Advances and challenges in conductive hydrogels: From properties to applications

Sodium-ion batteries (SIBs) are experiencing a large-scale renaissance to supplement or replace expensive lithium-ion batteries (LIBs) and low energy density lead-acid batteries in electrical energy storage systems and other applications. In this case, layered oxide materials have become one of the most popular cathode candidates for SIBs because of their low cost and comparatively facile synthesis method. However, the intrinsic shortcomings of layered oxide cathodes, which severely limit their commercialization process, urgently need to be addressed. In this review, inherent challenges associated with layered oxide cathodes for SIBs, such as their irreversible multiphase transition, poor air stability, and low energy density, are systematically summarized and discussed, together with strategies to overcome these dilemmas through bulk phase modulation, surface/interface modification, functional structure manipulation, and cationic and anionic redox optimization. Emphasis is placed on investigating variations in the chemical composition and structural configuration of layered oxide cathodes and how they affect the electrochemical behavior of the cathodes to illustrate how these issues can be addressed. The summary of failure mechanisms and corresponding modification strategies of layered oxide cathodes presented herein provides a valuable reference for scientific and practical issues related to the development of SIBs.

Routes to high-performance layered oxide cathodes for sodium-ion batteries.

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There has been advancement in the preparation of coated slow-release fertilizer, but problems remain, such as a complex production process, high production costs, and uncontrollable nutrient releas...

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Electroactive hydrogels, which exhibit intelligent deformation in response to electric fields, have garnered significant attention as potential actuating materials for flexible sensors, smart devices, soft actuators, and artificial muscles. In the process of converting mechanical energy to electrical energy, electroactive hydrogels can achieve efficient energy conversion and charge transfer due to their porous structure, high water solubility, flexibility, and electrical conductivity. However, the limited performance of single-functional electroactive hydrogels severely hampers their development prospects. To expand the application areas of these gels in self-powered devices, smart response devices, and other directions, there is a need to design electroactive hydrogels with multiple properties. In this paper, we present a systematic review of the mechanism and preparation strategies of electroactive hydrogels in response to electric fields. We also discuss the design strategy for electroactive hydrogels with multiple properties and provide an overview of the current progress in their applications. Furthermore, we analyze the role and advantages of electroactive hydrogels. Finally, we address the existing problems in electroactive hydrogel research and offer suggestions to solve them, and we hope that this design idea will inspire readers and researchers in the field. 

Advances in preparation, design strategy and application of electroactive hydrogels

Self-assembled peptide fibers encapsulated with in situ synthesized AgNPs exhibiting catalytic and antibacterial properties

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