A facile frequency tuning strategy to realize vibration‐based hybridized piezoelectric‐triboelectric nanogenerators

Abstract

With increasing requirements of the Internet of things (IoT) functioning with wireless sensor networks (WSN), a self-sustainable power supply has become an important pursuit in long-term working. The cantilever-based energy harvester is one of the most widely used devices for converting vibrations into electrical energy, while still challenged by restricted frequency bands toward practical applications. Here, a novel, feasible and cost-effective strategy for tuning the cantilever's resonant frequency is proposed. By applying 3D printed thin sheets as extensions, the original single vibration mode is promoted into two relatively independent vibration modes tuned with extensions' type, length, thickness, and proof masses.Hybridized piezoelectric-triboelectric nanogenerators are introduced to improve capacitor charging ability and potential vibration detection. Furthermore, a fourcantilever coupling design with different tuning parameters is investigated and enables wireless demonstrations of monitoring environmental temperature/ humidity and carbon dioxide concentration, which is prospective as selfsustainable protection for workers in tunnels or underground constructions.

Nano-electro-mechanical conduct of boron nitride nanotube as piezoelectric nanogenerators and nanoswitches

“…Moreover, these nanogenerators enable the miniaturization of electric generators to the nanometer scale, which is crucial for advancements in nanotechnology and nanoelectronics [9]. However, piezoelectric nanogenerator vibration frequency bands [12] and their setups [13][14][15] are still the principal challenges in converting mechanical vibrations into electricity. In the domain of nanogenerator applications, various designs such as cantilever and circular membrane piezoelectric electrical generators have been well-documented [80].…”

“…Piezoelectric nanogenerators have emerged as promising candidates in this regard [10,11]. However, challenges persist in terms of optimizing the frequency bands [12] and setups [13][14][15] of these nanogenerators to efficiently convert mechanical vibrations into electricity.…”

Mechanical Vibration Energy Harvesting and Vibration Monitoring Based on Triboelectric Nanogenerators

“…Due to the multiple resonant frequencies in the low‐frequency range and the nonlinear behavior of the contact shock, the operating bandwidth of this structure can be broadened. When it is practically applied to the vibration energy harvesting of vacuum compression pump, the obtained maximum peak voltage from the main TENG of the device was more than 8 V. Liu et al [ 117 ] proposed a hybridized piezoelectric‐TENG with a feasible and cost‐effective strategy for tuning the cantilever's resonant frequency, whose structure is shown in Figure 6b below. It is mainly consisting of a base PZT piezoelectric sheet and two 3D‐printed sheets pasted under it and a mass block to increase the amplitude.…”

Intelligent Cubic-Designed Piezoelectric Node (iCUPE) with Simultaneous Sensing and Energy Harvesting Ability toward Self-Sustained Artificial Intelligence of Things (AIoT)

“…To overcome this challenge, i . e ., being able to operate in broad bandwidth, a number of solutions have been proposed, including multiple PEGs cantilever array, frequency tunning or multiple vibration modes, − and nonlinear mechanisms. − Furthermore, the second challenge of using the miniaturized energy harvester as the useful power supply to realize the self-sustained IoT sensor nodes is the deteriorated power generation during each vibration cycle at low resonant frequencies . For capturing vibration energy at low frequencies from a broadband environment and further boosting up the output power, a frequency up-conversion (FUC) strategy has been investigated, , which can convert low-frequency ambient vibration into high-frequency self-oscillation of PEG cantilevers via several mechanisms: mechanical plucking, , mechanical impact, and impulse-like magnetic force, to name a few.…”