Preparation of Polypyrrole Films Doped with Phosphomolybdic Acid in ScCO2/Water Emulsion

2011 ◽  
Vol 233-235 ◽  
pp. 1085-1088 ◽  
Author(s):  
Hao Yan ◽  
Zhang Lin Li ◽  
Fei Fei Xu
Keyword(s):  
Cyclic Voltammetry ◽  
Phosphomolybdic Acid ◽  
Water Emulsion ◽  
Reduction Behavior ◽  
Polypyrrole Films ◽  
Oxidation Reduction ◽  
Bulk Electrolysis ◽  
Voltammetry Methods ◽  
Conventional Systems ◽  
Better Than

In this paper, polypyrrole films doped with phosphomolybdic acid was prepared by bulk electrolysis with coulometry in the ScCO2/Water emulsion system. The films were characterized by Raman and cyclic voltammetry methods. The polypyrrole structure was detected by Raman spectrum. And a stable oxidation-reduction behavior with three groups of peaks attributed to the phosphomolybdic acid doped in polypyrrole was established in the cyclic voltammetry curves. Moreover, the peak current was much better than that of the films prepared in conventional systems under constant pressure without the existence of ScCO2.

scholarly journals Controlling the thermoelectric properties of polymers: application to PEDOT and polypyrrole

2015 ◽  
Vol 17 (23) ◽  
pp. 15140-15145 ◽  
Author(s):  
Mario Culebras ◽  
Belén Uriol ◽  
Clara M. Gómez ◽  
Andrés Cantarero
Keyword(s):  
Cyclic Voltammetry ◽  
Thermoelectric Properties ◽  
Electronic States ◽  
Polypyrrole Films ◽  
Oxidation Reduction ◽  
Electrode Cell

Poly(3,4-ethylenedioxythiophene) and polypyrrole films have been prepared electrochemically in a three electrode cell. The films have been obtained at different oxidation levels (bipolaron, polaron and neutral states) by varying the voltage. Fig. (a) and (b) correspond to the cyclic voltammetry of the films, while (c) is a scheme of the electronic states as a function of the oxidation/reduction level.

Studies on electrooxidation of lignin and lignin model compounds. Part 1: Direct electrooxidation of non-phenolic lignin model compounds

Holzforschung ◽  
2012 ◽  
Vol 66 (3) ◽  
Author(s):  
Takumi Shiraishi ◽  
Toshiyuki Takano ◽  
Hiroshi Kamitakahara ◽  
Fumiaki Nakatsubo
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Carbonyl Compounds ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Bulk Electrolysis ◽  
Lignin Model ◽  
Dimeric Compound ◽  
High Yields ◽  
Short Time

Abstract The direct anodic oxidation of non-phenolic lignin model compounds was investigated to understand their basic behaviors. The results of cyclic voltammetry (CV) studies of monomeric model, such as 1-(4-ethoxy-3-methoxyphenyl)ethanol, are interpreted as the oxidation for Cα-carbonylation did not proceed in the reaction without a catalyst, but a base promotes this reaction. Indeed, the bulk electrolyses of the monomeric lignin model compounds with 2,6-lutidine afforded the corresponding Cα-carbonyl compounds in high yields (60–80%). It is suggested that deprotonation at Cα-H in the ECEC mechanism (E=electron transfer and C=chemical step) is important for Cα-carbonylation. In the uncatalyzed bulk electrolysis of a β-O-4 model dimeric compound, 4-ethoxy-3-methoxyphenylglycerol-β-guaiacyl ether, the corresponding Cα-carbonyl compound was not detected but as a result of Cα-Cβcleavage 4-O-ethylvanillin was found in 40% yield. In the electrolysis reaction in the presence of 2,6-lutidine (as a sterically hindered light base), the reaction stopped for a short time unexpectedly. These results indicate the different electrochemical behavior of simple monomeric model compounds and dimeric β-O-4 models. The conclusion is that direct electrooxidation is unsuitable for Cα-carbonylation of lignin.

