![Synthesis, characterization, and applications of a novel poly(4-[pyrrol-1-yl methyl]benzoic acid)–silver composite Cover](https://paradigm-files.s3.eu-central-1.amazonaws.com/MSP/cover-image.jpg)
Figure 1
Voltammograms of silver recorded from an FTO/glass electrode immersed in an aqueous solution containing 0.1 M NaNO3 and 5 × 10−2 M AgNO3 at υ = 100 mV/s with pH 5. (a) First run and (b) successive scans.
Figure 2
Cyclic voltammetry curves of the monomer on an FTO/glass electrode recorded from a solution containing 4 × 10−3 M monomer, 10−1 M acetonitrile, and 10−1 M LiClO4, at the scanning speed of υ = 100 mV/s. (a) First run and (b) successive scans.
Figure 3
Cyclic voltammograms of silver dissolution on the FTO/Glass electrode modified with a polymer film in an aqueous solution containing 0.1 M NaNO3 and recorded at the speed of υ = 100 mV/s. (a) First run and (b) successive scans.
Figure 4
(a) Nyquist diagrams of the FTO electrode prior to and after insertion of silver microparticles into the polymer film PPy-b relative to: (A) FTO electrode, (B) FTO electrode modified by the polymer film, and (C) after insertion and reduction of silver microparticles into PPy-b. (b) A zoom-in view of the region of low impedance.
Table 1
Fitted values of the components of electrical equivalent circuits of EIS data.
| Electrode | R s (Ω) | R ct (MΩ) | C p (μF) | Z W (kΩ/s½) |
|---|---|---|---|---|
| PPy-b/FTO | 164 | 2.87 | 2.93 | — |
| Ag + PPy-b/FTO | 107 | 0.164 | 4.28 | 98.9 |
Table 2
Measured thickness and resistivity data.
| Film | FTO | PPy-b | PPy-b + Ag |
|---|---|---|---|
| Thickness (nm) | 550 | 385 | 385 |
| Resistivity (Ω cm) | 8.22 × 10−4 | 12.2 × 10−4 | 7.4 × 10−5 |
Figure 5
SEM surface images of: (a) a film of PPy-b deposited on an FTO electrode and (b) a modified FTO/polymer (PPy-b) electrode after insertion and reduction of silver microparticles.
Figure 6
XRF spectrum measured after the insertion and reduction of silver into the polymer film PPY-b.
Figure 7
AFM surface images of: (a) a film of PPy-b deposited on an FTO electrode and (b) a modified FTO/polymer (PPy-b) electrode after insertion and reduction of silver microparticles.
Figure 8
Spectral distributions recorded from the films in the UV–visible range. Curve A: FTO substrate; curve B: polymer; curve C: inserted silver.
Figure 9
Characteristic I(V) of the composite (polymer + Ag)/FTO.
Figure 10
Determination of the reverse saturation current of the composite.
Figure 11
Recorded voltammograms of water reduction in 0.1 M NaOH of different electrodes at the scanning speed of 100 mV/s.