Figure 1 - Scheme of DDC-TENG
Figure 2 - Power Management in DDC-TENG
As awareness of Hong Kong's energy crisis grows, renewable green energy is being proposed as a promising solution for the government. Among all types of energy, Hong Kong is rich in water resources. At the same time, Hong Kong is located in southern Asia and is a rainy city. If the energy of raindrops can be harvested when it rains, it will better solve the energy problem.
As a new power generation equipment proposed in 2012, the Triboelectric Nanogenerator (TENG) has the advantages of small size and portability. TENG can collect energy in various scenarios in life. The principle of TENG is to transfer charges to generate electrical energy through periodic contact separation or sliding of materials with different friction coefficients, so it usually behaves as an alternating current. During use, it is usually necessary to connect a rectifier to directly power the device. This greatly increases the inconvenience of portable devices. Inspired by the lightning phenomenon, a droplet-based direct current triboelectric nanogenerator (DDC-TENG) was designed that does not require any rectifier. This DDC-TENG utilizes the electrostatic potential generated between water droplets and the triboelectric layer, based on the dielectric breakdown mechanism, to directly charge the capacitor by forming a small gap between the triboelectric layer and the electrode, without the need for a rectifier.
Figure 1 - Scheme of DDC-TENG
Figure 2 - Power Management in DDC-TENG
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隨著香港能源危機意識的增強，再生綠色能源被提出作為政府的一個有前途的解決方案。在所有類型的能源中，由於香港水資源豐富，同時，香港位於亞洲南部，是一個多雨的城市。如果在下雨時可以收集雨滴的能量，那將更好地解決能源問題。
作為2012年提出的新型發電設備，摩擦奈米發電機(TENG)具有體積小、可攜帶的優點。TENG可以在生活中的各種場景中收集能量。TENG的原理是透過不同摩擦係數的材料的週期性接觸分離或滑動來轉移電荷產生電能，因此它通常表現為交流電。在使用過程中，通常需要連接整流器來直接為設備供電。這大大增加了便攜設備的不便之處。受閃電現象的啟發，我們設計了一種基於液滴的直流摩擦電奈米發電機(DDC-TENG)，不需要任何整流器。這種DDC-TENG利用水滴和摩擦電層之間產生的靜電勢，基於介電擊穿機理，透過在摩擦電層和電極之間形成小間隙直接為電容器充電，而不需要整流器。
圖 1 - DDC-TENG 示意圖
圖 2 - DDC-TENG 的能源管理系統
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