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Hydroxide ion Conduction Mechanism in Mg-Al CO32- Layered Double Hydroxide
| 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 |
| URI: | http://hdl.handle.net/2115/82207 |
| 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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