Preparation of a phosphopolyoxomolybdate P2Mo18O626− doped polypyrrole modified electrode and its catalytic properties

Electrochemical behaviour of a new triiron-substituted polyoxomolybdate

“…Thus, for all observed peaks (A1/C1-A3/C3), the plots I p versus pH show that the peak current of the PFe 3 Mo 9 complex presents a maximum at pH *2.5 (results not shown). Furthermore, as expected, the cyclic voltammograms recorded for the PFe 3 Mo 9 complex in acidic media are gradually shifted towards more positive potentials with the pH decrease [47,49,53]. As Fig.…”

“…This statement is supported by the electrochemical behaviour observed for the similar SiFe III W 11 complex [51,52], where the peak attributed to the Fe 3+ /Fe 2+ couple is placed at a more positive potential than those corresponding to the SiW 11 ligand [51,52]. The PMo 9 ligand is stable in acidic media [44,49,53,54]. This behaviour was also confirmed for the PFe 3 Mo 9 complex.…”

“…4a, Table 1), indicate quasi-reversible redox processes for freely diffusing redox couples [47]. However, the slopes of the log-log dependence between the peak currents and the potential scan rate for the peaks of PFe 3 Mo 9 complex (Table 2) reveal that the absorption of the complex on the electrode surface is not negligible (the calculated values of the slopes are significantly higher than 0.5, but lower than 1) [45,[47][48][49]. All these findings indicate that the redox processes involved in the electrochemical activity of PFe 3 Mo 9 are mixed ones, being both diffusion-and surface-controlled [49,50].…”

Mercaptoethane sulfonate protected, water-soluble gold and silver nanoparticles: Syntheses, characterization and their building multilayer films with polyaniline via ion–dipole interactions

“…After rinsed to remove the loosely adsorbed material, the quartz slide is found to become green, indicative of adsorbing a layer of PANI-EB film, and subsequently dipped into acidic Au-MES or Ag-MES aqueous solution, the PANI-EB adsorbed on the quartz slide will be immediately protonated and simultaneously doped by the anions in the solution, accompanying by a color change from green (PANI-EB) to blue (doped PANI). Due to the bulk volume and strong negative charges, the Au-MES or Ag-MES nanoparticles will be preferentially doped in PANI as compared to the other small anions like chloride [55]. As a result, the surface charges of the quartz slide will change from the positive to the negative by the excess adsorption.…”

Voltammetric behaviour study of creatinine at phosphomolybdic-polypyrrole film modified electrode

“…In the above-mentioned methods, POMs entrapped into conducting polymers film modified electrodes are regarded as the most promising one because the modified electrodes thus prepared have the characteristics of both the conducting polymer and the POMs [18], in addition, it has no limitations of other methods [19]. Polypyrrole (PPy) is one of the most studied polymers, it can be easily obtained by anodic oxidation from the monomer in solution, both in aqueous and non-aqueous medium [20], and the incorporation of anions can be performed via electrochemistry simultaneously with the polymer synthesis [21,22].…”