Enhanced electroactive β-phase of the sonication-process-derived PVDF-activated carbon composite film for efficient energy conversion and a battery-free acceleration sensor
Enhanced electroactive β-phase of the sonication-process-derived PVDF-activated carbon composite film for efficient energy conversion and a battery-free acceleration sensor
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DOI：
10.1039/c7tc00568g
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发表时间：
2017-05-28
影响因子：
6.4
通讯作者：
Kim, Sang-Jae
中科院分区：
文献类型：
--
作者：
Alluri, Nagamalleswara Rao;Chandrasekhar, Arunkumar;Kim, Sang-Jae
采用超声工艺制备了一种柔性、轻质、高效的30 V/V%浓度的聚偏氟乙烯-活性炭（C-PVDF-AC）复合膜，并对其进行了热处理，研究了其用于非常规能量转换和主动传感目的（不含电池能量）。超声处理的使用产生了PVDF的高电活性β相，而不需要额外的电极化处理。在PVDF中加入交流填料稳定并改善了PVDF的电活性β相，并作为PVDF - ch2 -/- cf2 -电偶极子之间的导电通道。超声过程衍生的PVDF和复合膜的介电常数和电导率随频率的变化表现出更好的响应，这是由于交流填料与PVDF分子链之间的电偶极子-偶极子相互作用和界面相互作用的改善。未极化PVDF纳米发电机（P-NG）和复合纳米发电机（C-NG）在6.6 kPa压力下产生的V- oc和I-SC峰间值分别为37.77 V和299 nA， 37.87 V和0.831 mu A。P-NG输出未观察到电极化效应，而C-NG （30 V/V%）输出显示显著的电压增量（约30%）和电流增量（约96%）。获得的C-NG的瞬时功率密度接近63.07 mW m(-2)，足以驱动led和显示器等低功耗电子器件。实验验证了C-NG装置本身可以作为自供电加速度传感器（SAS），输出电压在0.5 ~ 5 m s（-2）的输入加速度与轴载荷之间呈线性关系。
A flexible, lightweight, and highly efficient poly(vinylidene fluoride)-activated carbon (C-PVDF-AC) composite film in 30 V/V% concentration was derived using the sonication process, followed by heat treatment, and studied for unconventional energy conversion and active sensing purposes (without battery energy). The use of the sonication process originates the high electroactive beta-phase of PVDF without the requirement for an additional electrical poling process. The substitution of AC fillers in PVDF stabilized and improved the electroactive beta-phase of PVDF and also acted as electrical conduction paths between -CH2-/-CF2- electric dipoles of PVDF. The frequency-dependent dielectric constant and electrical conductivity of the sonication-process-derived PVDF and composite films showed a better response, which was due to the improvement in the electric dipole-dipole interactions and interfacial interactions between the AC fillers and PVDF molecular chains. An unpoled PVDF nanogenerator (P-NG) and composite nanogenerator (C-NG) generated high peak-to-peak V-OC and I-SC values of 37.77 V and 299 nA and 37.87 V and 0.831 mu A, respectively, under 6.6 kPa pressure. No electrical poling effect was observed in P-NG output, whereas C-NG (30 V/V%)'s output showed a significant voltage increment (approximate to 30%) and current increment (approximate to 96%). The obtained instantaneous power density approximate to 63.07 mW m(-2) of C-NG was sufficient to drive low-power electronic devices such as LEDs and displays. It was experimentally verified that the C-NG device itself can act as a self-powered acceleration sensor (SAS) and the output voltage showed a linear behavior between the input accelerations from 0.5 to 5 m s(-2) and the shaft load.