Effect of silica on the thermal behaviour and ionic conductivity of mixed salt solid acid composites

Mohammad, Norsyahida; Mohamad, Abu Bakar; Kadhum, Abdul Amir H.; Loh, Kee Shyuan

doi:10.1016/j.jallcom.2016.08.188

Cited by 23 publications

(10 citation statements)

References 18 publications

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“…When compared to the conductivity results of the literature, see e.g. [12], [40], [43]- [44], [47], [52], [69], [78], [112]- [114], [116], it can be seen that our results are grossly on the same order of magnitude. Limiting the discussion to the "superprotonic" part of the conductivity range ( Figure 10) we see that measurements above ∼300 °C are not available in prior literature and that the high conductivities that have been reported are leveling off.…”

Section: The Formal Composition Is Conveniently Given As the Molar Cosupporting

confidence: 73%

“…The CDP crystal also undergoes a proton ordering ferro-to para-electric phase transition at low temperature, at about -119 °С [17]- [23] that will not be considered here. The successful use of the CDP salt as a promising solid electrolyte was demonstrated in intermediate temperature fuel cells, sometimes with composite electrolyte membranes to stabilize the conductivity at temperatures up to ~250 °С [12], [21], [24]- [44]. Thus CDP seems to be one of the most widely studied solid acid electrolytes.…”

mentioning

confidence: 99%

“…Since this dehydration reaction occurs in parallel with the transition to the superprotonic phase, the nature of CDP phases and the conduction mechanism has been much discussed over the last decades [4], [9], [12], [19], [21]- [23], [26]- [27], [33], [35], [38], [44], [46]- [63]. The phase diagram in the CsH 2 PO 4 -CsPO 3 system was studied in e.g.…”

mentioning

confidence: 99%

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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

Ionics

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Section: The Formal Composition Is Conveniently Given As the Molar Cosupporting

confidence: 73%

mentioning

confidence: 99%

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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

Ionics

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“…Cesium dihydrogen phosphate (CDP), was synthesized by slow evaporation under ambient conditions from an aqueous solution of Cs 2 CO 3 (99%, Alfa Aesar) and phosphoric acid H 3 PO 4 (≥ 85 wt. % in H 2 O, Alfa Aesar) according to the following reaction [22]: Dissolve 25 gm Cs 2 CO 3 in 200 ml distilled water, 15 ml 98% H 3 PO 4 previously dissolve in 200 ml distilled water was added to the solution prepared above dropwise, using a burette. The total volume of the solution becomes 400 ml.…”

Section: Methodsmentioning

confidence: 99%

Structural, thermal and electrical properties of composites electrolytes (1−x) CsH2PO4/x ZrO2 (0 ≤ x ≤ 0.4) for fuel cell with advanced electrode

et al. 2021

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Composites proton conducting material based on cesium dihydrogen phosphate (CDP) doped with zirconium oxide (1−x) CsH2PO4/x ZrO2 were synthesized with different concentration having in the range such as x = 0.1, 0.2, 0.3 and 0.4 by ball milling method. The prepared solid acid composites were dried at 150 °C for 6 h. Structural and thermal characterization of solid acid composite proton electrolytes were carried out by X-ray diffractometer, Fourier transform infrared spectroscopy, and Raman spectroscopy respectively. Phase transition of the prepared materials was carried out by using differential scanning calorimetry and conductivity was measured by LC Impedance meter in the range 1 Hz to 400 kHz. The ionic conductivity of ZrO2 doped CsH2PO4 (CDP) was increased up to 1.3 × 10–2 S cm−1 at the 280 °C under environment atmospheric humidification which showed high stability as compared to pure CsH2PO4 (CDP). This obtaining result would be useful for establishing and design the next generation fuel cell.

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“…The optimised solid acid composite (CDP23) was characterised via several methods, including differential scanning calorimetry, thermogravimetric analysis and X-ray diffraction. The findings have been published elsewhere [13].…”

Section: Methodsmentioning

confidence: 84%

OPTIMISATION OF THE COMPOSITION AND PROCESS PARAMETER OF CsH2PO4/NaH2PO4/SiO2 SOLID ACID COMPOSITE VIA THE TAGUCHI METHOD

Mohammad

Mohamad²,

Kadhum³

et al. 2019

MJAS

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Solid acid composites of CsH 2 PO 4 /NaH 2 PO 4 /SiO 2 (CDP/SDP/SiO 2) were synthesised with varied SDP to CDP and SiO 2 to CDP mole fractions. The composites were arranged for optimisation via the Taguchi method with L9 orthogonal array, which manipulates four factors: the amount of SDP, amount of SiO 2 , amount of pressure used for pellet production and operating temperature. Responses were recorded as the averaged conductivity value for each experimental set. The composite powders were uniaxially pressed to form pellets of 1 mm thickness for conductivity measurements. Conductivity value was averaged from three readings and used in the signal-to-noise (S/N) ratio formula. The S/N ratio was set such that larger is better and calculated to maximise the response required for the analysis. Operating temperature has the largest effect on the conductivity value of solid acid composites, whereas the amount of SiO 2 has the smallest effect. The amount of SDP in the composite has a larger effect than the pressure applied during pellet production prior to the conductivity measurements. The optimised composite consists of 0.2 mole fraction of SDP to CDP and 0.3 mole fraction of SiO 2 to CDP pressed at 3 tonnes cm-2 to produce pellets and tested at the temperature of 250 °C. The optimisation was validated by using analysis of variance from the Design-Expert ® software.

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Effect of silica on the thermal behaviour and ionic conductivity of mixed salt solid acid composites

Cited by 23 publications

References 18 publications

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

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

Structural, thermal and electrical properties of composites electrolytes (1−x) CsH2PO4/x ZrO2 (0 ≤ x ≤ 0.4) for fuel cell with advanced electrode

OPTIMISATION OF THE COMPOSITION AND PROCESS PARAMETER OF CsH2PO4/NaH2PO4/SiO2 SOLID ACID COMPOSITE VIA THE TAGUCHI METHOD

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