Papers by Keyword: Electroactivity

Abstract: Recently, many efforts have been made to develop new anode materials able to catalyze the oxygen electroevolution reaction (OER). This review summarizes recent work undertaken on production and electroactivity of practical anode materials for an alkaline water electrolysis. Examples of mixed oxides with ABO₃ perovskite-type structure, metal compounds crystallizing in the spinel structure, electrolytic coatings of nickel alloys, as well as amorphous nickel-and cobalt-based electrolytic composite coatings, have been presented. The effect of the phase composition of the anode material on its activity in the OER, has also been discussed.

Abstract: Polymethylmethacrylated oligoaniline was synthesized by methylmethacrylate radical polymerization in the presence of oligoaniline. By means of IR-spectroscopy polymethylmethacrylated oligoaniline was characterized and its degree of oxidation was showed to be conserved. With the use of cyclic voltammetry its electroactivity was found to be preserved after modification.

Abstract: Optical and photoelectrochemical properties of polybithiophene Poly (bTh) films electrochemically synthesized and modified with incorporation of silicon nanoparticles (n-Si or p-Si) dispersed in the electrolytic during polymerization were studied. The characterisation of these modified surface electrodes by Poly (bTh)+n-Si or Poly (bTh)+p-Si, was carried out by using the photocurrent measurements and UV-visible spectroscopy. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) have been used to investigate the electrochemical behaviour of the resulting materials. The results show that the photosensitive composite materials have good photoelectrochemical and optical properties, and it can be used as material for the photovoltaic cells applications.

Abstract: Nanocomposite based on polyaniline (PANI) and α-zirconium phosphate (α-ZrP) has been synthesized by in situ polymerization using aniline intercalation compound (ANI)/ZrP as intermediate. Aniline was successfully intercalated into the interlayer spacing of crystalline α-ZrP forming a double-phase intermediate by adsorption. The intercalated aniline was polymerized by adding appropriate amount of ammonium peroxodisulphate (APS) solution. The synthesized nanocomposites were characterized by XRD, SEM, and FT-IR. X-ray diffraction patterns showed that PANI was formed outside α-ZrP. TGA/DSC analysis showed improved thermal stability for the PANI/ZrP nanocomposite in comparison with pure PANI. The PANI/ZrP nanocomposite was studied by cyclic voltammetry (CV), which revealed good redox activity and electrochemical-cycling stability in acidic solution. The interaction between PANI and nanosheets greatly affected the electrochemical behavior of PANI/ZrP nanocomposite. The electrochemical behavior of PANI/ZrP nanocomposite in HCl solution with different pH values has been studied in detail.

Abstract: A steady layered organic-inorganic perovskite hybrid containing Fe³⁺ was prepared in the air with phenosafranine as organic sheets, the Fe(CN)₆^3- as inorganic sheets. We utilized the Fe(CN)₆^3- as inorganic sheets of perovskite hybrids, which may help to stabilize the unusual metal-deficient layered structures. The results of X-ray diffractometry (XRD) and scanning electron microscopy (SEM) show that the hybrid is typical layered perovskite structure. The hybrid was mixed with paraffin to form a hybrid paste for the hybrid paste electrode. Electrochemical characteristics of carbon paste electrode (CPE) modified by hybrid were investigated with cyclic voltammetry. The modified electrode can accelerate the electron-transfer to improve the electrochemical reaction reversibility and be use for the determination of chemicals. The interactions between sodium nitrite (NaNO₂), sodium bromide (NaBr), hydroxylammonium chloride (NH₂OH·HCl), hydroquinone (C₆H₆O₂) with hybrid were studied. The modified electrode exhibits good electrochemical activity. The hybrid can be used as electrochemical materials.

Abstract: Electroactivity of graphite nanofibers (GNFs)-supported PtRu particles was examined for their application as DMFCs anode. In this work, composites of PtRu nanoparticles of 2-8 nm size and graphite nanofibers were prepared by the electrodeposition methods. As a result, the methanol oxidation current for graphite nanofibers-supported PtRu catalysts was investigated by changing a deposition time. The electroactivity could be attributed to the particle size, particle dispersion ability, and deposition level.