High‐Performance Dielectric Elastomer Nanogenerator for Efficient Energy Harvesting and Sensing via Alternative Current Method (Adv. Sci. 18/2022)

Abstract

High‐Performance Dielectric Elastomer Nanogenerators In article number 2201098 by Shiju E, Kang Liu, Zhong Lin Wang, and co‐workers, a freestanding stretchable generator (100 μm thick) with high output performance is reported. To get rid of the limit of external power supplies, the authors use the electret electrostatic voltage source (EEVS), the pump circuit, and dielectric elastomer capacitor to construct a dielectric elastomer generator based on alternative current method (AC‐DEG). The AC‐DEG shows high charge density and high energy density and can reaches the same output performance as the traditional DEG with external power supply of several kilovoltages.

Largely enhanced energy harvesting performances of DEGs by constructing all-organic dielectric composites with a soft and deformable filler

“…In the quest for sustainable and renewable energy sources, researchers and engineers have been exploring innovative technologies to harvest energy from various environmental sources. 1 Among these technologies, the dielectric elastomer generator (DEG) has emerged as a particularly prominent one. DEGs hold great promise as they enable the harvesting of renewable energy from various low-frequency natural movements in nature, including wave energy and human body motion (see Scheme 1(a)).…”

“…The two key parameters, energy density (w) and power conversion efficiency (PCE), which represent the essential energy harvesting performance of DEGs, can be determined by dividing the generated energy in a cycle (DE) by the mass of the DEG material and the input mechanical energy (W mech ), respectively. According to our previous study, 6,7 w can be described as eqn (1):…”

A primary–secondary triboelectric nanogenerator with charge excitation shift in a wind-driven alternating operating mode

“…39 Wang et al used charge excitation to harvest energy from a greenhouse, 40 and Xu et al applied the method to harvest energy from water waves. 41 As the research efforts above show, many designs have been explored based on the use of the charge excitation method. However, the pump TENG and the main TENG always work together, which increases the rotary torque required.…”