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The Role of Interfaces in Ionic Liquid‐Based Hybrid Materials (Ionogels) for Sensing and Energy Applications
Journal article   Open access   Peer reviewed

The Role of Interfaces in Ionic Liquid‐Based Hybrid Materials (Ionogels) for Sensing and Energy Applications

Ji Wei Suen, Naveen Elumalai, Sujan Debnath, Nabisab Mubarak, Chye ing Lim and Mohan M. Reddy
Advanced Materials Interfaces, Vol.9(34), pp.1-35
2022
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Abstract

cellulose energy ionic liquids ionogels polymers
Ionogels have established themselves as an intriguing type of composites, owing to their distinctive properties, including superior thermal stability, non‐flammability, tunable electrochemical stability window, and high ionic conductivity. Hybrid materials based on ionic liquids (ionogels) are held together by interfaces arising out of intermolecular interactions, including electrostatic, van der Waals, solvophobic, steric, and hydrogen bonding. The interfaces within the ionic liquid (ILs) and its multifaceted interplay with the encapsulating matrix greatly influence the physicochemical and electronic/ionic interactions within the composite resulting in exceptional characteristics, allowing for the design of ionogels for targeted applications. Though ionogels have shown superior properties comparable to neat ILs, they still exhibit relatively low mechanical strength, limiting their application in several practical technologies. Simultaneous enhancement of mechanical durability while retaining high ionic conductivity is indispensable, which requires understanding interfaces and related influencing parameters. This review provides a synergetic comprehension, focusing on the interactive forces and factors affecting the conductivity, stability, and robustness of ionogels. Correlating with interfaces, several strategies, including the implications of nanofiller incorporation on the electromechanical properties of ionogel, are also elaborated. Finally, a primer is provided on the application of ionogels in sensors and energy harvesting technologies. Ionogels are an emerging class of hybrid materials endowed with outstanding thermal, electrical, and mechanical properties. This material system's high versatility and superior tunability attract significant interest among researchers encompassing a broad spectrum of applications, including energy, flexible electronics, and biomedical. This review paper focuses on exploring the interactions within ionogels and their influence on electrochemical and mechanical performance.

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