Bulk and surface properties of ionic salt CsH5(PO4)2

Лаврова, Г. В.; Burgina, E. B.; Матвиенко, А. А.; Пономарева, В. Г.

doi:10.1016/j.ssi.2006.05.001

Cited by 43 publications

(36 citation statements)

References 14 publications

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“…The second is a broadened band shape observed in many IHCs [17,[35][36][37]57], SPCs [39,[70][71][72][73], β-alumina [40,41,74], Li-ion conductors [2,42], YSZ [43,59,60], and NdGaO 3 [75], and also rapid band broadening of the host lattice mode with increasing temperature observed in SICs [8][9][10][11]15,34,76]. Both the behaviors are typical evidence for the fourth-order anharmonicity.…”

Section: Significant Roles Of Vibration Modes and Of Specific Crystalmentioning

confidence: 95%

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Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

Wakamura

2009

Solid State Ionics

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Section: Significant Roles Of Vibration Modes and Of Specific Crystalmentioning

confidence: 95%

“…2, we show experimental points of mobile ion-type SICs, IHCs, defect-type O-ion conductors. The positions of plotted points are respectively near A-, B-, and C-curves [34][35][36][37][38][39][40][41][42][43]. Each proportional curve is empirically expressed as…”

Section: The Relationship Between E Ac and σ(M I / N) Valuesmentioning

confidence: 99%

Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

Wakamura

2009

Solid State Ionics

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“…As shown in Figure 6 (b), in the DSC curves of SPEEK and PSi/SPEEK membranes, the peaks at around 310°C were in accordance with decomposition of the PEEK main chain. For CsH5(PO4)2, a large endothermic peak appeared at 150°C, attributable to its melting [32,42]. The endothermic peak of (9Cs/1PSi)/SPEEK was noted at 143°C, which was lower than that of CsH5(PO4)2; this indicates a lower melting point than that of pure CsH5(PO4)2.…”

Section: Morphology Of the Composite Electrolyte Membranesmentioning

confidence: 91%

“…As shown in Figure 3, the infrared spectrum of CsH5(PO4)2 powder features broad absorption bands at  = 2800, 2348, and 1644 cm −1 , which indicate strongly hydrogen-bonded systems at the corresponding positions [31][32][33]. CsH5(PO4)2 has five robust hydrogen bonds per formula unit; while the fifth is shorter, four are nearly identical, such that the salt formula might be written as CsH(H2PO4)2 [32].…”

Section: Characterizationmentioning

confidence: 99%

A Flexible CsH₅(PO₄)₂-Doped Composite Electrolyte Membrane for Intermediate-Temperature Fuel Cells

Chen

Wen

et al. 2016

J. Electrochem. Soc.

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Based on CsH5(PO4)2, sulfonated poly(ether ether ketone) (SPEEK), and phosphosilicate sol, proton-conducting CsH5(PO4)2/phosphosilicate/SPEEK composite electrolyte membranes have been prepared by a sol-gel method followed by mechanical ball-milling. The chemical structures, morphologies, thermal performances, stability, and 2 proton conductivities of the composite electrolyte membranes were investigated. After incorporating the SPEEK polymer, these composite membranes exhibited adequate flexibility and mechanical performance; despite inorganic content of up to 80 wt%, a tensile strength of 6.2 MPa was maintained. Specifically, the composite electrolyte membrane displays a high proton conductivity of 14.6 mS cm -1 at 250°C under 47% H2O/N2 atmosphere. A fuel cell equipped with the composite electrolyte membrane showed a stable output voltage over the continuous measurement of 50 h under a constant output current density of 40 mA cm -2 .

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“…Crystallographically, five H sites, two P sites and one Cs site exist in CPDP structures 8 and strong hydrogen bonds in CPDP were observed to consist of 4 OHs with similar OH bond lengths, with the other OH having a shorter bond length. 9 Since stronger hydrogen bonding results in larger 1 H chemical shifts, the peak at 16.7 ppm in the 1 H MAS NMR spectrum is assigned to the H with the shortest OH bond length (the stronger hydrogen bonding), and the rest of the peaks at 12.9 and 11.5 ppm are assigned to the other 4 Hs. The These results suggest that 31 P MAS NMR experiments for solid acids are more advantageous without 1 H decoupling, especially at fast spinning rates over a few tens of kHz.…”

