Synergy of Pseudocapacitive Properties of Ferromagnetic La1 − xSrxMnO3 and Polypyrrole in high Active Mass Composite Electrodes for Supercapacitors

Journal of Inorganic and Organometallic Polymers and Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

Language: Английский

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Negative Temperature Coefficient of Resistance (NTCR) of Bismuth Manganite Nanoparticles: Polypyrrole Conductivity Enhancement

Journal of Composites Science, Journal Year: 2025, Volume and Issue: 9(5), P. 224 - 224

Published: April 30, 2025

Polypyrrole (PPy)-doped bismuth calcium manganite (BCM) nanocomposites were synthesized by chemical polymerization. The amorphous nature of the polypyrrole and monoclinic crystal structure BCM particles (35–65 nm) confirmed various microstructural, X-ray powder, spectroscopy techniques. DC conductivity analysis via correlated barrier-hopping (CBH) model Mott’s variable-range hopping (MVRH) showed that exhibited ionic conduction. Activation energies, evaluated from Arrhenius plots, PPy/BCM-30 (30 wt.% BCM) had minimum value 0.09 eV, indicating maximum normal NTCR behavior, with resistance decreasing temperature. CBH described conduction process, AC measurements indicated was frequency-independent at lower frequencies but became dispersive frequency-dependent higher frequencies, conforming to Jonscher’s power law. study revealed transport electrical charge in material followed model. These results demonstrate how promising PPy/BCM are for energy storage, sensors, electronic materials.

Language: Английский

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Core–Shell Inorganic/Organic Composites Composed of Polypyrrole Nanoglobules or Nanotubes Deposited on MnZn Ferrite Microparticles: Electrical and Magnetic Properties

Journal of Composites Science, Journal Year: 2024, Volume and Issue: 8(9), P. 373 - 373

Published: Sept. 21, 2024

Core–shell inorganic/organic composites have often been applied as fillers in electromagnetic interference shielding. Those composed of conducting polymers and ferrites are particular interests with respect to their electrical magnetic properties. Pyrrole was oxidized aqueous medium the presence manganese-zinc ferrite microparticles ammonium peroxydisulfate or iron(III) chloride yield polypyrrole-coated, core–shell microstructures. The effect methyl orange dye on conversion globular polypyrrole nanotubes has demonstrated by electron microscopy when used an oxidant. formation proved FTIR spectroscopy. completeness coating confirmed Raman resistivity composite powders determined four-point van der Pauw method a function pressure up 10 MPa. conductivity matrix only moderately decreased increasing content ferrite. highest composites, 13–25 S cm−1, achieved after deposition nanotubes. Magnetic properties not affected moiety, magnetization proportional content.

Language: Английский

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Ultrasonic-Assisted Electrodeposition of Mn-Doped NiCo2O4 for Enhanced Photodegradation of Methyl Red, Hydrogen Production, and Supercapacitor Applications

Journal of Composites Science, Journal Year: 2024, Volume and Issue: 8(5), P. 164 - 164

Published: April 29, 2024

This paper presents a novel ultrasonic-assisted electrodeposition process of Mn-doped NiCo2O4 onto commercial nickel foam in neutral electroplating bath (pH = 7.0) under an ultrasonic power 1.2 V and 100 W. Different sample properties were studied based on their crystallinity through X-ray diffraction (XRD), morphology was scanning electron microscopy (SEM), photodegradation ultraviolet–visible (UV–Vis) spectrophotometry. Based the XRD results, dominant crystallite phase obtained shown to be pure single phase. The optical photocatalytic film showed range energy band gaps between 1.72 1.73 eV from absorption spectrum. surface hydroxyl groups catalytic thin films significant improvements removing methyl red via photodegradation, achieving 88% degradation 60 min, which approximately 1.6 times higher than that films. maximum hydrogen rate composite mW/cm2 illumination 38 μmol/cm2 with +3.5 external potential. electrochemical performance test also high capacity retention (96% after 5000 charge–discharge cycles), (260 Fg−1), low intrinsic resistance (0.8 Ω). work concludes hybrid oxygen-poor conditions (oxygen vacancies) is promising electrode candidate for removal, evolution, high-performance supercapacitor applications.

Language: Английский

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Magnetic CuFe2O4 Spinel–Polypyrrole Pseudocapacitive Composites for Energy Storage

Materials, Journal Year: 2024, Volume and Issue: 17(21), P. 5249 - 5249

Published: Oct. 28, 2024

This investigation focused on the fabrication of ceramic ferrimagnetic CuFe2O4–conductive polypyrrole (PPy) composites for energy storage. CuFe2O4 with a crystal size 20–30 nm and saturation magnetization 31.4 emu g−1 was prepared by hydrothermal synthesis, PPy chemical polymerization. High-active-mass composite electrodes were fabricated storage in supercapacitors operation sodium sulfate electrolyte. The addition to resulted decrease charge transfer resistance an increase capacitance range from 1.20 F cm−2 (31 g−1) 4.52 (117.4 at 1 mV s−1 sweep rate 1.17 (29.9 4.60 (120.1 3 mA current density. showed higher than other magnetic same mass containing potential exhibited improved cyclic stability. behavior influenced properties paramagnetic PPy. valuable combination capacitive enriched materials science novel applications based magnetoelectric magnetocapacitive properties.

Language: Английский

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