Effect of the Additives on the Catalytic Performance of Iron-Ruthenium Composite Catalyst

2010 ◽  
Vol 160-162 ◽  
pp. 671-675
Author(s):  
Qing Jie Tang ◽  
Shao Fan ◽  
Bo Liu
Keyword(s):  
Catalytic Performance ◽  
Experimental Results ◽  
Composite Catalyst ◽  
Reduction Behavior ◽  
Iron Based ◽  
Reduction Effect ◽  
Better Than

A series of Iron-Ruthenium composite catalyst were prepared by precipitation and immersion, the effect of potassium and copper were studied by the slurry bed reactor at 260°C、2MPa、CO／H2＝1∶1，and the reduction behavior of Iron-Ruthenium composite catalyst was studied by TPR. The experimental results showed that the performance of Iron-Ruthenium composite catalyst was better than single Iron-based catalyst. The addition of potassium and copper caused the catalytic performance of Iron-Ruthenium composite catalyst improve significantly, and Copper could improve significantly reduction effect on Iron-Ruthenium composite catalyst.

Structure-Optical Property Relationships of Porphyrins

1997 ◽  
Vol 479 ◽  
Author(s):  
Weijie Su ◽  
Thomas M. Cooper ◽  
Nansheng Tang ◽  
Doug Krein ◽  
Hao Jiang ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Optical Properties ◽  
Optical Property ◽  
Fluorescence Lifetimes ◽  
Structural Variations ◽  
Reduction Behavior ◽  
Oxidation Reduction ◽  
Optical Applications ◽  
The Relationship

AbstractPorphyrins are attractive compounds for optical applications. We have been investigating the relationship between molecular structure and optical properties of a number of porphyrin compounds. Structural variations explored include insertion of metal ions, extension of conjugation, halogenation and formation of multimers. The characterization of these chromophores includes measurement of UV/Vis, fluorescence and fluorescence lifetimes. Furthermore, we have investigated their nonlinear absorption, refraction, excitation dynamics as well as oxidation/reduction behavior. Based on our observations, clear recommendations can be made for the design of optical limiting chromophores.

Formation and modification of polypyrrole films on platinum electrodes by cyclic voltammetry and anodic polarization

Polymer ◽  
1987 ◽  
Vol 28 (4) ◽  
pp. 651-658 ◽  
Author(s):  
T.F. Otero ◽  
R. Tejada ◽  
A.S. Elola
Keyword(s):  
Cyclic Voltammetry ◽  
Anodic Polarization ◽  
Platinum Electrodes ◽  
Polypyrrole Films

CARBON NANOTUBES USED IN ELECTROANALYSIS

2005 ◽  
Vol 19 (01n03) ◽  
pp. 603-605 ◽  
Author(s):  
C. G. HU ◽  
B. FENG
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Cyclic Voltammetry ◽  
Experimental Period ◽  
Cyclic Voltammograms ◽  
Alkaline Aqueous Solution ◽  
Routine Monitoring ◽  
Good Signal ◽  
Better Than

The fabrication of the carboxyl-modified CNT electrode was described. The electroanalytical investigation of sulfadiazine has been conducted in alkaline aqueous solution at the CNT electrode by voltammetry. Highly reproducible and well-defined cyclic voltammograms were obtained for sulfadiazine with a very good signal to background (S/B) ratio. However, no fouling of the electrode was observed at the CNT electrode within the experimental period of several hours, which illustrated that the CNT electrode was much better than traditional electrodes. Meanwhile, the detection of trace sulfadiazine in milk was also conducted by cyclic voltammetry with satisfactory ratio of recovery, indicating that the nanotube electrode can be used in routine monitoring of sulfadiazine residues in food.

ChemInform Abstract: DINUCLEAR IRON(II) COMPLEXES SHOWING UNUSUAL REVERSIBLE OXIDATION-REDUCTION BEHAVIOR WITH DIOXYGEN

1983 ◽  
Vol 14 (34) ◽  
Author(s):  
N. HERRON ◽  
W. P. SCHAMMEL ◽  
S. C. JACKELS ◽  
J. J. GRZYBOWSKI ◽  
L. L. ZIMMER ◽  
...  
Keyword(s):  
Reduction Behavior ◽  
Oxidation Reduction ◽  
Dinuclear Iron

scholarly journals Fabrication and characterization of printed zinc batteries

2021 ◽  
Vol 10 (3) ◽  
pp. 1173-1182
Author(s):  
M. A. Nazri ◽  
Anis Nurashikin Nordin ◽  
L. M. Lim ◽  
M. Y. Tura Ali ◽  
Muhammad Irsyad Suhaimi ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Lithium Ion ◽  
Current Collector ◽  
Polyvinyl Butyral ◽  
X Ray Diffraction ◽  
Nickel Zinc ◽  
Fabrication And Characterization ◽  
Screen Printing Technology ◽  
Better Than

