Abstract With the advent of the internet of things (IoT) generation, functional electronics have rapidly emerged as a spotlight in materials science and electronic engineering. Ionogels have gained significant attention due to their unique physicochemical properties, such as non-volatility, excellent thermal and electrochemical stability, mechanical properties, and ionic conductivity, making them crucial materials in flexible electronics. This work focuses on the review of research progress in the design of ionogels with diverse functionalities and their applications in flexible electronics (primarily over the past five years), as compared to previously published reviews. In this review, we comprehensively introduce the fundamental composition and structure of ionogels based on their structure-property-application relationships. Further discussion highlights innovative applications of ionogels in sensors, energy harvesting devices, storage devices, and smart devices, emphasizing their broad potential in flexible electronics. Finally, we propose future directions for ionogels, including multifunctional integration, long-term stability, and self-healing capabilities for future research, intended to provide guidance and insights for researchers in flexible electronics.
Liu et al. (2025) studied this question.