Preparation and physical properties of (PVA)0.7(NaBr)0.3(H3PO4)M solid acid membrane for phosphoric acid – Fuel cells

Ahmad, F.; Sheha, E.

doi:10.1016/j.jare.2012.05.001

Cited by 55 publications

(17 citation statements)

References 39 publications

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“…Generally, according to Debye relations, the decrease of ' and " with frequency can be associated to the inability of dipoles to rotate rapidly leading to a lag between frequency of oscillating dipole and that of the applied field. While, the material electrode interface polarization of the composites masks the other relaxation processes at low frequencies [17][18].…”

Section: = Nqµmentioning

confidence: 99%

Non-aqueous liquid electrolyte based magnesium perchlorate/dimethyl sulfoxide for rechargeable magnesium battery

Sheha

2017

The Arab Journal of Scientific Research

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Non aqueous liquid electrolyte system based dimethyl sulfoxide, tetraethylene glycol dimethyl ether (DMTG) and magnesium perchlorate (Mg(ClO 4 ) 2 ) is synthesized via 'Solvent-in-Salt' method for the application in magnesium battery. Impedance spectroscopy, dielectric properties, and ion transport were used to characterize the nature of conduction process. The conductivity conformation with the addition of (Mg(ClO 4 ) 2 ) can be explained on the basis of dissociation of ion aggregates formed in electrolytes at higher concentrations of the salt. The ionic conductivity of the electrolyte increased with addition of salt reached to the highest conductivity value of ≈ 10 -3 S.cm -1 at 0.22 M Mg(ClO 4 ) 2 . The frequency dependence of AC conductivity obeys special power law. The estimated value of Mg +2 ion transference number is found to be 0.68 for high conducting film. A prototype cell was constructed using the non-aqueous liquid electrolyte with Mg anode and TiO 2 cathode. The Mg/ TiO 2 cell shows promising cycling. The discharge characteristics are found to be satisfactory as a laboratory cell. Mg intercalation into TiO 2 was confirmed by energy dispersive X-ray spectroscopy (EDS).

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Section: = Nqµmentioning

confidence: 99%

Non-aqueous liquid electrolyte based magnesium perchlorate/dimethyl sulfoxide for rechargeable magnesium battery

Sheha

2017

The Arab Journal of Scientific Research

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“…Another applications of phosphoric acid include the treatment of surface of metals (Section 10.8), the utilization in dentistry [28], [29], [30], [31], [37], [38] (described in Section 10.1.2), phosphate binders [32], geopolymers [33], phosphoric acid fuel cells [34], [35], [36], gel-based electrolytes [39] and solid membranes [40], [41], [42] for fuel cells, the activation of carbon adsorbents [43], [44] and catalysts [45], [46], the modification of zeolites [47], catalytic decomposition of H 2 O 2 [48] and organic syntheses, e.g. esterification [49], [50].…”

Section: Properties Of Phosphoric Acidmentioning

confidence: 99%

Utilization of Apatite Ores

Ptáček¹

2016

Apatites and Their Synthetic Analogues - Synthesis, Structure, Properties and Applications

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Phosphate rock is an important mineral commodity used in the chemical industry and production of food. The first section of ninth chapter of this book introduces utilization of apatite ores for manufacturing of phosphorus. The second part deals with production of phosphoric acid via wet and thermal process and utilization of byproducts such as phosphogypsum, phosphorous slag and ferrophosphorus. The last section of this chapter describes the methods for production of fertilizers, such as supephosphates, Thomas slag, ammonium phosphates, thermophosphates, etc., and the chapter ends with environmental demand of phosphate fertilizers.

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“…A commonly used proton exchange membrane is Nafion, which is a perfluoro sulfonic acid polymer. The use of Nafion is based on its good thermal and chemical stability [4] and high ionic conductivity (~10 −2 S.cm −1 ) at temperatures below 100°C [2]. However, the membrane has several disadvantages, such as high cost; high methanol crossover, which makes it incompatible for application in a methanol fuel cell; and environmental unfriendliness, as wastes are generated in its synthesis process [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Chitosan-Polyvinyl Alcohol-Fe2O3 Composite Membrane for DMFC Application

2020

Makara J.Sci

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This study investigates the utilization of different compositions of Fe 2 O 3 and polyvinyl alcohol (PVA) to modify chitosan in order to prepare a composite membrane. The membranes were synthesized using the phase inversion method and extensively characterized by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), mechanical properties analysis, and water uptake analysis, whereby SEM was used to confirm the morphology of the composite membranes. Different electrochemical properties such as ion exchange capacity, proton conductivity, and methanol permeability of these membranes were also measured. The results showed that increasing the PVA mass improved the water uptake, ion exchange capacity (IEC), and proton conductivity because the PVA addition increased the hydrophilicity of the membrane; thus, the pore surface on the membrane was more open, which also caused higher membrane permeability. However, the methanol permeability values of all composite membranes were lower than that of Nafion. The highest IEC and proton conductivity were obtained for the CS-PVA-H3070 membrane, with values of 4.300 meq/g and 6.71 × 10 −2 S•cm −1 , respectively. The mechanical strength of these membranes showed that the PVA addition increased the elongation break and decreased the tensile strength of the membrane. The results imply that the chitosan membrane modified with PVA and Fe¬ 2 O 3 has a potential for DMFC applications.

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Preparation and physical properties of (PVA)0.7(NaBr)0.3(H3PO4)M solid acid membrane for phosphoric acid – Fuel cells

Cited by 55 publications

References 39 publications

Non-aqueous liquid electrolyte based magnesium perchlorate/dimethyl sulfoxide for rechargeable magnesium battery

Non-aqueous liquid electrolyte based magnesium perchlorate/dimethyl sulfoxide for rechargeable magnesium battery

Utilization of Apatite Ores

Synthesis and Characterization of Chitosan-Polyvinyl Alcohol-Fe2O3 Composite Membrane for DMFC Application

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