Enhancing Ion Transport in Layered Ionic Hydrogel-Based Energy Harvesting
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초록
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The effective extraction of electricity from low-frequency regimes remains a persistent challenge for various energy-harvesting techniques. To address this challenge, we designed an advanced ionic energy harvester that relies on polymer hydrogel to capture low-frequency mechanical vibrations by exploiting the slow diffusion of ions. As an ionic device, we fabricated a three-layered hydrogel structure, combining two hydrogels with different stiffness properties, separated by an ion-selective hydrogel. By applying compressive mechanical stimulation, each hydrogel exhibited different degree of compression which can control ion transport in specific directions. In addition, using ion-selective hydrogels in the middle layer allows selective ion transportation, resulting in charge separation between top and bottom layers. Therefore, mechanical energy could be converted into electricity by creating an electric potential difference within layered hydrogels.