The role of ionic transference in polymer-modified electrodes

Doblhofer, Karl; Braun, Helga; Lange, Rainer

doi:10.1016/0022-0728(86)90259-7

Cited by 44 publications

(13 citation statements)

References 15 publications

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“…In the P(VP-St) matrix, besides the hydrophobic interaction of the complex with the polymer, the coordination of the porphyrin with the pendant pyridine group might be another factor affecting its activity [37][38][39][40][41]. Such coordination should be weak, since most pyridine groups are protonated at pH 1.2, but it cannot be neglected.…”

Section: Discussionmentioning

confidence: 96%

“…In our previous reports the electron transfer in the ) and reduction of methylviologen (MV 2 /MV Á ) in Nafion was studied [27,28,41,42]. The electron transfer in the reduction of MV 2 to MV Á occurred by a physical diffusion mechanism, although the redox species are incorporated into the Nafion by a rather strong electrostatic interaction.…”

Section: Discussionmentioning

confidence: 97%

“…Nafion is a sulfonated perfluoroalkyl polyanion known to be thermally stable, mechanically strong as well as chemically and biologically inert, and has been used extensively in various studies of electron transfer [33][34][35][36]. Poly(4-vinylpyridine-co-styrene), a cationic polymer at low pH, maintains electrochemical stability [37][38][39][40][41]. These two kinds of polymer were chosen as polymer supports in the present research.…”

Section: Introductionmentioning

confidence: 98%

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Electron Transfer in the Reduction of Cobalt Porphyrin Incorporated into Nafion and Poly(4-vinylpyridine-co-styrene) Films

Zhao

Zhang

Abe

et al. 1999

J. Porphyrins Phthalocyanines

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Potential step chronoamperospectrometry (PSCAS) measurement was carried out to investigate the one-electron transfer in the reduction of tetraphenylporphyrin cobalt(III) ([ Co III TPP (−2)]+) incorporated into a Nafion or poly(4-vinylpyridine-co-styrene) (P(VP-St)) film coated on an ITO electrode. The electron transfer of the redox centers in the two systems occurred by a physical diffusion mechanism. The fraction of the electroactive complex (R ct ) was independent of the CoTPP concentration in P(VP-St) but decreased with increasing CoTPP concentration in Nafion, especially at high concentrations. In both systems the apparent diffusion coefficient Dapp decreased with increasing CoTPP concentration. The Dapp value in Nafion (1.6 × 10−8 cm 2 s −1 at 0.02 M) was much higher than that in P(VP-St) (1.1 × 10−10 cm 2 s −1 at 0.02 M). The difference in the electron transfer process in the two systems was ascribed to the interaction of the redox center with the polymer framework, the morphology of the polymer matrix, the localization of the redox species in the hydrophilic/hydrophobic region, and the counterion migration under the potential step.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

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Electron Transfer in the Reduction of Cobalt Porphyrin Incorporated into Nafion and Poly(4-vinylpyridine-co-styrene) Films

Zhao

Zhang

Abe

et al. 1999

J. Porphyrins Phthalocyanines

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“…[20] Poly(4-vinylpyridine) (P4VP) is an important functional polymer and its pyridine ring bearing a tertiary nitrogen atom endows this polymer with distinct features. P4VP quaternized with organic bromides has been employed as a polyelectrolyte bearing polycations; [21][22][23][24] the crosslinked P4VP can be used as electrode material [25][26][27] and chromatographic packing material (e.g., as the stationary phase). [28] Generally speaking, crosslinked P4VP can be prepared via copolymerization of 4-vinylpyridine with compounds containing two vinyl groups (e.g., divinylbenzene) [29] or via the quaternization of P4VP with dihalides.…”

Section: Introductionmentioning

confidence: 99%

Poly(4‐vinylpyridine) Nanocrosslinked by Polyhedral Oligomeric Silsesquioxane

Liu

Meng

Zheng

2005

Macromol. Rapid Commun.

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Summary: Octa(propylglycidyl ether) polyhedral oligomeric silsesquioxane (OpePOSS) was used as the crosslinking agent to prepare the nanocrosslinked poly(4‐vinylpyridine) (P4VP) with POSS content up to 55.2 wt.‐%. The formation of the crosslinked structure is ascribed to the macromolecular reaction between pyridine rings of P4VP and epoxide groups of OpePOSS. The POSS‐crosslinked P4VP displayed enhanced glass transition temperatures (Tgs) and an improved thermal stability in terms of the results of thermal analysis.Crosslinking of poly(4‐vinylpyridine) with octa(propylglycidyl ether) polyhedral oligomeric silsesquioxane.magnified imageCrosslinking of poly(4‐vinylpyridine) with octa(propylglycidyl ether) polyhedral oligomeric silsesquioxane.

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“…One of the most often studied anion-exchange polymers is poly(4-vinylpyridine) (PVP) [8][9][10]. The use of PVP, however, presents some problems such as nonideal perselectivity [10,11], the need of chemical cross-linking to stabilize the polymer coating [12] and a fairly acidic solution environment is often necessary [13].…”

Section: Introductionmentioning

confidence: 99%

Anodic Stripping Voltammetric Determination of Thallium(III) Using a Tosflex/Mercury Film Electrode

Sun

1998

Electroanalysis

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A Tosflex/mercury film electrode (TMFE) was prepared by spin-coating a solution of the perfluorinated anion exchange polymer Tosflex onto a glassy carbon electrode surface followed by electrodeposition of a mercury film on this electrode. This electrode was used for the determination of trace thallium(III) which was preconcentrated onto the TMFE as the [TlCl 4 ] ¹ anion in a chloride medium by the anion-exchange feature of Tosflex and then determined by anodic square-wave stripping voltammetry (SWSV). Various parameters influencing the determination of thallium(III) were examined in detail. With 1 min accumulation, the analytical signal versus concentration dependence was linear from 0 to 80 ppb, and the detection limit was 0.1 ppb. The modified electrode showed good resistance to interferences from surface-active compounds and common ions. For repetitive use, the TMFE surface could be easily regenerated by setting the electrode potential at ¹0.4 V for 30 s.

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The role of ionic transference in polymer-modified electrodes

Cited by 44 publications

References 15 publications

Electron Transfer in the Reduction of Cobalt Porphyrin Incorporated into Nafion and Poly(4-vinylpyridine-co-styrene) Films

Electron Transfer in the Reduction of Cobalt Porphyrin Incorporated into Nafion and Poly(4-vinylpyridine-co-styrene) Films

Poly(4‐vinylpyridine) Nanocrosslinked by Polyhedral Oligomeric Silsesquioxane

Anodic Stripping Voltammetric Determination of Thallium(III) Using a Tosflex/Mercury Film Electrode

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