDP | 7.83 | 5.89 × 103 | 2.34 × 10−4 | 0.800 | 48.4 | 26.3 |
50 HEDP | 14.5 | 6.91 × 103 | 1.54 × 10−4 | 0.790 | 30.4 | 37.2 |
100 HEDP | 13.4 | 7.73 × 103 | 2.10 × 10−4 | 0.780 | 40.0 | 43.8 |
50 HEDP + 10 Ca2+ | 8.11 | 7.45 × 103 | 2.50 × 10−4 | 0.840 | 76.7 | 41.7 |
50 HEDP + 20 Ca2+ | 22.1 | 6.05 × 103 | 2.54 × 10−4 | 0.780 | 58.8 | 28.3 |
50 HEDP + 30 Ca2+ | 7.69 | 4.55 × 103 | 3.47 × 10−4 | 0.761 | 53.9 | 4.61 |
50 HEDP + 10 Zn2+ | 6.74 | 4.89 × 103 | 2.96 × 10−4 | 0.810 | 68.8 | 11.2 |
50 HEDP + 20 Zn2+ | 8.84 | 5.72 × 103 | 2.84 × 10−4 | 0.850 | 98.7 | 24.1 |
50 HEDP + 30 Zn2+ | 21.1 | 5.00 × 103 | 3.95 × 10−4 | 0.763 | 89.2 | 13.2 |
50 HEDP + 10 Mg2+ | 9.72 | 6.04 × 103 | 2.14 × 10−4 | 0.830 | 60.4 | 28.1 |
50 HEDP + 20 Mg2+ | 9.96 | 4.94 × 103 | 2.70 × 10−4 | 0.830 | 80.3 | 12.1 |
50 HEDP + 30 Mg2+ | 7.04 | 5.82 × 103 | 3.51 × 10−4 | 0.790 | 71.1 | 25.4 |
Ecorr [V vs. SCE] |
|
|
|
|
|
|
0 HEDP | 7.95 | 5.64 × 103 | 3.21 × 10−4 | 0.790 | 65.6 | -- |
20 HEDP | 7.32 | 7.57 × 103 | 1.17 × 10−4 | 0.850 | 33.6 | 25.5 |
30 HEDP | 7.68 | 8.77 × 103 | 1.10 × 10−4 | 0.860 | 34.7 | 35.7 |
50 HEDP | 10.1 | 8.80 × 103 | 2.05 × 10−4 | 0.840 | 63.2 | 35.9 |
100 HEDP | 13.3 | 8.23 × 103 | 1.56 × 10−4 | 0.780 | 27.3 | 31.5 |
50 HEDP + 10 Ca2+ | 8.01 | 9.52 × 103 | 1.18 × 10−4 | 0.880 | 45.6 | 40.7 |
50 HEDP + 20 Ca2+ | 21.0 | 8.89 × 103 | 9.56 × 10−5 | 0.840 | 29.3 | 36.5 |
50 HEDP + 30 Ca2+ | 7.55 | 8.59 × 103 | 1.35 × 10−4 | 0.810 | 26.8 | 34.3 |
50 HEDP + 10 Zn2+ | 6.67 | 8.80 × 103 | 1.26 × 10−4 | 0.850 | 36.1 | 35.9 |
50 HEDP + 20 Zn2+ | 9.58 | 8.90 × 103 | 1.61 × 10−4 | 0.880 | 66.5 | 36.6 |
50 HEDP + 30 Zn2+ | 20.4 | 7.62 × 103 | 2.65 × 10−4 | 0.800 | 71.8 | 26.0 |
50 HEDP + 10 Mg2+ | 9.74 | 9.22 × 103 | 9.55 × 10−5 | 0.880 | 36.9 | 38.8 |
50 HEDP + 20 Mg2+ | 9.94 | 8.67 × 103 | 1.15 × 10−4 | 0.880 | 45.6 | 34.9 |
50 HEDP + 30 Mg2+ | 7.04 | 7.89 × 103 | 2.29 × 10−4 | 0.810 | 50.7 | 28.5 |
0.1 [V vs. SCE] |
|
|
|
|
|
|
0 HEDP | 8.97 | 6.12 × 103 | 1.00 × 10−4 | 0.820 | 21.4 | -- |