Chung Jihoon, Heo Deokjae, Kim Banseok, Lee Sangmin
School of Mechanical Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.
Micromachines (Basel). 2018 Nov 13;9(11):593. doi: 10.3390/mi9110593.
Energy harvesting is a method of converting energy from ambient environment into useful electrical energy. Due to the increasing number of sensors and personal electronics, energy harvesting technologies from various sources are gaining attention. Among energy-harvesting technologies, triboelectric nanogenerator (TENG) was introduced as a device that can effectively generate electricity from mechanical motions by contact-electrification. Particularly, liquid-solid contact TENGs, which use the liquid itself as a triboelectric material, can overcome the inevitable friction wear between two solid materials. Using a commercial aerosol hydrophobic spray, liquid-solid contact TENGs, with a superhydrophobic surface (contact angle over 160°) can be easily fabricated with only a few coating processes. To optimize the fabrication process, the open-circuit voltage of sprayed superhydrophobic surfaces was measured depending on the number of coating processes. To demonstrate the simple fabrication and applicability of this technique on random 3D surfaces, a liquid-solid contact TENG was fabricated on the brim of a cap (its complicated surface structure is due to the knitted strings). This simple sprayed-on superhydrophobic surface can be a possible solution for liquid-solid contact TENGs to be mass produced and commercialized in the future.
能量收集是一种将环境中的能量转换为有用电能的方法。由于传感器和个人电子产品数量的不断增加，来自各种来源的能量收集技术正受到关注。在能量收集技术中，摩擦纳米发电机（TENG）作为一种能够通过接触起电从机械运动中有效发电的装置被引入。特别是，以液体本身作为摩擦电材料的液 - 固接触式TENG，可以克服两种固体材料之间不可避免的摩擦磨损。使用商用气溶胶疏水喷雾剂，只需经过几次涂覆工艺，就可以轻松制造出具有超疏水表面（接触角超过160°）的液 - 固接触式TENG。为了优化制造工艺，根据涂覆工艺的次数测量了喷涂超疏水表面的开路电压。为了证明该技术在随机三维表面上的简单制造和适用性，在帽檐上制造了一个液 - 固接触式TENG（其复杂的表面结构是由于编织绳造成的）。这种简单的喷涂超疏水表面可能是未来液 - 固接触式TENG大规模生产和商业化的一种可行解决方案。
