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High-Performance, Highly Stretchable, Flexible Moist-Electric Generators via Molecular Engineering of Hydrogels

机译：High-Performance, Highly Stretchable, Flexible Moist-Electric Generators via Molecular Engineering of Hydrogels

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Harvesting energy from ubiquitous moisture has emerged as a promisingtechnology, offering opportunities to power wearable electronics. However,low current density and inadequate stretching limit their integration into selfpoweredwearables. Herein, a high-performance, highly stretchable, and flexiblemoist-electric generator (MEG) is developed via molecular engineering ofhydrogels. The molecular engineering involves the impregnation of lithiumions and sulfonic acid groups into the polymer molecular chains to create ionconductiveand stretchable hydrogels. This new strategy fully leverages themolecular structure of polymer chains, circumventing the addition of extraelastomers or conductors. A centimeter-sized hydrogel-based MEG can generatean open-circuit voltage of 0.81 V and a short-circuit current density ofup to 480 μA cm~(?2). This current density is more than ten times that of mostreported MEGs. Moreover, molecular engineering improves the mechanicalproperties of hydrogels, resulting in a stretchability of 506%, representing thestate-of-the-art level in reported MEGs. Notably, large-scale integration of thehigh-performance and stretchable MEGs is demonstrated to power wearableswith integrated electronics, including respiration monitoring masks, smarthelmets, and medical suits. This work provides fresh insights into the designof high-performance and stretchable MEGs, facilitating their application toself-powered wearables and broadening the application scenario.

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