按2.3的方法制备[(2, 2’-bipy/P2Mo18)n]多层复合

Prepare [(2, 2'-bipy/P2Mo18)n] multilayer composite film modified electrode according to the method in 2.3 (n=1, 2, 3,...), and modify it with this after completing the preparation of a layer of composite film The electrode is a working electrode, with a mixed solution of 0.1 mol•L-1 H2SO4 and 0.5 mol•L-1 Na2SO4 with a pH of 6.51 as the supporting electrolyte solution, the potential range is -0.4 V ~ +0.6 V, and the sweep speed is 100 mV• s-1, perform cyclic voltammetry scan. Compare and observe the changes in the response current of the electrode under different modified layers. Using the modified electrode modified with different layers of composite film as the working electrode, perform cyclic voltammetry scanning under the same conditions, superimpose the obtained cyclic voltammograms, and study the differences The electrochemical behavior of the modified electrode under the number of modified layers is shown in Figure 2 (a and b). As shown in Figure 2(a), as the number of modified layers increases, the redox peak current in the cyclic voltammogram of the modified electrode increases significantly, and the peak potentials corresponding to all redox peaks remain almost unchanged. It can be seen from Figure 2(b) that taking oxidation peak II' as an example, there is a good linear relationship between the peak current and the number of modified layers, which indicates that the 2, 2'-bipy and P2Mo18 in the multilayer film are uniformly modified to The surface of the glassy carbon electrode, and 2, 2'-bipy has no effect on the electron transfer process between the P2Mo18 molecule and the glassy carbon electrode [161]. When the number of modified layers of the {2, 2'-bipy/P2Mo18} composite film is n>10, the response current of the oxidation peak corresponding to the modified electrode deviates from linearity. This may be because the P2Mo18 deposited on the outermost layer is far away from the electrode surface so that the transfer of electrons through the film becomes difficult. Therefore, the number of modified layers is preferably 10, which is recorded as [(2,2'-bipy/P2Mo18)10].

Prepare the multi-layer composite film modification electrode (n=1,2,3,...... ), for each layer of composite film preparation, this modifies the electrode to work extremely well, at 0.1 mol-L-1 H2SO4 with a pH of 6.51 and 0.5 mol-L-5 1 Na2SO4 mixed solution is an electrolyte-supporting solution with a potential range of -0.4 V to 0.6 V and a sweep speed of 100 mV-s-1 for a circular VN scan. Comparing and observing the change of the response current of electrodes under the number of different modification layers, the modified electrode is extremely working in order to modify the composite film of different layers, the circulation Vian scan is carried out under the same conditions, the resulting cycle VOANtu is superimposed, and the electrochemical behavior of the modified electrode under the number of different modification layers is studied, as shown in Figure 2 (a and b). As can be known from Figure 2 (a), with the increase in the number of modified layers, the redox peak current in the circular Vian diagram of the modified electrode is significantly enhanced, and the peak level corresponding to all redox peaks remains almost unchanged. As can be known from Figure 2 (b), for example, there is a good linear relationship between peak current and the number of modified layers, which indicates that 2, 2'-bipy and P2Mo18 in the multi-layer membrane are evenly modified to the surface of the glass carbon electrode, and 2, 2'-bipy has no effect on the electron transfer process between the P2Mo18 molecule and the glass carbon electrode. When the modified layer number n>10 of the composite film is n>10, the oxidation peak response current corresponding to the modified electrode is deviated from linearity. This may be due to the deposition of P2Mo18 in the outermost layer away from the electrode surface so that the transfer of electrons through the membrane becomes difficult. So the decoration layer numbers are 10 layers as the best, as (2,2'-bipy/P2Mo18)10.

The [(2,2 '- bipy / p2mo18) n] multilayer composite film modified electrode (n = 1,2,3,...) was prepared by the method of 2.3 When the composite film was prepared, the modified electrode was used as the working electrode, and the mixed solution of 0.1 mol · L-1 H2SO4 and 0.5 mol · L-1 Na2SO4 with pH value of 6.51 was used as the supporting electrolyte solution. The potential range was - 0.4 V ~ + 0.6 V, and the sweep rate was 100 MV · s-1. The response current of the modified electrode with different number of modified layers was observed. The modified electrode with different number of modified layers was used as the working electrode. Cyclic voltammetry scanning was carried out under the same conditions. The cyclic voltammograms obtained were superimposed to study the electrochemical behavior of the modified electrode with different number of modified layers, as shown in Fig. 2 (A and b). It can be seen from Fig. 2 (a) that with the increase of the number of modified layers, the redox peak currents in the cyclic voltammograms of the modified electrode are significantly enhanced, and the corresponding peak potentials of all redox peaks remain almost unchanged. As can be seen from Fig. 2 (b), taking oxidation peak II 'as an example, there is a good linear relationship between the peak current and the number of modified layers, which indicates that 2,2' - bipy and p2mo18 in the multilayer film are uniformly modified on the surface of the glassy carbon electrode, and 2,2 '- bipy has no effect on the electron transfer process between p2mo18 molecule and the glassy carbon electrode [161]. When the number of modified layers of {2,2 '- bipy / p2mo18} composite film is n > 10, the corresponding oxidation peak response current of the modified electrode deviates from the linearity. This may be due to the fact that p2mo18 deposited on the outermost layer is far away from the electrode surface, which makes it difficult to transfer electrons through the film. Therefore, the number of modified layers is 10, which is recorded as [(2,2 '- bipy / p2mo18) 10].<br>