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Hydrogels, polymer networks with versatile applications in both energy-related devices and biomedicine, fall into three categories: natural, synthetic, and hybrid hydrogels. Natural variants like alginate and collagen boast biocompatibility, while synthetic counterparts, such as polyacrylamide, offer customizable properties. Hybrid hydrogels seamlessly combine the strengths of both. With their distinctive features, including high water content, flexibility, and porosity, hydrogels prove well-suited for applications in energy storage devices and biomedicine. In the energy sector, hydrogels serve as electrolytes, separators, and electrodes, enhancing battery performance and enabling the functionality of supercapacitors and fuel cells. This review initiates by exploring the pivotal role of hydrogels as energy storage devices, particularly in batteries and supercapacitors. It delves into the design principles and fabrication techniques utilized to augment the electrochemical performance, durability, and safety of hydrogel-based energy storage systems. The examination extends to various hydrogel types, such as PAMPS, PAA, and PEO hydrogels, assessing their suitability for high-performance batteries and flexible supercapacitors. Additionally, this review scrutinizes the burgeoning biomedical technologies where hydrogels play a crucial role, emphasizing their contributions to tissue engineering, drug delivery systems, biosensors, and wound healing. The unique attributes of hydrogels, including biocompatibility, adaptable mechanical properties, and controlled release capabilities, position them favorably for diverse biomedical applications. The discussion highlights notable hydrogel systems, such as alginate-based, PEGDA, and PVA hydrogels, in the context of these advancements in biomedicine. [ABSTRACT FROM AUTHOR]

The present work describes the synthesis of a material consisting of a bisimidazolium ionic liquid supported on graphene oxide. The prepared nanocomposite was characterized by different physicochemical techniques such as FT-IR, XRD, CHN, SEM, TEM and EDAX. The synthesized nanocomposite was further utilized as an effective heterogeneous catalyst for the synthesis of tetraketone derivatives, which are biologically significant, using dimedone and aryl aldehydes as the substrates at 50 °C and a green solvent. One of the tetraketone products has been confirmed by single crystal XRD. The catalyst displayed high reaction yields, facile separation, short reaction time, good stability and recoverability up to six consecutive reaction rounds with no discernible loss in its catalytic activity. [ABSTRACT FROM AUTHOR]