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- 저자 : Tadanaga, Kiyoharu (검색결과 1 건)
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Hydroxide ion Conduction Mechanism in Mg-Al CO<sub>3</sub><sup>2-</sup> Layered Double Hydroxide
Kubo, Daiju,Tadanaga, Kiyoharu,Hayashi, Akitoshi,Tatsumisago, Masahiro The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.2
Ionic conduction mechanism of Mg-Al layered double hydroxides (LDHs) intercalated with CO<sub>3</sub><sup>2-</sup> (Mg-Al CO<sub>3</sub><sup>2-</sup> LDH) was studied. The electromotive force for the water vapor concentration cell using Mg-Al CO<sub>3</sub><sup>2-</sup> LDH as electrolyte showed water vapor partial pressure dependence and obeyed the Nernst equation, indicating that the hydroxide ion transport number of Mg-Al CO<sub>3</sub><sup>2-</sup> LDH is almost unity. The ionic conductivity of Mg(OH)<sub>2</sub>, MgCO<sub>3</sub> and Al<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> was also examined. Only Al<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> showed high hydroxide ion conductivity of the order of 10<sup>-4</sup> S cm<sup>-1</sup> under 80% relative humidity, suggesting that Al<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> is an ion conducting material and related to the generation of carrier by interaction with water. To discuss the ionic conduction mechanism, Mg-Al CO<sub>3</sub><sup>2-</sup> LDH having deuterium water as interlayer water (Mg-Al CO<sub>3</sub><sup>2-</sup> LDH(D<sub>2</sub>O)) was prepared. After the adsorbed water molecules on the surface of Mg-Al CO<sub>3</sub><sup>2-</sup> LDH(D<sub>2</sub>O) were removed by drying, DC polarization test for dried Mg-Al CO<sub>3</sub><sup>2-</sup> LDH(D<sub>2</sub>O) was examined. The absorbance attributed to O-D-stretching band for Mg-Al CO<sub>3</sub><sup>2-</sup> LDH(D<sub>2</sub>O) powder at around the positively charged electrode is larger than that before polarization, indicating that the interlayer in Mg-Al CO<sub>3</sub><sup>2-</sup> LDH is a hydroxide ion conduction channel.
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