Highly adaptive and broadband triboelectric energy harvester with stretching silicone rubber strip for variable harmonic frequency vibration

An enormous number of wireless sensing nodes(WSNs)are of great significance for the Internet of Things(IoT).It is tremendously prospective to realize the in-situ power supply of WSNs by harvesting unutilized mechanical vibration energy.A harmonic silicone rubber triboelectric nanogenerator(HSR-TENG)is developed focusing on ubiquitous constant working frequency machinery.The unique design of the strip serving as a flexible resonator realizes both soft contact and high and broadband output.The significant factors influencing the 1^(st)-order vibration mode of the strip are developed for realizing the harmonic frequency adaptation to external vibration.The surface treatment of the strip improves the output performance of HSR-TENG by 49.1%as well as eliminates the adhesion effect.The HSR-TENG is able to achieve a voltage output bandwidth of 19 Hz under a vibration strength of 3.0,showing its broadband capability.The peak power density of 153.9 W/m^(3)is achieved and 12×0.5 W light-emitting diodes(LEDs)are successfully illuminated by the HSR-TENG.It can continuously power a temperature sensor by harvesting the actual compressor vibration energy.In brief,the HSR-TENG provides a promising way for constant frequency vibration energy harvesting,so as to achieve in-situ power supply for the WSNs in the vicinity.

Triboelectric Nanogenerator Enabled Smart Shoes for Wearable Electricity Generation

The parallel evolution of wearable electronics,artificial intelligence,and fifth-generation wireless technology has created a technological paradigm with the potential to change our lives profoundly.Despite this,addressing limitations linked to continuous,sustainable,and pervasive powering of wearable electronics remains a bottleneck to overcome in order to maximize the exponential benefit that these technologies can bring once synergized.A recent groundbreaking discovery has demonstrated that by using the coupling effect of contact electrification and electrostatic induction,triboelectric nanogenerators(TENGs)can efficiently convert irregular and low-frequency passive biomechanical energy from body movements into electrical energy,providing an infinite and sustainable power source for wearable electronics.A number of human motions have been exploited to properly and efficiently harness this energy potential,including human ambulation.Shoes are an indispensable component of daily wearing and can be leveraged as an excellent platform to exploit such kinetic energy.In this article,the latest representative achievements of TENG-based smart electricity-generating shoes are comprehensively reviewed.We summarize ways in which not only can biomechanical energy be scavenged via ambulatory motion,but also biomonitoring of health parameters via tracking of rhythm and strength of pace can be implemented to aid in theranostic fields.This work provides a systematical review of the rational structural design,practical applications,scenario analysis,and performance evaluation of TENG-based smart shoes for wearable electricity generation.In addition,the perspective for future development of smart electricity-generation shoes as a sustainable and pervasive energy solution towards the upcoming era of the Internet of Things is discussed.