Structure and the conductive behaviour of hydrate melt coexisting with porous solid materials—α-Al2O3powder/ZnCl2hydrate melt coexisting system

Mizuhata, Minoru; Sumihiro, Yasushi; Deki, Shigehito

doi:10.1039/b311880k

Cited by 17 publications

(12 citation statements)

References 24 publications

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“…These peaks shifted toward the lower temperature with the decrease of the liquid content. This behavior was similar to our previous studies and we reported that the thermochemical property of liquid phase depends on the hydrophilicity of the coexisting solid surface (20). In order to discuss dynamics of solvent molecules in restricted area between dispersed nanoparticles, we proposed the spatial model that liquid layer is on solid surface and such particles are monodispersed as hexagonal close-packed described in Fig.…”

Section: Phase Diagram and Electrostriction Of Bulk Aqueous Solutionsupporting

confidence: 87%

Properties of Concentrated Aqueous Electrolyte Solution in a Vicinal Region of Coexisting Solid Surface

et al. 2017

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Properties of concentrated ZnSO 4 aqueous solutions coexisting with metal oxide nanoparticles were observed. Raman spectroscopy indicated that ion pair forming tendencies was enhanced in the vicinity of silica nanoparticles which have hydrophilic groups. Zn 2+ is supposed not to make sufficient hydration sphere and tend to make contact ion pair due to sharing water molecules with hydrophilic solid surface. Alumina nanoparticles exhibited strong effect on 1 H relaxation than silica nanoparticles. The salt concentration dependences of 1 H relaxation time and pH of aqueous solution suggested that the effects from solid phase on coexisting liquid phase were affected by liquid property in itself.

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Section: Phase Diagram and Electrostriction Of Bulk Aqueous Solutionsupporting

confidence: 87%

Properties of Concentrated Aqueous Electrolyte Solution in a Vicinal Region of Coexisting Solid Surface

et al. 2017

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“…Among the electrolytes investigated, the ionic conductivity of ZnCl 2 · n H 2 O reaches a maximum at n = 10 and decreases with increasing ZnCl 2 content ( Figure 2 a). The drop in the bulk conductivity suggests that the addition of ZnCl 2 gives rise to increase in ionic interactions and interferes the liquid dynamics . Nevertheless, a reasonably high value of 15 mS cm −1 is attained at the most concentrated ZnCl 2 ·2.33H 2 O at 30 °C.…”

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confidence: 99%

A Room‐Temperature Molten Hydrate Electrolyte for Rechargeable Zinc–Air Batteries

Chen

Matsumoto

Kubota

et al. 2019

Advanced Energy Materials

152

128

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Aqueous Zn‐based batteries are attracting extensive interest because of their economic feasibility and potentially high energy density. However, poor rechargeability of Zn anode in conventional electrolytes resulting from dendrite formation and self‐corrosion hinders their practical implementation. Herein, a Zn molten hydrate composed of inorganic Zn salt and water is demonstrated as an advantageous electrolyte for solving these issues. In this electrolyte, dendrite‐free Zn deposition/dissolution reaction with a high Coulombic efficiency (≈99%) as well as long‐term stability, free from CO2 poisoning are realized. The resultant Zn–air cell exhibits a reversible capacity of 1000 mAh g(catalyst)−1 over 100 cycles at 30 °C. Combined with the intrinsic safety associated with aqueous chemistry and cost benefit of the raw material, the present Zn–air battery makes a strong candidate for large‐scale energy storage.

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“…The hydrophilicity of SiO2 (290) is also one of the main reasons for this phenomenon. It was reported that the hydrophilicity of the coexisting solid phase affected the melting of salt: α-alumina additive reduced the melting point of salt, whereas no change in melting behavior was observed in the case of SiC 3), 32) . The surface of SiP2O should be more hydrophilic than that of SiO2(3.)…”

Section: )30)mentioning

confidence: 99%

Development of Novel Proton Conductors Consisting of Solid Acid/pyrophosphate Composite for Intermediate-temperature Fuel Cells

Matsui

Muroyama

Kikuchi

et al. 2010

J. Jpn. Petrol. Inst.

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Fuel cells are attractive energy conversion devices with high efficiencies and low emissions, and many studies have been conducted so far. Among them, fuel cells operating at 200-00℃ are promising technologies which combine the many advantages of high-and low-temperature fuel cells. However, they have not been developed due to the lack of good ionic-conductors with high thermal stability at intermediate temperatures. Recently, we have developed new proton-conductive electrolytes consisting of solid acid and pyrophosphate, and evaluated their electrochemical, structural and thermal properties at intermediate temperatures. For the composite based on CsH2PO/SiP2O, the interfacial chemical reaction between CsH2PO and SiP2O during heat-treatment gave rise to the formation of a new phase of CsH5(PO)2. The temperature dependence of conductivity for this composite was different from that for pure CsH2PO, and the maximum conductivity achieved was mS・cm -at 2℃. Using potassium and rubidium salts, MH2PO (M＝K, Rb), as the solid acids for the composite electro lytes, analogous phenomena were confirmed despite the alkaline metal. Operation of a fuel cell employing CsH2PO/SiP2O-based composite electrolyte (thickness: ca. .3 mm) was demonstrated at 200℃ and generated electricity up to 220 mA・cm -2 at 0.2 V. CsH5(PO)2 composites with SiP2O and SiO2 were fabricated, and the composite effects were investigated at intermediate temperatures based on conductivity measurement, thermal analysis, and wettability evaluation. The melting and dehydration processes of CsH5(PO)2 in composites were different depending on the matrix species. The composite with SiP2O matrix showed the highest conductivity of all composites. The conductivity of the composites appears to correlate with the wettability between the components as examined by contact angle measurement. These findings should be attributed to the differences in the interfacial interactions between CsH5(PO)2 and the matrix.

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Structure and the conductive behaviour of hydrate melt coexisting with porous solid materials—α-Al₂O₃powder/ZnCl₂hydrate melt coexisting system

Cited by 17 publications

References 24 publications

Properties of Concentrated Aqueous Electrolyte Solution in a Vicinal Region of Coexisting Solid Surface

Properties of Concentrated Aqueous Electrolyte Solution in a Vicinal Region of Coexisting Solid Surface

A Room‐Temperature Molten Hydrate Electrolyte for Rechargeable Zinc–Air Batteries

Development of Novel Proton Conductors Consisting of Solid Acid/pyrophosphate Composite for Intermediate-temperature Fuel Cells

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