2019 Volume 127 Issue 11 Pages 788-792
Ionic conductivity of dodecyl sulfate (DS) anion [CH3(CH2)11OSO3−]-intercalated Mg–Al layered double hydroxide (LDH) was examined. Mg–Al DS LDH showed higher ionic conductivity under low humidity than Mg–Al CO32− LDH, the most typical LDH. The conductivity of Mg–Al DS LDH was 7.6 × 10−4 S cm−1 at 80°C 30%RH, whereas that of Mg–Al CO32− LDH was 1.1 × 10−4 S cm−1. This higher ionic conductivity is attributed to the increased amount of the adsorbed water with intercalation of DS anion. The increase of surface water probably provides a path for hydroxide ion conduction, which results in the higher ionic conductivity under low humidity. Additionally, Mg–Al DS LDH retained high ionic conductivity for a longer storage under low humidity.