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

摘要

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 CO_3~(2-), Cl-, Br-, NO3- and SO_4~(2-). 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 CO_3~(2-) LDH showed the same behavior with that using an anion exchange membrane, indicating that Mg-Al CO_3~(2-) LDH can be a hydroxide ion conductor.