國立虎尾科技大學 |

Understanding Triboelectric Charge Generation and Discharge in Triboelectric Nanogenerator

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Understanding Triboelectric Charge Generation and Discharge in Triboelectric Nanogenerator/ Xin Xia.
作者:	Xia, Xin,
面頁冊數:	1 electronic resource (179 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
Contained By:	Dissertations Abstracts International84-05B.
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30190549
ISBN:	9798352942222

Understanding Triboelectric Charge Generation and Discharge in Triboelectric Nanogenerator
Xia, Xin,

Understanding Triboelectric Charge Generation and Discharge in Triboelectric Nanogenerator [eletronic resource] /Xin Xia. - 1 electronic resource (179 pages)

Source: Dissertations Abstracts International, Volume: 84-05, Section: B.

With the rapid development of Internet of Thing, energy from μW to TW is required to power widely distributed micro/nano systems, and thus triboelectric nanogenerators (TENG) were proposed in 2012 to harvest the tiny mechanical energy from environment. As a new energy harvesting technology based on triboelectrification and electrostatic induction, TENG suggests excellent potential in self-powered systems, where it can serve both as power source and functional sensors attributed to the high electrical output and sensitivity to tiny stimulations from environments. Thus, controlling the surface charge density that directly determines the output performance of TENG is necessary upon different requirements of applications. However, various factors affect the surface charge density lot, such as the relative humidity, atmosphere, gas pressure, temperature, and materials, mechanical input, etc. Those factors play an important role on the charge generation and charge dissipation processes, while the potential mechanisms of the two processes remain unclear. Therefore, the fundamentals of the triboelectrification and discharge processes of TENG and related applications are focused on in this thesis. The material-dependent contact electrification (CE) mechanism has been demonstrated, where electron transfer mechanism is dominant in metal/polymer pairs, but both electron transfer and material transfer mechanisms may coexist in polymer/polymer pairs. However, certain contribution ratios of each mechanism are unclear. Herein, a model was proposed to describe the contributions from different mechanisms in polymer/polymer CE through the field-assisted thermionic emission, where 3 groups were distinguished successfully. The results indicated that the total generated charge in CE is much larger than the measured net surface charge, confirming the bidirectional material-dependent charge transfer mechanisms between two surfaces. Beside the mechanisms for charge generation, the discharge effect was studied as well, where a standardized method is proposed for output capability assessment of nanogenerators considering the breakdown effect. The effective maximized energy output and revised figure-of-merits are calculated based on the experimental results. These results are consistent with that theoretically calculated based on Paschen's law. This method is also conducted to evaluate a film-based piezoelectric nanogenerator (PENG), demonstrating its universal applicability for nanogenerators. Considering the severe decay on the output by air breakdown, an inductor-free output multiplier (OM) for power promotion and management of TENGs is proposed, with the breakdown effect considered. This OM circuit was demonstrated to be suitable for power promotion and power management of TENGs with variable capacitance. It ensured the high output performance of TENGs even at a low triboelectric charge density. Additionally, to enhance the triboelectrification efficiency in solid/solid interfaces, metallic glass (MG) with disordered atomic structures was employed as the electrode of TENG, reflecting better output performance than metal because of the absence of grain boundaries and porous structures. The output performance of MG varies with different components, suggesting the humidity-resistant, wear-resistant capacity with high triboelectrification efficiency, which is essential to push the output limit of TENG.All in all, mechanisms for triboelectrification and discharge of TENG have been systematically studied in this thesis, which, as the author envisions, is meaningful to provide a deep understanding in controlling the surface charge density upon different requirements of applications. The OM circuit provided a way to realize the threshold output, and the utilization of MG demonstrated the CE manipulation through the aspect of charge generation, further pushing the limits based on the fundamental studies.

English

ISBN: 9798352942222Subjects--Topical Terms:

557493
Mechanical engineering.
Subjects--Index Terms:

Triboelectric nanogenerators (TENG)

