Front Cover: Unusual switching of ionic conductivity in ionogels enabled by water-induced phase separation

Zhang et al. develop an unprecedented humidity-responsive ionogel. At low humidity, the ionogel exhibits a high ionic conductivity due to the high mobility of the ions within the swollen polymer networks. When the ambient humidity rises, the ion motion is restricted by the strong polymer chain aggregation induced by water, resulting in a lower ionic conductivity. (e249)