A water tank triboelectric nanogenerator based on polytetrafluoroethylene (PTFE) is fabricated for harvesting water wave energy. The impacts of contact frequency over a broad frequency range including the frequency range of ocean waves and output characteristics under resistive and capacitive loads for different liquid types are investigated in order to identify the optimal contact frequency and load conditions for maximizing the power density and energy conversion efficiency. In addition, surface modification of PTFE with different patterns for enhancing its hydrophobicity is implemented in order to reduce charge screening. Furthermore, the impact of contact frequency on the output characteristics for the surface modified PTFE is also studied. It is observed that the open-circuit voltage and short-circuit current exhibited opposite trends with increasing contact frequency. The highest power density of 9.62 W/m² and energy conversion efficiency of 63.2% are achieved using saline water and rhombic pattern surface modified PTFE at contact frequency of 0.1 Hz, representing 8 fold improvement compared to the reported water tank based triboelectric nanogenerator based on fluorinated ethylene propylene. The results demonstrate that the nanogenerator has promising potential in scavenging water kinetic energy.

制造了一种基于聚四氟乙烯（PTFE）的水箱摩擦电纳米发电机，用于收集水波能量。为了确定最佳接触频率和负载条件，以最大化功率密度和能量转换，研究了接触频率在包括海浪频率范围和不同电阻性和电容性负载下的输出特性在内的广泛频率范围内的影响，以确定最佳接触频率和负载条件效率。另外，为了减少电荷筛选，对具有不同图案的PTFE进行了表面改性以增强其疏水性。此外，还研究了接触频率对表面改性PTFE的输出特性的影响。可以看到，随着接触频率的增加，开路电压和短路电流呈现相反的趋势。最高功率密度为9.62 W / m使用盐水和菱形图案表面改性的PTFE在接触频率为0.1 Hz时，能量转换效率达到²，能量转换效率为63.2％，与已报道的基于氟化乙烯丙烯的水槽摩擦纳米发电机相比，改进了8倍。结果表明，纳米发电机在清除水动能方面具有广阔的发展前景。