Understanding Triboelectric Charge Generation and Discharge in Triboelectric Nanogenerator
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500 $a Advisors: Zhang, Li; Zi, Yunlong.
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520 # $a With the rapid development of Internet of Thing, energy from μW to TW is required to power widely distributed micro/nano systems, and thus triboelectric nanogenerators (TENG) were proposed in 2012 to harvest the tiny mechanical energy from environment. As a new energy harvesting technology based on triboelectrification and electrostatic induction, TENG suggests excellent potential in self-powered systems, where it can serve both as power source and functional sensors attributed to the high electrical output and sensitivity to tiny stimulations from environments. Thus, controlling the surface charge density that directly determines the output performance of TENG is necessary upon different requirements of applications. However, various factors affect the surface charge density lot, such as the relative humidity, atmosphere, gas pressure, temperature, and materials, mechanical input, etc. Those factors play an important role on the charge generation and charge dissipation processes, while the potential mechanisms of the two processes remain unclear. Therefore, the fundamentals of the triboelectrification and discharge processes of TENG and related applications are focused on in this thesis. The material-dependent contact electrification (CE) mechanism has been demonstrated, where electron transfer mechanism is dominant in metal/polymer pairs, but both electron transfer and material transfer mechanisms may coexist in polymer/polymer pairs. However, certain contribution ratios of each mechanism are unclear. Herein, a model was proposed to describe the contributions from different mechanisms in polymer/polymer CE through the field-assisted thermionic emission, where 3 groups were distinguished successfully. The results indicated that the total generated charge in CE is much larger than the measured net surface charge, confirming the bidirectional material-dependent charge transfer mechanisms between two surfaces. Beside the mechanisms for charge generation, the discharge effect was studied as well, where a standardized method is proposed for output capability assessment of nanogenerators considering the breakdown effect. The effective maximized energy output and revised figure-of-merits are calculated based on the experimental results. These results are consistent with that theoretically calculated based on Paschen's law. This method is also conducted to evaluate a film-based piezoelectric nanogenerator (PENG), demonstrating its universal applicability for nanogenerators. Considering the severe decay on the output by air breakdown, an inductor-free output multiplier (OM) for power promotion and management of TENGs is proposed, with the breakdown effect considered. This OM circuit was demonstrated to be suitable for power promotion and power management of TENGs with variable capacitance. It ensured the high output performance of TENGs even at a low triboelectric charge density. Additionally, to enhance the triboelectrification efficiency in solid/solid interfaces, metallic glass (MG) with disordered atomic structures was employed as the electrode of TENG, reflecting better output performance than metal because of the absence of grain boundaries and porous structures. The output performance of MG varies with different components, suggesting the humidity-resistant, wear-resistant capacity with high triboelectrification efficiency, which is essential to push the output limit of TENG.All in all, mechanisms for triboelectrification and discharge of TENG have been systematically studied in this thesis, which, as the author envisions, is meaningful to provide a deep understanding in controlling the surface charge density upon different requirements of applications. The OM circuit provided a way to realize the threshold output, and the utilization of MG demonstrated the CE manipulation through the aspect of charge generation, further pushing the limits based on the fundamental studies.
520 3 $a 隨著物聯網的快速發展，需要從μW到TW的能量來為廣泛分佈的微/納米系統供電，因此，用於從環境中獲取微小機械能的摩擦納米發電機（TENG）在2012年被提出。作為一種基於摩擦起電和靜電感應的新型能量收集技術，TENG在自供電系統中顯示出巨大的潛力。歸因於高電輸出和對實驗中微小刺激的敏感性，它可以作為電源和功能傳感器。因此，根據不同的應用需求，需要控制直接決定TENG輸出性能的表面電荷密度。然而，影響表面電荷密度的因素很多，如相對濕度、氣體成分、氣壓、溫度、材料、機械輸入等。這些因素對電荷產生和電荷耗散過程起重要作用，然而兩個過程的潛在機制仍不清楚。因此，本文重點研究了TENG的起電和放電的基本原理及相關應用。證明了取決於材料的接觸起電（CE）機制，其中電子轉移機制在金屬/聚合物對中占主導地位，但電子轉移和材料轉移機制可能在聚合物/聚合物對中共存。然而，每種機制的貢獻率尚不清楚。因此，本文通過電場輔助熱離子發射提出了一個模型來描述聚合物/聚合物CE中不同機制的貢獻，成功區分了3組機製。結果表明，CE中實際產生的總電荷遠大於測量的淨表面電荷，證實了兩個表面之間的取決於材料的雙向電荷轉移機制。除了電荷產生機制之外，本文也對放電過程進行了研究，提出了一種考慮擊穿效應的納米發電機輸出能力評估的標準化方法，並根據實驗結果計算出有效的最大能量輸出和修正的品質因數。這些結果與基於Paschen定律的理論計算結果一致。該方法還用於評估基於薄膜的壓電納米發電機，證明了其對納米發電機的普遍適用性。考慮到空氣擊穿對輸出的嚴重衰減，在考慮擊穿效應的情況下，本文还提出了一種用於TENG功率提升和管理的無電感輸出倍增器(OM)。該OM電路適用於具有可變電容的TENG的功率提升和功率管理。即使在低表面電荷密度下，它也確保了TENG的高輸出性能。此外，為了提高固體/固體介面的摩擦效率，具有無序原子結構的金屬玻璃（MG）被用作TENG的電極。由於沒有晶界和多孔結構，它比金屬具有更好的輸出性能。MG的輸出性能因組分的不同而不同。在高摩擦效率下,它呈現了耐濕、耐磨能力，這對於推動TENG的輸出極限至關重要。總而言之，本文系統地研究了TENG的起電和放電機制，作者認為，這對於根據不同應用要求控製表面電荷密度具有重要意義。值輸出的方法，MG的利用則從電荷產生方面展示了OM對電路提供了一種實現閾CE 的操縱，進一步突破了基礎研究的極限。.
546 $a English
590 $a School code: 1307
650 # 4 $a Mechanical engineering. $3 557493
650 # 4 $a Automotive engineering. $3 1104081
653 # # $a Triboelectric nanogenerators (TENG)
653 # # $a Mechanical energy
653 # # $a Electrostatic induction
690 $a 0548
690 $a 0540
710 2 # $a The Chinese University of Hong Kong (Hong Kong). $3 1180404
720 1 $a Zhang, Li $e degree supervisor.
720 1 $a Zi, Yunlong $e degree supervisor.
773 0 # $t Dissertations Abstracts International $g 84-05B.
790 $a 1307
791 $a Ph.D.
792 $a 2022
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