The averaged results of fitting of the impedance spectra obtained as a function of cMo using EECs from Fig. 8: S is the residual sum of squares and indicate the quality of the fit; Rs is the solution resistance; Tdl and αdl are parameters of CPEdl representing the electrical double layer; Rct is the charge-transfer resistance; the resistance R2 and the constant phase element CPE2 with parameters T2 and α2 correspond to adsorption process, either heteropolyoxomolybdate or atomic hydrogen, R1 and L1 are related to liberation of hydrogen bubbles, uncertainties of the fitted parameters were calculated using eqn (3), n is the number of experiments.
| c Mo mM | n | R s Ω cm2 | T dl μF sα−1·cm−2 | α dl | R ct Ω cm2 | R 1 Ω cm2 | L 1 H cm2 | T 2 mF sα−1·cm−2 | α2 | R 2 Ω cm2 |
|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 3 | 9(1) | 739(269) | 0.89(0.04) | 26(3) | 219(170) | 2505(2679) | 110(101) | 0.99(0.04) | 11(5) |
| 10 | 4 | 11(2) | 122(61) | 0.89(0.01) | 165(74) | 55(25) | 0.98(0.05) | 68(27) | ||
| 50 | 4 | 8(1) | 91(52) | 0.88(0.01) | 266(190) | 24(20) | 0.98(0.06) | 147(140) | ||
| 100 | 6 | 7(1) | 56(19) | 0.85(0.01) | 1000(621) | 6(4) | 0.92(0.04) | 907(795) |