Solubility and crystallization of BaHPO4 crystals

Pan, Dongying; Yuan, D. R.; Sun, H. Q.; Guo, S.Y.; Wang, Xinqiang; Duan, Xiulan; Luan, Caìna; Li, Z. F.

doi:10.1002/crat.200510566

Cited by 13 publications

(8 citation statements)

References 6 publications

(4 reference statements)

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“…At 590 and 530 cm À1 P-O-H wagging and rocking vibrational bands are found [27,28]. These observations also confirmed that the synthesized compound was BHP and well agreed with the previous reports.…”

supporting

confidence: 89%

Barium Hydrogen Phosphate Modified Carbon Paste Electrode for the Simultaneous Determination of Cadmium and Lead by Differential Pulse Anodic Stripping Voltammetry

et al. 2011

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The barium hydrogen phosphate modified carbon paste electrode (BHP-CPE) was prepared as an electrochemical sensor. Its propensity towards the simultaneous determination of Cd(II) and Pb(II) has been demonstrated with differential pulse anodic stripping voltammetry (DPASV) in the potential window between À1.2 V to À0.4 V. Important operational parameters such as pH of the solution, deposition potential and deposition time have been optimized. Under the optimized conditions, calibration curves were linear in the concentration range 1 10 À8 to 8 10 À8 M on BHP-CPE and 1 10 À8 to 5 10 À8 M on Nafion-BHP-CPE. Experiments disclosed that BHP-CPE and Nafion-BHP-CPE exhibit good performance for the simultaneous determination of Cd(II) and Pb(II).

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confidence: 89%

Barium Hydrogen Phosphate Modified Carbon Paste Electrode for the Simultaneous Determination of Cadmium and Lead by Differential Pulse Anodic Stripping Voltammetry

et al. 2011

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“…29 These characteristics suggest that compounds in which some portion of the Ba in Ba 3 (PO 4 ) 2 has been replaced with a combination of an alkali metal, specifically, K, because of its similar size to Ba, and a proton can be synthesized, that such compounds will display high, if not superprotonic, conductivity, and that they will exhibit such behavior over a temperature range spanning from below ambient to values typical of dehydration in other superprotonic compounds (well over 200 °C). Moreover, the water insolubility of both Ba 3 (PO 4 ) 2 and the related solid acid BaHPO 4 30 suggests that compounds with the hypothesized stoichiometry, Ba 3-x K x H x (PO 4 ) 2 ,will additionally display a high degree of insolubility in water.…”

Section: Introductionmentioning

confidence: 99%

Engineering the Next Generation of Solid State Proton Conductors: Synthesis and Properties of Ba_3−xK_xH_x(PO₄)₂

2010

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A new series of compounds with general chemical formula Ba 3-x K x H x (PO 4 ) 2 has been successfully prepared. This particular stoichiometry was targeted as a candidate solid-state proton conductor because of its anticipated structural similarity to known M 3 H(XO 4 ) 2 superprotonic conductors (M = Cs, Rb, NH 4 , K; X=Se, S) 1 and to the known trigonal compound Ba 3 (PO 4 ) 2 . 2 The materials were synthesized from aqueous solution using barium acetate, dipotassium hydrogen phosphate, and potassium hydroxide as starting materials. Through variations in the initial solution stoichiometry or the synthesis temperature, the final stoichiometry could be controlled from x ∼ 0.5 to ∼1. X-ray powder diffraction, energy dispersive spectroscopy chemical analysis, 1 H magic angle spinning (MAS) nuclear magnetic spectroscopy, and thermogravimetric analysis were all employed to establish potassium and proton incorporation. The diffraction data confirmed crystallization of a trigonal phase, and chemical analysis showed the (BaþK):P ratio to be 3:2, consistent with the target stoichiometry. The conductivity of the Ba 3-x K x H x (PO 4 ) 2 materials, as measured by A.C. impedance spectroscopy, is about 3 orders of magnitude greater than the end-member Ba 3 (PO 4 ) 2 material with only a slight dependence on x, however, it is substantially lower than that of typical superprotonic conductors and of the M 3 H(XO 4 ) 2 materials in particular. The close proximity of Ba to the hydrogen bond site is proposed to explain this behavior. At 250 °C, the conductivity is ∼2.4 Â 10 -5 S/cm for the composition x=0.80, which, when combined with the water insolubility and the relatively high thermal stability, may render Ba 3-x K x H x (PO 4 ) 2 an attractive alternative in selected electrochemical applications to known superprotonic conductors.

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“…For BaHPO 4 the onset temperature is higher than reported in the literature, but it should also be kept in mind that BaHPO 4 can be formed in two phases and thermal stability data is only published for the alpha phase and not for the beta phase. (33,34) There is a deviation between the dehydration onset temperature of BaHPO 4 when comparing results from high temperature XRD (changes in spectra visible from 350 o C) and TGA (onset temperature is app. 375 o C) this deviation is most likely due to the measurement conditions.…”

Section: Discussionmentioning

confidence: 99%

Electrochemical Reduction of CO₂ at Temperatures Below 300 ^oC

Hallinder¹,

Holtappels²,

Mogensen³

2012

ECS Trans.

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Reduction of CO2 at intermediate temperatures (T< 300 oC) is a tempting way to produce hydrocarbons. One benefit of performing CO2 reduction below 300 oC is that it would possibly allow a single process for production of hydrocarbons. CsH2PO4, BaHPO4 and a composite thereof have been investigated as electrolyte materials both with respect to thermal stability and to conductivity. BaHPO4 showed an improved thermal stability compared to CsH2PO4, but it did at the same time exhibit a low conductivity (1⋅10-6 S cm-1 at 304 oC). CsH2PO4 started to dehydrate at 249 oC, but this dehydration was shown to be reversible. Its conductivity was measured to be 2⋅10-2 S cm-1 at 240 oC. Full cells with copper as the CO2 reduction catalyst have been manufactured and tested in CO2 containing atmospheres. Initial performance of 34 mA cm-2 at 245 oC has been achieved.

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Solubility and crystallization of BaHPO4 crystals

Cited by 13 publications

References 6 publications

Barium Hydrogen Phosphate Modified Carbon Paste Electrode for the Simultaneous Determination of Cadmium and Lead by Differential Pulse Anodic Stripping Voltammetry

Barium Hydrogen Phosphate Modified Carbon Paste Electrode for the Simultaneous Determination of Cadmium and Lead by Differential Pulse Anodic Stripping Voltammetry

Engineering the Next Generation of Solid State Proton Conductors: Synthesis and Properties of Ba_3−xK_xH_x(PO₄)₂

Electrochemical Reduction of CO₂ at Temperatures Below 300 ^oC

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Solubility and crystallization of BaHPO4 crystals

Cited by 13 publications

References 6 publications

Barium Hydrogen Phosphate Modified Carbon Paste Electrode for the Simultaneous Determination of Cadmium and Lead by Differential Pulse Anodic Stripping Voltammetry

Barium Hydrogen Phosphate Modified Carbon Paste Electrode for the Simultaneous Determination of Cadmium and Lead by Differential Pulse Anodic Stripping Voltammetry

Engineering the Next Generation of Solid State Proton Conductors: Synthesis and Properties of Ba3−xKxHx(PO4)2

Electrochemical Reduction of CO2 at Temperatures Below 300 oC

Contact Info

Product

Resources

About

Engineering the Next Generation of Solid State Proton Conductors: Synthesis and Properties of Ba_3−xK_xH_x(PO₄)₂

Electrochemical Reduction of CO₂ at Temperatures Below 300 ^oC