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confidence: 99%

Characterization of Solid Acid Electrolyte CsH₅(PO₄)₂by NMR Spectroscopy

Chae¹,

Lee²,

Han

et al. 2013

Bulletin of the Korean Chemical Society

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The electrolyte is one of the most important constituents of fuel cells (FCs), and determines the application areas, the performance, and the operation temperature range. The high proton conductivities of solid acids in specific temperature ranges have made them as excellent candidates for FC electrolytes.1 Solid acids are both an acid and salt in a solid state, and can generally be described as M a H b (XO 4 ) c , where M is Cs, Rb, K, Na, or NH 4 and X is P, S, As, or Se. Ever since CsHSO 4 (CHS) electrolyte was demonstrated for FCs by Halie et al.1 various solid acid electrolytes for FCs have been reported.2,3 Even better performance than that with CHS was reported with CsH 2 PO 4 (CDP) only, or with CDP/ Si-oxide composites in humidified conditions.2,3 All of the CDP in the CDP/SiP 2 O 7 composite electrolyte was observed by X-ray diffraction (XRD) to convert to CsH 5 (PO 4 ) 2 (CPDP) at 220°C and higher, indicating that the good conductivity of this composite electrolyte over 150-250°C was mainly from CPDP, not CDP. 3Solid acid electrolytes have been characterized primarily by XRD. However, solid-state nuclear magnetic resonance spectroscopy (SS-NMR) can be more powerful. SS-NMR can be used to directly observe nuclei, detect light atoms and phases without a long-range order, and provide dynamics information such as ionic movement and molecular motion in more detail. Two hydrogens in CDP were identified by 1 H magic angle spinning (MAS) NMR spectroscopy. Cs MAS NMR spectra of the mixture of CDP and CPDP were reported.7 The peaks corresponding to each compound were assigned, but the 1 H peaks of the mixture of CDP and CPDP were not clearly assigned due to the possible overlapping of the signals for CPDP and CDP.7 In this work, the 1 H, 31 P, and 133Cs MAS NMR spectra of pure CPDP with clear peak assignments are presented, and the confirmation of the purity of CPDP is demonstrated, which is not possible with XRD techniques.Since the stoichiometric mole ratio of H 3 PO 4 and Cs 2 CO 3 for CPDP synthesis is 4:1, as described by 4H 3 PO 4 + Cs 2 CO 3 → 2CsH 5 (PO 4 ) 2 + H 2 O + CO 2↑ , CPDP was prepared as follows. First, 16 mmol H 3 PO 4 (85 wt %, d = 1.685 g/mL, Sigma Aldrich, USA) was placed into a 50-mL beaker, and 4 mmol Cs 2 CO 3 (99.995%, Sigma Aldrich) was added. All of the reagents were weighed for accurate stoichiometric matching. The reagent mixture slurry was stirred well with a glass bar prior to carefully adding 1 mL of distilled water into the slurry to dissolve all the Cs 2 CO 3 , and stirred more until the solution became transparent. The transparent solution was transferred to a clean beaker and kept at 100°C for 24 h. The synthesized CPDP powder was identified with X'Pert PRO-MPD XRD (Philips, Netherland). All NMR spectra were obtained on a 14.1 T unity INOVA NMR spectrometer (Varian, USA) using a MAS probe for 2.5-mm zirconia rotors spun at 20 kHz for Cs MAS NMR spectra of CsH5(PO4)2.

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Bulk and surface properties of ionic salt CsH5(PO4)2

Cited by 43 publications

References 14 publications

Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

A Flexible CsH₅(PO₄)₂-Doped Composite Electrolyte Membrane for Intermediate-Temperature Fuel Cells

Characterization of Solid Acid Electrolyte CsH₅(PO₄)₂by NMR Spectroscopy

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Bulk and surface properties of ionic salt CsH5(PO4)2

Cited by 43 publications

References 14 publications

Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

A Flexible CsH5(PO4)2-Doped Composite Electrolyte Membrane for Intermediate-Temperature Fuel Cells

Characterization of Solid Acid Electrolyte CsH5(PO4)2by NMR Spectroscopy

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Product

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A Flexible CsH₅(PO₄)₂-Doped Composite Electrolyte Membrane for Intermediate-Temperature Fuel Cells

Characterization of Solid Acid Electrolyte CsH₅(PO₄)₂by NMR Spectroscopy