Electrotransportation of Aniline Through a Perfluorosulfonate Ion‐Exchange Membrane

Katakura, Katsumi; Inaba, Masaaki; Toyama, Kiyoshi; Ogumi, Zempachi; Takehara, Zen‐ichiro

doi:10.1149/1.2055012

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…Neutral aniline absorbs light at a wavelength of 280 nm. 40 The absorbance changes at 230 and 280 nm indicated that anilinium is the predominant species in the solution. Moreover, the pH values were measured in the source and receiver solutions to ensure that the proportion of neutral aniline and anilinium cation was kept constant during the experiment.…”

Section: Resultsmentioning

confidence: 99%

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Molecular-Sieving Capabilities of Mesoporous Carbon Membranes

et al. 2008

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The size-sieving properties of a mesoporous carbon membrane were studied via molecular permeation and cyclic voltammetry experiments. Two phenomena, simple diffusion and electrochemically aided diffusion, were investigated. Molecular diffusion through the membrane was caused by a concentration gradient across the membrane and was facilitated by electrosorption of ions under an externally applied electric field. The diffusion of molecules transported through the membrane was characterized by the values of permeability and apparent diffusion coefficient in the membrane. Because larger molecules are more restricted in terms of penetrating the pores, the size-based selectivity of the mesoporous carbon membrane could be readily observed. For example, in the two-component permeation experiment, a high selectivity (alpha=56.9) of anilinium over Rhodamine B was found. It is inferred that the diffusive transport of the larger Rhodamine B molecules with a more extensive retardation comes from the competitive mechanism between the two kinds of molecules in accessing the pore. A series of voltammetric experiments involving a mesoporous carbon membrane immersed in various electrolytes with ions of different sizes allowed the observation of ion-exclusion phenomena. It was found that the size effect is significant for electrochemically aided diffusion and electrosorption processes. The number of cations inside the pores of the membrane decreases with increasing cation size. This phenomenon is due to the size-exclusion effect, which could be demonstrated by the values of electrical double-layer capacitance for sodium, magnesium, and tetrahexylammonium cations, at potentials ranging from negative values to the point of zero charge, corresponding to 86.7, 73.1, and 50.0 F/g, respectively. The findings of this work manifest that the relationship between the pore size and the dimensions of the molecules determines the transport and sorption behavior of nanoporous carbon materials.

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Section: Resultsmentioning

confidence: 99%

“…The absorbance at a wavelength of 230 nm was used for measuring the anilinium concentration in the receiver solution. Neutral aniline absorbs light at a wavelength of 280 nm . The absorbance changes at 230 and 280 nm indicated that anilinium is the predominant species in the solution.…”

Section: Resultsmentioning

confidence: 99%

Molecular-Sieving Capabilities of Mesoporous Carbon Membranes

et al. 2008

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“…As can be seen in Figure 1, Huang reported that aniline can be adsorbed on the surface of Pt in the presence of hydrogen gas at 350K with parallel positioned aromatic benzene ring. Only a few studies on the diffusion of aniline through the perfluorosulfuric acid (PFSA) ion exchange membrane have been reported, although they have been studied with a sodium form of the membrane and not the proton form of the membrane 4,5 . Studies in which PANI film was synthesized by electrochemical potential cycling between 0.6 and 0.8 V (vs. DHE) was also reported.…”

Section: Introductionmentioning

confidence: 99%

Aniline as a Cationic and Aromatic Contaminant in PEMFCs

et al. 2010

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Aniline as a possible contaminant in polymer electrolyte membrane fuel cells (PEMFCs) has been studied by several ex-situ techniques. The aniline isotherm for MEA shows more affinity to ion-exchange with the PEM than other monovalent such as sodium and ammonium ions, thus indicating stronger performance loss at the same concentration. The results of cyclic voltammetry (CV) of Pt/C show the loss of electrochemical surface area (ECSA) by with the addition of aniline in the electrolyte. The appearance of unknown peaks in CV may indicate the production of polyaniline (PANI) film which appears to grow with the number of CV tests. These studies indicate that the use of balance of plant components that leach aniline should be avoided since its presence appears to decrease the electrochemical activity of the electrode for the oxygen reduction reaction. Further studies on aniline with in-situ experiment may not be warranted.

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“…The adsorption of anilinic compounds from solution onto both carbon and Pt has been reported 1,2,3 . Only few studies on the diffusion of aniline through the perfluorosulfonated ion exchange membrane have been reported though they are the study with a metal form and not proton form exchanger 4,5 . The behavior of aniline might be more complicated than ammonia as a contaminant on PEMFC since it has not only catalytic activity but also hydrophobic properties related to an aromatic benzene ring even though they are both cationic species.…”

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confidence: 99%