He Wencong, Liu Wenlin, Fu Shaoke, Wu Huiyuan, Shan Chuncai, Wang Zhao, Xi Yi, Wang Xue, Guo Hengyu, Liu Hong, Hu Chenguo
School of Physics, State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China.
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
Research (Wash D C). 2022 Jul 5;2022:9812865. doi: 10.34133/2022/9812865. eCollection 2022.
Triboelectric nanogenerator (TENG) is a promising strategy for harvesting low frequency mechanical energy. However, the bottlenecks of limited electric output by air/dielectric breakdown and poor durability by material abrasion seriously restrict its further improvement. Herein, we propose a liquid lubrication promoted sliding mode TENG to address both issues. Liquid lubrication greatly reduces interface material abrasion, and its high breakdown strength and charge transmission effect further enhance device charge density. Besides, the potential decentralization design by the voltage balance bar effectively suppresses the dielectric breakdown. In this way, the average power density up to 87.26 W·m·Hz, energy conversion efficiency of 48%, and retention output of 90% after 500,000 operation cycles are achieved, which is the highest average power density and durability currently. Finally, a cell phone is charged to turn on by a palm-sized TENG device at 2 Hz within 25 s. This work has a significance for the commercialization of TENG-based self-powered systems.
摩擦纳米发电机（TENG）是一种很有前景的收集低频机械能的策略。然而，空气/电介质击穿导致的有限电输出以及材料磨损造成的耐久性差等瓶颈严重限制了其进一步改进。在此，我们提出一种液体润滑促进的滑动模式TENG来解决这两个问题。液体润滑极大地减少了界面材料磨损，其高击穿强度和电荷传输效应进一步提高了器件的电荷密度。此外，通过电压平衡棒进行的潜在分散式设计有效地抑制了电介质击穿。通过这种方式，实现了高达87.26 W·m·Hz的平均功率密度、48%的能量转换效率以及500,000次运行循环后90%的保留输出，这是目前最高的平均功率密度和耐久性。最后，一个手掌大小的TENG装置在25秒内以2赫兹的频率为一部手机充电使其开机。这项工作对基于TENG的自供电系统的商业化具有重要意义。
