Evaluation of ionic conductivity for Mg–Al layered double hydroxide intercalated with inorganic anions

This study demonstrates that humidity, temperature, and the interlayer anions influence ionic conductivities of Mg–Al layered double hydroxides (LDHs) intercalated with inorganic anions. Results show that Mg–Al LDH intercalated with Br− exhibited the highest ionic conductivity among Mg–Al LDHs intercalated with CO32−, Cl−, Br−, NO3− and SO42−. Its ionic conductivity was 1.1 × 10− 2 S cm− 1 at 80 °C under 80% relative humidity. The electromotive force for the hydroxide ion concentration cell using Mg−Al CO32− LDH showed the same behavior with that using an anion exchange membrane, indicating that Mg–Al CO32− LDH can be a hydroxide ion conductor.