Rui Chen, Rongxi Guo, Ying Li, Hao Yan, Jin Huang, Hexiang Xu, Wei Shi, Zongzheng Zhang, Shuyun Zhuo, Mingjie Liu
Hydrogels are promising ion conductors for ionic sensory systems. This review summarizes ion transport in hydrogels and highlights ionic sensors, transporters, processors, effectors, and power sources, along with challenges and future directions.