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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS

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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS ( high-performance-triboelectric-nanogenerator-and-its-applica )

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long life-time. Given the limited capacity of energy storage devices, one promising solution is to integrate energy harvesting and storage materials to efficiently convert ambient mechanical energy to electricity for direct use or to store the harvested energy by electrochemical means. Different methods to integrate TENG with supercapacitors have been proposed, however, most of these methods suffer from drawbacks.156, 158, 159 For example, TENG working in contact-separation mode usually need a spacer, which makes it difficult to fabricate integrated and compact devices. One the other hand, the liquid electrolyte in conventional supercapacitors will evaporate if exposed to air, thus proper encapsulation of the supercapacitor is required, which makes the TENG-supercapacitor device bulky. Furthermore, the TENG and supercapacitors are usually made as two separate parts, so external wiring for electrical connection is needed, which adds extra volume to the system. Here, we propose a simple technique to fabricate a flexible self-charging power unit, which integrates a single-electrode-mode TENG device with 2D MXene-based solid- state microsupercapacitor (MSC) into a single monolithic device with silicone rubber as encapsulation material. Our device could simultaneously and effectively convert and store mechanical energy of human biomechanical motions into electrochemical energy. In addition, our device can have a long lifetime for continuous energy harvesting and storage, which can be useful for powering electronics without additional power sources. 3.3.1 Design of Wearable Self-Charging Power Unit Figure 35a displays the schematic illustration of the detailed device structure. Three main components (current collector for TENG, rectifier and microsupercapacitor) were 93

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