Surfactant effect on the conductivity behavior of CsH2PO4: Characterization by electrochemical impedance spectroscopy

Hosseini, Soraya; Homaiee, M.; Mohamad, Abu Bakar; Malekbala, Mohamad Rasool; Khadum, A.A.H.

doi:10.1016/j.physb.2011.01.040

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Typical impedance spectra were obtained below superprotonic phase (210°C), at superprotonic phase (230°C) and above superprotonic phase (260°C). Good agreement was observed between the experimental and the equivalent circuits (using Zview2) (Hosseini et al 2011). The relative error between the experimental and calculated spectra is less than 3%.…”

Section: Is and Ftir Analysissupporting

confidence: 53%

Effect of surfactants in synthesis of CsH2PO4 as protonic conductive membrane

et al. 2011

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Cesium dihydrogen phosphate (CDP) powders were synthesized by cetyltrimethylammoniumbromide (CTAB), polyoxyethylene-polyoxypropylene (F-68) and mixture of both surfactants F-68 : CTAB with two molar ratios 0⋅06 and 0⋅12 as surfactant solutions at room temperature. The synthesized CsH 2 PO 4 is characterized by ICP, XRD, TEM, SEM, FT-IR, BET and IS techniques. Based on the width of the (011) XRD diffraction peak and BET measurement, the average size of nanoparticles was ~ 10 nm in diameter, while the TEM images indicate smaller size than both techniques. The analysis reveals existence of P and Cs with mole ratio 1⋅02 ± 0⋅03 which is compatible to molar ratio CsH 2 PO 4 formula. The experimental results show that the conductivities increase in the order of CDP CTAB > CDP (F-68 : CTAB)0.12 > CDP (F-68:CTAB)0.06 > CDP F-68 . The sequence of increasing conductivity is in accordance with the ion exchange capacities of the samples that has direct proportional effect on the proton mobility of samples. Indeed CTAB as cationic surfactant shows the highest proton mobility in the as-obtained samples.

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Section: Is and Ftir Analysissupporting

confidence: 53%

Effect of surfactants in synthesis of CsH2PO4 as protonic conductive membrane

et al. 2011

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“…The dehydration can be avoided by keeping CDP either under a saturated water vapor atmosphere or under high pressure (~1 GPa) [4][5][6], but these methods are not well-suited for large-scale fuel cell applications. Several alternative approaches, including the use of SiO 2 -based composites [12][13][14][15][16], mixed cation compounds [17][18][19], and nanoparticle with different surfactants [20] have been proposed and have led to the enhancement of CDP's superprotonic phase conductivity and stability. Yet, its dehydration could not be completely inhibited in the absence of high pressures or a saturated water vapor atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Stability of Superprotonic CsH2PO4 Hermetically Sealed in Different Environments

2022

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Using powder X-ray diffraction and AC impedance spectroscopy, we have found that the superprotonic CsH2PO4 (CDP) phase is stable at T = 250 °C when sealed in different volumes (15 mL and 50 mL) of dry air or inert gasses. Under these conditions, CDP’s proton conductivity stays constant at 2.5 × 10−2 S·cm−1 for at least 10 h. On the other hand, removing the gas from the chamber leads to a sharp, two-order-of-magnitude drop in the proton conductivity. Our data show no evidence of a self-generated water vapor atmosphere in the chamber, and the gas pressure at T = 250 °C is several orders of magnitude below the pressures previously used to stabilize CDP’s superprotonic phase. These results demonstrate that hermetically sealing CDP in small gas-filled volumes represents a new method to stabilize the superprotonic phase, which opens new paths for large-scale applications of phosphate-based solid acids as fuel cell electrolytes.

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Vapor pressure and specific electrical conductivity in the solid and molten H2O-CsH2PO4-CsPO3 system—a novel electrolyte for water electrolysis at ~ 225–400 °C

Nikiforov

Berg

Bjerrum

2018

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Surfactant effect on the conductivity behavior of CsH2PO4: Characterization by electrochemical impedance spectroscopy

Cited by 5 publications

References 34 publications

Effect of surfactants in synthesis of CsH2PO4 as protonic conductive membrane

Effect of surfactants in synthesis of CsH2PO4 as protonic conductive membrane

Stability of Superprotonic CsH2PO4 Hermetically Sealed in Different Environments

Vapor pressure and specific electrical conductivity in the solid and molten H2O-CsH2PO4-CsPO3 system—a novel electrolyte for water electrolysis at ~ 225–400 °C

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