A Noncontact Constant-Voltage Triboelectric Nanogenerator via Charge Excitation

Abstract

Triboelectric nanogenerators (TENGs) have attracted great attention in the distributed power sources field due to their ability to convert environment mechanical energy into electrical energy. However, the power density, durability, and humidity resistance of TENGs remain to be improved for large-scale application. Here, a noncontact constant-voltage triboelectric nanogenerator via charge excitation (ECV-TENG) is proposed to enhance the output performance, which first applies an adaptive-contact constant-voltage TENG as a charge pump and generates constant-voltage output via an elaborate noncontact phase-shift design. The ECV-TENG achieves an average power of 12.74 W m −3 Hz −2 and exhibits a long service life of over 2,000,000 cycles. Moreover, thanks to the humidity resistance of the constant-voltage pump and noncontact TENG, the ECV-TENG demonstrates a good humidity resistance at humidity up to 90%. This work not only promotes the potential applications of TENGs as a distributed energy supply but also provides new insights toward large-scale energy harvesting by TENGs.

A Combined Wind Harvesting and Speed Sensing System Based on Constant‐Voltage Triboelectric Nanogenerator

“…Their average current is 0.18, 0.36, and 2.52 mA under a resistance of 1 kΩ, respectively, achieving a high current density of 28.7 mA m −2 (Figure 1d). And compared with conventional PV‐TENG and CV‐TENG based on phase‐shift design in wind energy harvesting, the average power density (APD) is greatly increased from 13.24 to 262 mW m −2 Hz −1 (Figure 1e; Table S1, Supporting Information), [ 6‐8,20,22‐26,35,36 ] which provides an important demonstration of the efficient wind energy collection.…”

“…Then various approaches were made to improve the output performance of CV‐TENG, including the soft triboelectric materials, [ 20‐24 ] rotational contact‐separation structure, [ 25 ] and non‐contact mode via charge excitation. [ 26 ] Recent research proposed the dynamic process of charge transfer under a capacitor load and efficient energy transport in CV‐TENG based power unit, which further promoted the development and advancement of CV‐TENG. [ 27 ] However, it remains a challenge to develop a convenient CV‐TENG for efficiently harvesting wind energy to enhance the energy output efficiency.…”

Efficient energy transport in constant-voltage triboelectric nanogenerator-based power units

“…To enhance the efficiency of this energy transport, investigators have dedicated efforts to separately solve the key issue of every node in the energy transport process. 7,9 In terms of energy conversion and electricity generation, boosting the surface charge density to the threshold can guarantee efficient energy conversion and electricity generation in energy transport. 10,11 The surface charge density determines the energy output, which can be increased to the threshold of existing conditions by material optimization, structure design, environmental control, charge pumping and charge excitation.…”

Boosting the Output of Liquid–Solid Triboelectric Nanogenerator by an External Charge‐Pumping Strategy

“…With the increasing depletion of traditional fossil fuel energy, the development and utilization of cleaner, [1,2] more efficient, and environmentally friendly energy [3] has become particularly through the bottleneck of charge density. [33][34][35][36][37] Generally, the charge-pumping mechanism is based on a floating conductive layer and it can be injected bound charges from a charge pump that is similar to the functioning of a TENG as a voltage source to charge another TENG acting as a capacitor, [35] which can enhance output performance. Charge-pumping strategy is currently widely used at solid-solid interfaces due to the fact that it relies on contact and separation between two different materials to achieve charge accumulation.…”