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Hydroxide ion Conduction Mechanism in Mg-Al CO32- Layered Double Hydroxide

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Title: Hydroxide ion Conduction Mechanism in Mg-Al CO32- Layered Double Hydroxide
Authors: Kubo, Daiju Browse this author
Tadanaga, Kiyoharu Browse this author →KAKEN DB
Hayashi, Akitoshi Browse this author
Tatsumisago, Masahiro Browse this author
Keywords: Layered Double Hydroxide
Hydroxide Ion Conductor
Ionic Conduction Mechanism
Deuterium Water Replacement
Issue Date: May-2021
Publisher: Korean Electrochemistry Society
Journal Title: Journal of Electrochemical Science and Technology
Volume: 12
Issue: 2
Start Page: 230
End Page: 236
Publisher DOI: 10.33961/jecst.2020.01424
Abstract: Ionic conduction mechanism of Mg-Al layered double hydroxides (LDHs) intercalated with CO32- (Mg-Al CO32- LDH) was studied. The electromotive force for the water vapor concentration cell using Mg-Al CO32- LDH as electrolyte showed water vapor partial pressure dependence and obeyed the Nernst equation, indicating that the hydroxide ion transport number of Mg-Al CO32- LDH is almost unity. The ionic conductivity of Mg(OH)(2), MgCO3 and Al-2(CO3)(3) was also examined. Only Al-2(CO3)(3) showed high hydroxide ion conductivity of the order of 10(-4) S cm(-1) under 80% relative humidity, suggesting that Al-2(CO3)(3) is an ion conducting material and related to the generation of carrier by interaction with water. To discuss the ionic conduction mechanism, Mg-Al CO32- LDH having deuterium water as interlayer water (Mg-Al CO32-LDH(D2O)) was prepared. After the adsorbed water molecules on the surface of Mg-Al CO32- LDH(D2O) were removed by drying, DC polarization test for dried Mg-Al CO32- LDH(D2O) was examined. The absorbance attributed to O-Dstretching band for Mg-Al CO32- LDH(D2O) powder at around the positively charged electrode is larger than that before polarization, indicating that the interlayer in Mg-Al CO32- LDH is a hydroxide ion conduction channel.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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