Liang Ganggang, Zhao Daoli, Yan Zhimiao, Sun Weipeng, Wang Zhemin, Tan Ting
State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China.
State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Rev Sci Instrum. 2023 Nov 1;94(11). doi: 10.1063/5.0157421.
Harvesting vibration energy using a triboelectric nanogenerator (TENG) is a promising approach in solving the power supply restriction of the Internet of Things. Currently, the low durability due to friction surface wearing is the primary limitation of TENGs, which restricts their applicability and practicability. This study introduces a non-contact-type TENG aimed at significantly enhancing its durability by increasing its anti-wear capability. The configuration of the proposed TENG includes permanent magnets and rolling-balls. The reciprocating motion of functional friction surfaces, facilitated by the permanent magnets, enhances the efficiency of harvesting low-frequency vibration energy. The embedded rolling-balls are utilized to separate two functional friction surfaces, which minimizes the friction surface wearing between different dielectric materials. The electrical output characteristics of this non-contact TENG under variable load resistances are explored according to sinusoidal excitation based on either variable frequencies or accelerations. The results demonstrate that the proposed nanogenerator can generate a short-circuit current of 2118.2 nA and achieve a peak power density of 9.891 mW/m2. The electrical responses of this non-contact TENG remain stable over 120 000 continuous working cycles, lasting for more than 200 min. Furthermore, the nanogenerator can identify and harvest energy from running or jumping motions performed by individuals in different postures and at various speeds or heights. With its exceptional durability and stability, this non-contact nanogenerator offers a novel approach to low-frequency vibration energy harvesting, paving the way for practical applications in the field.
利用摩擦电纳米发电机（TENG）收集振动能量是解决物联网电源限制的一种有前途的方法。目前，由于摩擦表面磨损导致的低耐久性是TENG的主要限制，这限制了它们的适用性和实用性。本研究介绍了一种非接触式TENG，旨在通过提高其抗磨损能力来显著提高其耐久性。所提出的TENG的结构包括永磁体和滚珠。永磁体促进功能摩擦表面的往复运动，提高了收集低频振动能量的效率。嵌入式滚珠用于分离两个功能摩擦表面，从而最大限度地减少不同介电材料之间的摩擦表面磨损。根据基于可变频率或加速度的正弦激励，探索了这种非接触式TENG在可变负载电阻下的电输出特性。结果表明，所提出的纳米发电机可以产生2118.2 nA的短路电流，并实现9.891 mW/m2的峰值功率密度。这种非接触式TENG的电响应在120000个连续工作循环中保持稳定，持续超过200分钟。此外，该纳米发电机可以识别并从不同姿势、不同速度或高度的个人跑步或跳跃运动中收集能量。这种非接触式纳米发电机具有出色的耐久性和稳定性，为低频振动能量收集提供了一种新方法，为该领域的实际应用铺平了道路。
