Influence of counter-ions on the permeability of polypyrrole films to hydrogen

Holzhauser, Petr; Bouzek, Karel

doi:10.1007/s10800-006-9132-0

Cited by 17 publications

(21 citation statements)

References 28 publications

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“…The PPy(SO 4 2) ) film exhibited the lowest permeability. At the same time its density was the highest of all the samples studied [12]. This can be explained by the fact that a sulphate anion is a relatively small, divalent ion.…”

Section: Cp Film Permeability For Hydrogenmentioning

confidence: 75%

“…It is based on the study of H 2 oxidation kinetics on the surface of a Pt RDE covered by a CP film of known thickness. A description of the method was given previously [12]. Only the main principles and resulting equations are presented here.…”

Section: Cp Film Permeability For Hydrogenmentioning

confidence: 99%

“…The thickness of the film was controlled by the charge passed during electropolymerization. A charge of 100 mC cm )2 was considered to correspond to the film thickness of 0.19-0.30 lm, depending on the counter-ion [12]. For the electrocatalytic activity study the PPy films synthesized on the top of GC RDE were modified by Pt particles deposited from 1 mM solution of K 2 [PtCl 4 ] in 0.5 M H 2 SO 4 by potentiostatic reduction at )45 mV.…”

Section: Determination Of the Electrocatalytic Activitymentioning

confidence: 99%

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Utilization of Nafion®/conducting polymer composite in the PEM type fuel cells

et al. 2006

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The present study focuses on the problem of using conducting polymers (CPs) in proton exchange membrane fuel cell technology. It covers the electrocatalytic properties of the CP/Pt composite, permeability of the CP film for H 2 , fixation of the compact CP film on the top of the Nafion Ò membrane and first results of its utilization in a fuel cell. The present results did not confirm a previously reported increase in CP/Pt composite electrocatalytic activity when compared to the commercially available carbon supported catalysts. The main reason seems to be the very low permeability of the compact CP film for the fuel. This may be an advantage with respect to the minimization of fuel cross-over, which is a serious problem in the direct methanol fuel cell. On the other hand, it represents a serious danger in water management of the fuel cell. This fact has been recognized and alternative solutions are presented.

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Section: Cp Film Permeability For Hydrogenmentioning

confidence: 75%

Section: Cp Film Permeability For Hydrogenmentioning

confidence: 99%

Section: Determination Of the Electrocatalytic Activitymentioning

confidence: 99%

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Utilization of Nafion®/conducting polymer composite in the PEM type fuel cells

et al. 2006

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“…The thickness of the PPyÀPSS films was calculated as 120 nm using a volume-to-charge ratio of 3.00 Â 10 À4 cm 3 /C. 39 The copper-based micro/nanostructures were formed electrochemically on the surface of the PPyÀPSS films. 37 After the electropolymerization, the electrodes were thoroughly rinsed with Milli-Q water and immersed in 0.10 M CuSO 4 aerated or oxygensaturated solution.…”

Section: ' Introductionmentioning

confidence: 99%

Electrochemical Fabrication of Copper-Based Hybrid Microstructures and Mechanism of Formation of Related Hierarchical Structures on Polypyrrole Films

et al. 2011

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The surface electrochemistry of polypyrroleÀ polystyrene sulfonate (PPyÀPSS) thin films is exploited for the fabrication of novel hybrid copper-based microstructures. The electrochemical deposition of the copper-based materials at the PPyÀPSS film is strongly dependent on the electrode potential. This dependence is studied at three different potentials: 0.10, 0.00, and À0.10 V vs SCE. Hierarchical micro/nanostructures made of copper hydroxysulfate salts are only formed at 0.10 V vs SCE and are replaced with branched and single microcrystals of Cu 2 O covered by a thin layer of Cu(OH) 2 at 0.00 and À0.10 V vs SCE, respectively. The different structures can be coupled on the same film through a simple fabrication procedure to give hybrid microstructures. These novel hybrids consist of a central microcrystal (deposited at À0.10 V vs SCE) and a surrounding contour of welded nanosheets (deposited at 0.10 V vs SCE). The mechanism of nucleation and growth of the hierarchical micro/ nanostructures formed at 0.10 V vs SCE is also reported. These structures are made from the assembly of nanoparticles into nanowires, nanosheets, and microclusters. These microclusters have a flowerlike shape within which each nanosheet forms a petal of the flower. The nucleation of the clusters is shown to be progressive.

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“…Porphyrins are of primary interest in molecular electronics due to their rich electronic/photonic properties (including charge transport, energy transfer, light absorption or emission) [7]. The relatively easy synthesis and purification of substituted tetraphenyl porphyrins (H 2 T(S)PP) make them very attractive for synthesize and preparation of systems applicable in diverse technological areas.…”

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confidence: 99%

Nylon/Porphyrin/Graphene Oxide Fiber Ternary Composite, Synthesis and Characterization

García‐Pérez¹,

Menchaca‐Campos²,

García-Sánchez³

et al. 2017

OJCM

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This research was based on the manufacture of new composite materials that offer technological possibilities in the development of new devices with greater efficiency. Electrospinning was used to form nylon 66/-tetra-(para-aminophenyl) porphyrin (H 2 T(p-NH 2 )PP)/graphene oxide (GO) composite film. Graphene oxide coatings were obtained from graphite, through mechanical exfoliation followed by calcination and ultrasonic agitation in an oxidant solution. These samples were characterized under SEM, FTIR, Raman spectroscopy, UV-vis and R-X techniques.

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Influence of counter-ions on the permeability of polypyrrole films to hydrogen

Cited by 17 publications

References 28 publications

Utilization of Nafion®/conducting polymer composite in the PEM type fuel cells

Utilization of Nafion®/conducting polymer composite in the PEM type fuel cells

Electrochemical Fabrication of Copper-Based Hybrid Microstructures and Mechanism of Formation of Related Hierarchical Structures on Polypyrrole Films

Nylon/Porphyrin/Graphene Oxide Fiber Ternary Composite, Synthesis and Characterization

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