The ocean covers 70% of the earth’s surface and is one of the largest uncultivated resources still available for harvesting energy. The triboelectric energy harvesting technology has the potential to effectively convert the ocean’s “blue energy” into electricity. A half-cylinder structure including rollers floating on the water has already been used, in which the pendulum motion of the rollers is driven by the waveform. For the stable motion of the rollers, the printed surface of the device was treated with acetone for attaining hydrophilicity. The electrical outputs with the proposed device were enhanced by increasing the contact surface area by simply implementing the double roller structure with double side-covered electrodes. With the optimized structure, the maximum power density reached a value of 69.34 µW m⁻² at a load resistance of 200 MΩ with the device’s high output durability. Finally, the fabricated device was also applied to the artificial water waves to demonstrate the possibility of using this device in the ocean. By simply modifying the electrode structure and adding a roller, this device demonstrated the ability to generate over 160% of electrical output with the same covered area of the ocean by the triboelectric nanogenerators (TENGs) and potential ocean application.

中文翻译：

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用于蓝色能量收集的 3D 打印双辊摩擦纳米发电机

海洋覆盖了地球表面的 70%，是仍然可用于获取能量的最大未开发资源之一。摩擦电能收集技术具有将海洋的“蓝色能量”有效转化为电能的潜力。已经使用了包括漂浮在水面上的滚轮的半圆柱结构，其中滚轮的摆锤运动由波形驱动。为了辊的稳定运动，装置的印刷表面用丙酮处理以获得亲水性。通过简单地实施带有双侧覆盖电极的双辊结构来增加接触表面积，从而提高了所提出设备的电输出。采用优化结构，最大功率密度达到 69.34 µW m ^-2在 200 MΩ 的负载电阻下，该器件具有高输出耐用性。最后，制造的装置还应用于人造水波，以证明在海洋中使用该装置的可能性。通过简单地修改电极结构并添加一个滚轮，该设备展示了通过摩擦纳米发电机 (TENG) 和潜在的海洋应用在相同覆盖的海洋面积下产生超过 160% 的电力输出的能力。