Zinc batteries are a more sustainable alternative to lithium-ion batteries due to its components being highly recyclable. With the improvements in the screen printing technology, high quality devices can be printed with at high throughput and precision at a lower cost compared to those manufactured using lithographic techniques. In this paper we describe the fabrication and characterization of printed zinc batteries. Different binder materials such as polyvinyl pyrrolidone (PVP) and polyvinyl butyral (PVB), were used to fabricate the electrodes. The electrodes were first evaluated using three-electrode cyclic voltammetry, x-ray diffraction (XRD), and scanning electron microscopy before being fully assembled and tested using charge-discharge test and two-electrode cyclic voltammetry. The results show that the printed ZnO electrode with PVB as binder performed better than PVP-based ZnO. The XRD data prove that the electro-active materials were successfully transferred to the sample. However, based on the evaluation, the results show that the cathode electrode was dominated by the silver instead of Ni(OH)2, which leads the sample to behave like a silver-zinc battery instead of a nickel-zinc battery. Nevertheless, the printed zinc battery electrodes were successfully evaluated, and more current collector materials for cathode should be explored for printed nickel-zinc batteries.

scholarly journals Electrochemical reduction of artemisinin: Chromatographic identification of bulk electrolysis products

2019 ◽  
Vol 9 (3) ◽  
pp. 165-174 ◽  
Author(s):  
Faraja Ombwayo ◽  
Zahilis Mazzhichette ◽  
Amos Mugweru
Keyword(s):  
Cyclic Voltammetry ◽  
Sesquiterpene Lactone ◽  
Electrode Surface ◽  
Reference Electrode ◽  
Carbon Electrode ◽  
Naturally Occurring ◽  
Bulk Electrolysis ◽  
Electrolysis Products ◽  
Peroxide Bond ◽  
Prominent Peak

Artemisinin is a naturally occurring sesquiterpene lactone with an endo-peroxide bond. This drug is used for treatment of many diseases including malaria. The reduction of this molecule on an electrode surface was carried out by cyclic voltammetry as well as amperometry. Cyclic voltammetry of artemisinin generated one prominent peak wave at -1.0 V and another, smaller one at -0.3 V vs Ag/AgCl reference electrode. The bulk electrolysis of artemisinin on a carbon electrode generated two other irreversible peak waves at around -0.7 and -0.1 V. The concentration of the products was dependent on the time of electrolysis. LC-MS was used to determine the bulk electrolysis products of artemisinin. Initially dihydroartemisinin was generated as the main reduction product. Other reduction products were formed after further reduction of dyhidroartemisinin.

scholarly journals Electrochromic Self-Electrostabilized Polypyrrole Films Doped with Surfactant and Azo Dye

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1757 ◽  
Author(s):  
Bayat ◽  
Izadan ◽  
Molina ◽  
Sánchez ◽  
Santiago ◽  
...  
Keyword(s):  
Sodium Dodecyl ◽  
Polymerization Reaction ◽  
X Ray Diffraction ◽  
Step Potential ◽  
Polypyrrole Films ◽  
Oxidation Reduction ◽  
Redox Capacity ◽  
Pyrrole Monomer ◽  
Red Color ◽  
Sds Surfactant

Two azo dyes, acid red 1 (AR1) and acid red 18 (AR18), were used alone or in combination with sodium dodecyl sulfate (SDS) for the electropolymerization of a pyrrole monomer. Polypyrrole (PPy) showed higher redox capacity when SDS and AR18 were used simultaneously as dopant agents (PPy/AR18-SDS) than when the conducting polymer was produced in the presence of SDS, AR18, AR1, or an AR1/SDS mixture. Moreover, PPy/AR18-SDS is a self-stabilizing material that exhibits increasing electrochemical activity with the number of oxidation–reduction cycles. A mechanism supported by scanning electron microscopy and X-ray diffraction structural observations was proposed to explain the synergy between the SDS surfactant and the AR18 dye. On the other hand, the Bordeaux red color of PPy/AR18-SDS, which exhibits an optical band gap of 1.9 eV, rapidly changed to orange-yellow and blue colors when films were reduced and oxidized, respectively, by applying linear or step potential ramps. Overall, the results indicate that the synergistic utilization of AR18 and SDS as dopant agents in the same polymerization reaction is a very successful and advantageous strategy for the preparation of PPy films with cutting-edge electrochemical and electrochromic properties.

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