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Co-polypyrrole

Fig. 2 UV-Vis spectra of monomers EDOT and pyrrole, and polymers PEDOT, polypyrrole and PEDOT-co-polypyrrole. (Reprinted with permission from Bruno et al. [37]. 2006, American Chemical Society)... Fig. 2 UV-Vis spectra of monomers EDOT and pyrrole, and polymers PEDOT, polypyrrole and PEDOT-co-polypyrrole. (Reprinted with permission from Bruno et al. [37]. 2006, American Chemical Society)...
Co-polypyrrole complex polypyrrole modification, deposited on carbon [13]... [Pg.180]

Through examples of new catalyst of this class could be mentioned polymeric complexes such as Co-polypyrrole complex [13], Mn-polypyrol-phthalocyanine complex [14], Co(II)-tetrasulphophtalophthalocyanine complex [17]. Active center of this catalyst is the metal ion encircled with nitrogen atoms. The structure of Mn-polypyrol-phthalocyanine complex (MnTPhPyrPc) is showed in Fig. 2. [Pg.180]

Co-polypyrrole-carbon. However, none of these have matched the catalytic performance of Pt. [Pg.346]

Zelenay et al. explored Co-polypyrrole (CoPPy) material as a PEM fuel-cell cathode catalyst. The composite CoPPy catalyst, even without a heat treatment, could generate a power density of 0.15Wcm in a H2—O2 fuel cell and displayed no signs of performance degradation for more than 100 h. Their results showed that heteroatomic polymers can be used not only to stabilize the non-noble metals in a PEM fuel cell environment but also to generate active sites for the ORR. Study of the interaction between the catalyst and oxygen also demonstrated that CoPPy... [Pg.98]

Entrapment of biochemically reactive molecules into conductive polymer substrates is being used to develop electrochemical biosensors (212). This has proven especially useful for the incorporation of enzymes that retain their specific chemical reactivity. Electropolymerization of pyrrole in an aqueous solution containing glucose oxidase (GO) leads to a polypyrrole in which the GO enzyme is co-deposited with the polymer. These polymer-entrapped GO electrodes have been used as glucose sensors. A direct relationship is seen between the electrode response and the glucose concentration in the solution which was analyzed with a typical measurement taking between 20 to 40 s. [Pg.45]

Otero and co-workers208,212 have visually observed nuclei of oxidized polymer in thin polypyrrole films on electrodes. They attribute these to sites of counter-ion and solvent ingress. A nucleation model based on the growth of ionically conductive zones provides good agreement with experimental chronoamperometric responses. [Pg.585]

In the area of ion sensing, cation recognition by electrodes containing functionalized redox-active polymers has been an area of considerable interest. Fabre and co-workers have reported the development of a boronate-functionalized polypyrrole as a fluoride anion-responsive electroactive polymer film. The electropolymerizable polypyrrole precursor (11) (Fig. 11) was synthesized by the hydroboration reaction of l-(phenylsulfonyl)-3-vinylpyrrole with diisopinocampheylborane followed by treatment with pinacol and the deprotection of the pyrrole ring.33 The same methodology was utilized for the production of several electropolymerizable aromatic compounds (of pyrrole (12) (Fig. 11), thiophene (13 and 14) (Fig. 11), and aniline) bearing boronic acid and boronate substituents as precursors of fluoride- and/or chloride-responsive conjugated polymer.34... [Pg.27]

The Teixidor team further improved upon this chemistry by covalently linking units of 109 to the polypyrrole monomer prior to electropolymerization.139 A [3,3 -Co(C2B<)H11)2] anion was covalently bound to a pyrrole via a spacer through one of its boron atoms by the reaction of the species [3,3 -Co(8-C4H802-l,2-C2B9H10)(r,2 -(C2B9H11)2] with potassium pyrrole, as functionalization through... [Pg.69]

Further studies by this group centered on comparisons of the overoxidation resistance limit (ORL) of polypyrrole materials doped with monoanionic borane clusters [B12H11NH3] or dianionic borane [B12H12]2 or carborane [Co(C2B9Hu)2]2-clusters. The monoanionic boron clusters were found to offer the highest stability to the PPy doped materials against overoxidation than any other charged dopant. They were also found to be far superior to the dianionic clusters in their ability to impart an ORL rise.140... [Pg.70]

The synthesis of the first covalently attached carborane-containing polypyrrole was reported by Fabre and co-workers.141 The initial step involved the production of... [Pg.70]

Furthermore, the utilization of preformed films of polypyrrole functionalized by suitable monomeric ruthenium complexes allows the circumvention of problems due to the moderate stability of these complexes to aerial oxidation when free in solution. A similar CO/HCOO-selectivity with regards to the substitution of the V-pyrrole-bpy ligand by an electron-with-drawing group is retained in those composite materials.98 The related osmium-based redox-active polymer [Os°(bpy)(CO)2] was prepared, and is also an excellent electrocatalyst for the reduction of C02 in aqueous media.99 However, the selectivity toward CO vs. HCOO- production is lower. [Pg.481]

Electron Transfer Type of Dehydrogenase Sensors To fabricate an enzyme sensor for fructose, we found that a molecular interface of polypyrrole was not sufficient to realize high sensitivity and stability. We thus incorporated mediators (ferricyanide and ferrocene) in the enzyme-interface for the effective and the most sensitive detection of fructose in two different ways (l) two step method first, a monolayer FDH was electrochemically adsorbed on the electrode surface by electrostatic interaction, then entrapment of mediator and electro-polymerization of pyrrole in thin membrane was simultaneously performed in a separate solution containing mediator and pyrrole, (2) one-step method co-immobilization of mediator and enzyme and polymerization of pyrrole was simultaneously done in a solution containing enzyme enzyme, mediator and pyrrole as illustrated in Fig.22. [Pg.350]

An electronic conductive polymer was found by Strike al. as a support for platinum with a co-catalysts. The platinum particles were deposited on electrodeposited polypyrrole. [Pg.194]

A polypyrrole film electrochemically deposited on gold electrodes from an MeCN-liCl04/Co(OAc)2 solution shows electrocatalytic activity in dioxygen reduction [404]. The catalytic electroreduction of dithio dipropionic acid (PSSP) with the water-soluhle cohalt(II I)tetrakis(4-trimethyl-ammonium phenyl) porphyrin (CoTMAP) has heen studied. The Co catalyst adsorbed on the glassy carbon electrode plays a major role in the electroreductive cleavage of the S—S bond [405]. [Pg.554]

Polypyrrol is a polymeric support that can be used in immobilization of ONDs to surfaces. The generation of polypyrrol films can be by electrochemical co-polymerization of pyrrole and pyrrole-modified ONDs onto platinum electrodes. The polymer forms a black and insoluble film that is electrically conducting and whose thickness depends on the current used during the polymerization process (Fig. 14). The final surface density of the OND can be controlled by the ratio of pyrrole/OND being polymerized [53-55]. [Pg.93]

Polypyrrole/poly(ethylene-co-vinyl acetate) conducting composites with improved mechanical properties were prepared by a similar method [167], In addition, polyaniline/polystyrene [168] and polyaniline/poly(alkyl methacrylate) [169] composites have been synthesised. A solution of persulphate in aqueous HC1 was added to an o/w HIPE of polymer and aniline in an organic solvent, dispersed in aqueous SDS solution, causing aniline polymerisation. Films were processed by hot- or cold-pressing. [Pg.205]


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See also in sourсe #XX -- [ Pg.98 ]




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