Enhancing the current density of a piezoelectric nanogenerator using a three-dimensional intercalation electrode

Gu, Long; Liu, Jinmei; Cui, Nuanyang; Xu, Qi; Du, Tao; Zhang, Lu; Wang, Zheng; Long, Changbai; Qin, Yong

doi:10.1038/s41467-020-14846-4

Cited by 203 publications

(97 citation statements)

References 35 publications

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“…The current generated from individual falling droplets on these three samples (R L = 1.45 MΩ) is shown in Figure 4c. The current peaks are very similar because the effect of increasing σ for thinner samples is largely compensated by the increasing capacitance [11,15,[36][37][38][39][40][41][42] e) Current generated from single falling droplet using CTEG with samples T1, T2, and T3. The loading resistance is 1.45 MΩ.…”

mentioning

confidence: 99%

Charge Trapping‐Based Electricity Generator (CTEG): An Ultrarobust and High Efficiency Nanogenerator for Energy Harvesting from Water Droplets

et al. 2020

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and droplet-based electricity generator (DEG). [9] However, inherent flaws exist in current approaches. Reverse electrowetting energy harvesting devices always need external voltages. [1] Triboelectric nanogenerator (TENG), [10,11] which was first invented in 2012 by Wang and coworkers, [12,13] has provided a passive energy harvesting approach. But the performance of TENG is limited by the low density and poor stability of surface charges on tribo-layers. High surface charge density could only be achieved in vacuum environment [14] or by utilizing external pumping or excitation sources. [11,15] The droplet energy harvesting efficiency of the conventional TENG was only 0.01%. [5] Recently, Z. K. Wang and coworkers have reported a water dropbased electric generator, DEG, [9] showing significantly enhanced energy harvesting efficiency to 2.2%. Nevertheless, the energy harvesting efficiency of DEG is still limited by the density and stability of charges generated by triboelectrification during drop impact. The maximum surface charge density of DEG displayed around 0.184 mC m −2 (49.8 nC for 2.7 cm 2). [9] The surface charges in DEG were superior stability compared to the conventional TENG, although the charge density still degraded in a harsh environment with 100% humidity. Moreover, the efficiency greatly dropped with increasing salt Strategies toward harvesting energy from water movements are proposed in recent years. Reverse electrowetting allows high efficiency energy generation, but requires external electric field. Triboelectric nanogenerators, as passive energy harvesting devices, are limited by the unstable and low density of tribo-charges. Here, a charge trapping-based electricity generator (CTEG) is proposed for passive energy harvesting from water droplets with high efficiency. The hydrophobic fluoropolymer films utilized in CTEG are pre-charged by a homogeneous electrowetting-assisted charge injection (h-EWCI) method, allowing an ultrahigh negative charge density of 1.8 mC m −2. By utilizing a dedicated designed circuit to connect the bottom electrode and top electrode of a Pt wire, instantaneous currents beyond 2 mA, power density above 160 W m −2 , and energy harvesting efficiency over 11% are achieved from continuously falling water droplets. CTEG devices show excellent robustness for energy harvesting from water drops, without appreciable degradation for intermittent testing during 100 days. These results exceed previously reported values by far. The approach is not only applicable for energy harvesting from water droplets or wave-like oscillatory fluid motion, but also opens up avenues toward other applications requiring passive electric responses, such as diverse sensors and wearable devices.

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confidence: 99%

Charge Trapping‐Based Electricity Generator (CTEG): An Ultrarobust and High Efficiency Nanogenerator for Energy Harvesting from Water Droplets

et al. 2020

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“…Energy harvesting from the ambient vibration in different environments is an active line of research. Conversion of the vibration energy to electricity is mainly achievable through three popular methods namely electromagnetic [14][15][16] , triboelectric [17][18][19] and piezoelectric [20][21][22][23] . Piezoelectric elements have been widely utilized in vibration energy harvesting so far [24][25][26] , however, the low power and low efficiency of the PZT based energy harvesters is still a main challenge.…”

Section: Results Of This Study Can Open a New Path To Application Of mentioning

confidence: 99%

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Eghbali

Younesian

Moayedizadeh

et al. 2020

Sci Rep

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Piezoelectric (PZT) components are one of the most popular elements in vibration sensing and also energy harvesting. They are very well established, cost effective and available in different geometries however there are still several challenges in their application particularly in vibration energy harvesting. They are normally narrow-band elements and work in high-frequency range. Their efficiency and power extraction density are also generally low compared with different electromagnetic techniques. Auxetic structures are proposed here to enhance efficiency of the piezoelectric circular patches in vibration energy harvesting. These kinds of patches namely PZT buzzers are inexpensive (less than 10 USD) elements and easily available. Two novel circular auxetic substrates are proposed to improve power extraction capacity of the conventional piezoelectric buzzers. Negative Poison’s ratio of the proposed meta-structure helps in efficiency enhancement. The concept is introduced, analyzed and verified through the finite element modeling and experimental testing. The idea is proved to work by comparing the harvested electrical power in the auxetic design against the conventional plain system. A parametric study is then carried out and effects of important electrical and geometrical parameters as well as the material property on the power extraction efficiency are assessed to arrive at optimum parameters. It is shown that by employing the auxetic design, a remarkable improvement in the harvested power is achievable. It is shown that for the two proposed auxetic designs, at the resonance frequency, we could reach to 10.2 and 13.3 magnification factor with respect to the plain energy harvester. Another important feature is that the resonant frequency in these new designs is very much lower than the conventional resonators. Results of this study can open a new path to application of inexpensive PZT buzzers in large-scale vibration energy harvesting.

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“…Reprinted from ref ( Cheng et al., 2020 ) with permission, Copyright©2020 WILEY-VCH Verlag GmbH & Co. (D) A PENG with novel three-dimensional intercalation electrode with improved current density. Reprinted from ref ( Gu et al., 2020 ) with permission, Copyright©2020 The Authors. (E) A flexible PENG based on monolayer 2D material SnS.…”

Section: Wearable Piezoelectric Nanogeneratorsmentioning

confidence: 99%

Section: Wearable Piezoelectric Nanogeneratorsmentioning

confidence: 99%

Flourishing energy harvesters for future body sensor network: from single to multiple energy sources

Guo

Lee

2021

iScience

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Summary Body sensor network (bodyNET) offers possibilities for future disease diagnosis, preventive health care, rehabilitation, and treatment. However, the eventual realization demands reliable and sustainable power sources. The flourishing energy harvesters (EHs) have provided prominent techniques for practically addressing the concurrent energy issue. Targeting for a specific energy source, wearable EHs with a sole conversion mechanism are well investigated. Hybrid EHs integrating different effects for a single source or multi-sources are attaining growing attention, for they provide another degree of freedom concerning a higher-level energy utility. Merging EHs with other functional electronics, diversified functional self-sustainable systems are developed, paving the way for the accomplishment of bodyNET. This review introduces the evolution of wearable EHs from a single effect to hybridized mechanisms for multiple energy sources and wearable to implantable self-sustainable systems. Last, we provide our perspectives on the future development of hybrid EHs to be more competitive with conventional batteries.

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Enhancing the current density of a piezoelectric nanogenerator using a three-dimensional intercalation electrode

Cited by 203 publications

References 35 publications

Charge Trapping‐Based Electricity Generator (CTEG): An Ultrarobust and High Efficiency Nanogenerator for Energy Harvesting from Water Droplets

Charge Trapping‐Based Electricity Generator (CTEG): An Ultrarobust and High Efficiency Nanogenerator for Energy Harvesting from Water Droplets

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Flourishing energy harvesters for future body sensor network: from single to multiple energy sources

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