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2D WS2 embedded PVDF nanocomposites for photosensitive piezoelectric nanogenerators with a colossal energy conversion efficiency of ∼25.6%
Nanoscale ( IF 5.8 ) Pub Date : 2021-08-26 , DOI: 10.1039/d1nr03808g Didhiti Bhattacharya 1 , Sayan Bayan 1 , Rajib Kumar Mitra 1 , Samit K Ray 1, 2
Nanoscale ( IF 5.8 ) Pub Date : 2021-08-26 , DOI: 10.1039/d1nr03808g Didhiti Bhattacharya 1 , Sayan Bayan 1 , Rajib Kumar Mitra 1 , Samit K Ray 1, 2
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Benefiting from the advantages of low cost, light weight and mechanical flexibility, piezoelectric nanogenerators have the potential for application in renewable energy harvesting from various unexplored sources. Here, we report the demonstration of the record efficiency of flexible piezoelectric nanogenerators (PENG) using composites of polyvinylidene fluoride (PVDF) and chemically exfoliated tungsten disulfide (WS2) nanosheets, which are found to be strongly photosensitive, making them attractive for self-powered optical devices. The presence of two-dimensional (2D) WS2 nanosheets in the PVDF matrix plays a dual role in enhancing the nucleation of the electroactive β-phase as well as inducing strong photosensitivity in the nanocomposite. The PVDF-WS2 composed flexible device is able to produce an enormously high output voltage of ∼116 V (for an impact of 105 kPa) and a piezoelectric energy conversion efficiency of ∼25.6%, which is the highest among the reported values for PVDF-2D material based self-poled piezoelectric nanogenerators. This self-poled piezo-phototronic device exhibits strain-dependent photocurrent at zero bias and exhibits a responsivity of 6.98 × 10−3 A W−1 at 0.75% strain under the illumination of 410 nm. The fabricated PENG is also able to harvest energy from routine human activities (finger tapping, writing on paper, mouse clicking, etc.) and movement of human body parts. These results open up a new horizon in piezo-phototronic materials through the realization of photosensitive multifunctional PENGs, which can be scaled up for fabricating compact, high performance, portable and self-powered wearable electronic devices for smart sensor applications.
中文翻译：
用于光敏压电纳米发电机的二维 WS2 嵌入 PVDF 纳米复合材料，具有约 25.6% 的巨大能量转换效率
受益于低成本、重量轻和机械灵活性的优势，压电纳米发电机有可能应用于从各种未开发的来源收集可再生能源。在这里，我们报告了使用聚偏二氟乙烯 (PVDF) 和化学剥离二硫化钨 (WS 2 ) 纳米片复合材料的柔性压电纳米发电机 (PENG) 的创纪录效率的演示，发现它们具有很强的光敏性，使它们对自发电具有吸引力。动力光学设备。PVDF 基体中二维 (2D) WS 2纳米片的存在在增强电活性 β 相的成核以及在纳米复合材料中诱导强光敏性方面起着双重作用。PVDF-WS 2组成的柔性器件能够产生~116 V 的极高输出电压（对于 105 kPa 的冲击）和~25.6% 的压电能量转换效率，这是基于 PVDF-2D 材料的自报告值中最高的-极化压电纳米发电机。这种自极化压电光电器件在零偏压下表现出依赖于应变的光电流，并且在 410 nm 的照射下在 0.75% 应变下表现出 6.98 × 10 -3 AW -1的响应度。制造的 PENG 还能够从人类日常活动（手指敲击、在纸上书写、鼠标点击等）中获取能量.) 和人体部位的运动。这些结果通过实现光敏多功能 PENGs 为压电光电材料开辟了新的视野，该 PENGs 可以扩大用于制造用于智能传感器应用的紧凑、高性能、便携式和自供电的可穿戴电子设备。
更新日期：2021-09-16
中文翻译：
用于光敏压电纳米发电机的二维 WS2 嵌入 PVDF 纳米复合材料，具有约 25.6% 的巨大能量转换效率
受益于低成本、重量轻和机械灵活性的优势，压电纳米发电机有可能应用于从各种未开发的来源收集可再生能源。在这里，我们报告了使用聚偏二氟乙烯 (PVDF) 和化学剥离二硫化钨 (WS 2 ) 纳米片复合材料的柔性压电纳米发电机 (PENG) 的创纪录效率的演示，发现它们具有很强的光敏性，使它们对自发电具有吸引力。动力光学设备。PVDF 基体中二维 (2D) WS 2纳米片的存在在增强电活性 β 相的成核以及在纳米复合材料中诱导强光敏性方面起着双重作用。PVDF-WS 2组成的柔性器件能够产生~116 V 的极高输出电压（对于 105 kPa 的冲击）和~25.6% 的压电能量转换效率，这是基于 PVDF-2D 材料的自报告值中最高的-极化压电纳米发电机。这种自极化压电光电器件在零偏压下表现出依赖于应变的光电流，并且在 410 nm 的照射下在 0.75% 应变下表现出 6.98 × 10 -3 AW -1的响应度。制造的 PENG 还能够从人类日常活动（手指敲击、在纸上书写、鼠标点击等）中获取能量.) 和人体部位的运动。这些结果通过实现光敏多功能 PENGs 为压电光电材料开辟了新的视野，该 PENGs 可以扩大用于制造用于智能传感器应用的紧凑、高性能、便携式和自供电的可穿戴电子设备。
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