材料科学
生物电子学
自愈水凝胶
共形矩阵
聚乙烯醇
弹性体
超级电容器
离子键合
纳米技术
电解质
化学工程
电容
高分子化学
复合材料
生物传感器
电极
离子
有机化学
化学
物理化学
工程类
作者
Lisa Serairi,Chiara Santillo,Philippe Basset,Marino Lavorgna,Giuseppina Pace
标识
DOI:10.1002/adma.202403366
摘要
Abstract 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/cm 2 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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