Thermodynamic equilibrium study of phosphorus pentoxide-water binary system: The stability and solubility of 10H3PO4.H2O

Bakher, Z.; Kaddami, Mohammed

doi:10.1016/j.calphad.2018.09.006

Cited by 5 publications

(1 citation statement)

References 23 publications

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“…In addition to the protolysis equilibria, hydrolysis and condensation equilibria are the typical reactions in bulk H2SO4 (ortho-phosphoric acid), which lead to the formation of dimer, di-phosphoric acid H4P2O7 (pyro-phosphoric acid), and higher oligomers as triphosphoric acid H5P3O10, tetra-phosphoric acid H6P4O13, penta-phosphoric acid H7P5O16, etc. and aqueous species as H2O and H3O + [14]. The different polyacids, which coexist with an ____________________________________________________________________________ 2021 / 25 469 increasing polymerization degree by temperature rise, ultimately lead to complex equilibria.…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity and Water Effects in Phosphoric Acid Solutions for Doping of Membranes in Polymer Electrolyte Fuel Cells

Giffin

Conti

Korte

2021

Environmental and Climate Technologies

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Fuel cells (FCs) are among the more efficient solutions to limit the emission of greenhouse gases. Based on the conversion of the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) into electrical energy, a typical FC produces a voltage of 0.7 V under load. The potential is highly increased by placing the cells in series to obtain a stacked cell. Among the types of FCs, the polymer electrolyte membrane FCs (PEMFCs) are developed mainly for transport applications, because of their low impact on the environment, high power density and light weight compared with other types of FCs. Phosphoric acid (H3PO4) doped polybenzimidazole (PBI) membranes are widely used as efficient electrolytes. The performance of a (high temperature, 130–200 °C) HT-PEMFC depends mainly on the amount of H3PO4 in the solid polymer membrane. The strong autoprotolysis of H3PO4 is responsible for the high proton conductivity also in the anhydrous state. In this study, the H2OH3PO4 system is investigated in the temperature range 60–150 °C with varying water vapour activity at constant atmospheric pressure. Main purpose is to gain more insights into the kinetics of the equilibria in the H2O-H3PO4 system, which influence the fuel cell performance. Density, water content, electrical conductivity and activation energy are determined by exposing H3PO4 solutions for sufficiently long periods to controlled gas atmosphere in order to reach near-equilibrium conditions. The coexistence of ortho- and pyrophosphoric acid is analysed and higher condensed species are also considered. A new setup fully made in quartz is designed and developed to mix the phosphoric acid solutions in a climate chamber. The experimental results are compared to literature data to validate the developed setup and the methodology.

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Section: Introductionmentioning

confidence: 99%

Electrical Conductivity and Water Effects in Phosphoric Acid Solutions for Doping of Membranes in Polymer Electrolyte Fuel Cells

Giffin

Conti

Korte

2021

Environmental and Climate Technologies

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Solubility and thermodynamic modeling of calcium sulfate dihydrate in three organic aqueous solutions (ethylene glycol, acetic acid, dimethyl sulfoxide) from 303.15 K to 348.15 K

Wang

Miao

et al. 2022

The Journal of Chemical Thermodynamics

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Measurement and modeling correlation of capecitabine solubility in n-hexane + ethyl acetate and n-heptane + ethyl acetate at various temperatures

Zhao

Wan

Zhang

et al. 2019

Journal of Molecular Liquids

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Thermodynamic equilibrium study of phosphorus pentoxide-water binary system: The stability and solubility of 10H3PO4.H2O

Cited by 5 publications

References 23 publications

Electrical Conductivity and Water Effects in Phosphoric Acid Solutions for Doping of Membranes in Polymer Electrolyte Fuel Cells

Electrical Conductivity and Water Effects in Phosphoric Acid Solutions for Doping of Membranes in Polymer Electrolyte Fuel Cells

Solubility and thermodynamic modeling of calcium sulfate dihydrate in three organic aqueous solutions (ethylene glycol, acetic acid, dimethyl sulfoxide) from 303.15 K to 348.15 K

Measurement and modeling correlation of capecitabine solubility in n-hexane + ethyl acetate and n-heptane + ethyl acetate at various temperatures

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Thermodynamic equilibrium study of phosphorus pentoxide-water binary system: The stability and solubility of 10H3PO4.H2O

Cited by 5 publications

References 23 publications

Electrical Conductivity and Water Effects in Phosphoric Acid Solutions for Doping of Membranes in Polymer Electrolyte Fuel Cells

Electrical Conductivity and Water Effects in Phosphoric Acid Solutions for Doping of Membranes in Polymer Electrolyte Fuel Cells

Solubility and thermodynamic modeling of calcium sulfate dihydrate in three organic aqueous solutions (ethylene glycol, acetic acid, dimethyl sulfoxide) from 303.15 K to 348.15 K

Measurement and modeling correlation of capecitabine solubility in n-hexane + ethyl acetate and n-heptane + ethyl acetate at various temperatures

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Measurement and modeling correlation of capecitabine solubility in n-hexane + ethyl acetate and n-heptane + ethyl acetate at various temperatures