Facile self-assembled Prussian blue-polypyrrole nanocomposites on glassy carbon: Comparative synthesis methods and its electrocatalytic reduction towards H 2 O 2 (original) (raw)
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Journal of Solid State Electrochemistry, 2000
Functionalized polypyrrole films were prepared by incorporation of Fe(CN)63− as doping anion during the electropolymerization of pyrrole at a glassy carbon electrode from aqueous solution. The electrochemical behavior of the Fe(CN)63−/Fe(CN)64− redox couple in polypyrrole was studied by cyclic voltammetry. An obvious surface redox reaction was observed and dependence of this reaction on the solution pH was illustrated. The electrocatalytic ability of polypyrrole film with ferrocyanide incorporated was demonstrated by oxidation of ascorbic acid at the optimized pH of 4 in a glycine buffer. The catalytic effect for mediated oxidation of ascorbic acid was 300 mV and the bimolecular rate constant determined for surface coverage of 4.5 × 10−8 M cm−2 using rotating disk electrode voltammetry was 86 M−1 s−1. Furthermore, the catalytic oxidation current was linearly dependent on ascorbic acid concentration in the range 5 × 10−4–1.6 × 10−2 M with a correlation coefficient of 0.996. The plot of i p versus v 1/2 confirms the diffusion nature of the peak current i p.
International journal of electrochemical science
Prussian blue nanoparticles synthesized from K 4[Fe(CN) 6]3H 2O and Fe(NO 3) 3.9H 2O, were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Energy dispersive spectroscopy (EDS), Scanning electron microscopy (SEM), and Raman spectroscopy. Prussian blue nanoparticles were modified on a glassy carbon electrode as a mediator of carbon nanotube; three electrodes GC-Bare, GC-PB and GC-CNT-PB were fabricated. Cyclic voltammetry were employed to characterize electrodes at pH ranges of (3 - 7.4) in 0.1M phosphate buffer solution, in the absence or presence of 25 μM of H 2O 2. Compared with Prussian blue (PB) modified on glassy carbon electrode (GC-PB), the GC-CNT-PB electrode exhibits much electrochemical stability, much wider pH range and high response currents for the reduction of hydrogen peroxide (H 2O 2).
FeCo-Polypyrrole nanocomposites supported on porous carbon for electrochemical application
Advanced Materials Letters, 2019
The synthesis and characterization of pyrolyzed carbon-supported transition metal/nitrogen (M-Nx/C) material based on FeCo alloy and Polypyrrol as source of N atoms are presented. Two different synthetic protocols, a multi-step and a novel one pot single-step approach are compared. In both approaches two different Fe:Co ratio (50:50 and 75:25) were used to obtain Pt-free FeCo-Polypyrrole nanocomposites supported on porous carbon (FeCo/Ppy@C). Structural and morphological characterizations of the samples before and after pyrolysis were carried out by using X-Ray Powder Diffracion, Infrared Spectroscopy and High-Resolution Transmission Electron Microscopy. For both approaches, nanoparticles with a core shell structure but different size and matrix polidispersivity were observed after pyrolysis when a Fe:Co 50:50 ratio was used. Bigger nanoparticles were obtained after pyrolysis in the 75:25 ratio samples, with no significant differences between the two approaches. The electrocatalytical properties of the final samples, investigated by cyclic voltammetry in an acidic electrolyte, showed the presence of a cathodic current density.