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Boosting Contact Electrification By Amorphous Polyvinyl Alcohol Endowing Improved Contact Adhesion and Electrochemical Capacitance.
Advanced Materials 2024 April 24
Ion conductive hydrogels are relevant components in wearable, biocompatible and biodegradable electronics. Polyvinyl-alcohol (PVA) homopolymer is often the favoured choice for integration into supercapacitors and energy harvesters as in sustainable triboelectric nanogenerators (TENGs). However, to further improve hydrogel-based TENGs, a deeper understanding of the impact of their composition and structure on devices performance is necessary. We show ionic hydrogels based on an amorphous-PVA (a-PVA) allowing to fabricate TENGs that outperform the one based on the homopolymer. When used as tribomaterial, the Li-doped a-PVA allows to achieve a 2-fold higher pressure sensitivity compared to PVA, and to develop a conformable e-skin. When used as an ionic conductor encased in an elastomeric tribomaterial, 100 mW/cm2 average power is achieved, providing 25% power increase compared to PVA. At the origin of such enhancement is the increased softness, stronger adhesive contact, higher ionic mobility (> 3,5-fold increase), and long-term stability achieved with Li-doped a-PVA. These improvements are attributed to the high density of hydroxyl groups and amorphous structure present in the a-PVA, allowing a strong binding to water molecules. This work discloses novel insights on those parameters allowing to develop easy-processable, stable and highly conductive hydrogels for integration in conformable, soft and biocompatible TENGs. This article is protected by copyright. All rights reserved.
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