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Double-induced-mode integrated triboelectric nanogenerator based on spring steel to maximize space utilization

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Nano Research 2016年第11期9卷 3355-3363页

作者： Guanlin Liu Hengyu Guo Lin Chen Xue Wang Dapeng Wei chenguo hu Department of Applied Physics Chongqing University Chongqing 400044 China Chongqing Engineering Research Center of Graphene Film Manufacturing Chongqing 401329 China

Integrated multilayered triboelectric nanogenerators （TENGs） are an efficient approach to solve the insufficient energy problem caused by a single-layered TENG for achieving high output power density. However, most integrated multilayered TENGs have a relatively large volume. Here, a double-induced-mode integrated triboelectric nanogenerator （DI-TENG） based on spring steel plates is presented as a cost-effective, simple, and high-performance device for ambient vibration energy harvesting. The unique stackable rhombus structure, in which spring steel plates act both as skeletons and as electrodes, can enhance the output performance and maximize space utilization. The DI-TENG with five repeated units in a volume of 12 cm × 5 cm × 0.4 cm can generate a short-circuit current of 51 μA and can transfer charges of 1.25 μC in a half period. The contrast experiment is conducted systematically and the results have proved that the DI-TENG has a great advantage over the single-induced-mode TENG （SI-TENG） with only one side of a friction layer on its electrode. Besides, the DI-TENG can easily power a commercial calculator and can be used as a door switch sensor.

关键词： triboelectric nanogenerator double-induced-mode spring steelstackable rhombus structure

A flutter-effect-based triboelectric nanogenerator for breeze energy collection from arbitrary directions and self-powered wind speed sensor

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Nano Research 2019年第12期12卷 3018-3023页

作者： Jie hu Xianjie Pu Hongmei Yang Qixuan Zeng Qian Tang Dazhi Zhang chenguo hu Yi Xi Department of Applied Physics State Key Laboratory of Power Transmission Equipment&System Security and New TechnologyChongqing UniversityChongqing 400044China

Triboelectric nanogenerators(TENGs)have been developed rapidly into an efficient wind energy collection *** the frictionwear and energy loss in breeze energy collection is a research direction worthy of ***,a flutter-effect-based triboelectricnanogen erator(FE-TENG)is designed to collect the breeze energy at low wind speed from arbitrary *** from previouswind-driven TENGs,the wind-driven part of this device is separated from the TENG units,which not only avoids the wear of friction layerscaused by direct wind contact but also reduces the energy loss,therefore,relatively stable electric outputs are obtained with Voc-281 V,Isc-13.4μA,Qsc-143 nC,and output power-4 mW at the wind speed of 4.5 m/s,*** addition,a real-time wind speed monitoringsystem based on LabVIEW software with high sen sitivity and fast response to wind is achieved relying on the excellent linear relation shipbetween wind speed and electrical output ***,it has been successfully applied as power sources for portable electronics,about 170 commercial light-emitting devices(LEDs)are lighted and a digital watch is successfully driven at the wind speed of 2.9 m/*** worknot only provides a new structure and idea for the future collection of clean and sustainable breeze energy from arbitrary directions but also hasgreat potential in the field of self-powered systems.

关键词： flutter effect triboelectric nanogenerator arbitrary directions wind speed sensor

Triboelectric nanogenerator based on magnetically induced retractable spring steel tapes for efficient energy harvesting of large amplitude motion

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Nano Research 2018年第2期11卷 633-641页

作者： Guanlin Liu Jie Chen Hengyu Guo Meihui Lai Xianjie Pu Xue Wang chenguo hu Department of Applied Physics Chongqing University Chongqing China

The triboelectric nanogenerator has attracted global attention since it was proposed in 2012; the exploration of new applications is ongoing with much enthusiasm in this field. In this paper, we present a novel triboelectric nanogenerator based on magnetically induced retractable spring steel tapes （MR-TENG） to develop energy harvesing from large amplitude periodic motion, which is an ingenious design that employs a new material. The tape-like structural design ensures that the contact/separate direction of the friction layers is perpendicular to the direction of the external force, breaking the amplitude limitation of previous nanogenerators with vertical contact/separate motion. Combined with flexible spring steel tapes, this design enables portability thus widening its application. The working mechanism and factors that may affect the output performance are systematically studied. The results show that the maximum short-circuit current, open-circuit voltage and instantaneous power are 21 btA, 342 V, and 1.8 mW, respectively. Moreover, we also demonstrate the great potential of the MR-TENG to serve as a self-powered displacement sensor and portable emergency power supply. This work greatly widens the applications of triboelectric nanogenerators （TENGs） through new material selection and innovative structural design.

关键词： triboelectric nanogenerator(TENG) tape-like structure self-powered displacement sensor

Flexible and transparent triboelectric nanogenerator based on high performance well-ordered porous PDMS dielectric film

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Nano Research 2016年第12期9卷 3714-3724页

作者： Xianming He Xiaojing Mu Quan Wen Zhiyu Wen Jun Yang chenguo hu Haofei Shi Department of Applied Physics Chongqing University Chongqing 400044 China Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University Chongqing 400044 China Microsystem Research Center Chongqing University Chongqing 400044 China Key Laboratory of Multi-Scale Manufacturing Technology Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China

A flexible and transparent triboelectric nanogenerator （FT-TENG） has great potential for application in self-powered biosensor systems, electronic skin and wearable electronic devices. However, improving the output performance with little damage to its optical properties is challenging. Herein, we have developed an FT-TENG that has a well-ordered nest-like porous polydimethylsiloxane （NP-PDMS） film and graphene transparent electrodes. The NP-PDMS film with ordered pores is fabricated by hydrochloric acid etching of 500 nm sized ZnO spheres made of aggregated nanoparticles, having a light transmittance of 81.8% and a water contact angle of 118.62°. The FT-TENG based on the NP-PDMS film with a porosity of 12%, gives a maximum output of 271 V and 7.8 μA, which are respectively, 3.7 and 2.1-fold of those of a TENG with a flat PDMS film. The peak output power reaches 0.39 mW with a load resistance of 9.01 MΩ. The dielectric constant and effective thickness of the NP-PDMS film and the capacitance and charge transfer of the FT-TENG are systematically investigated. This work provides a novel and effective method to enhance the performance of FT-TENGs with little damage to their optical properties.

关键词： porouspolydimethylsiloxane(PDMS) surface charge density nanogenerator flexibility transparent electrode

Chain-flip plate triboelectric nanogenerator arranged longitudinally under water for harvesting water wave energy

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Nano Research 2023年第9期16卷 11900-11906页

作者： Yan Du Qian Tang Shaoke Fu Chuncai Shan Qixuan Zeng Hengyu Guo chenguo hu Department of Applied Physics Chongqing UniversityChongqing 400044China

Triboelectric nanogenerator(TENG)is a new cost-effective blue energy harvesting technology for its great performance in low ***,many related energy harvesters operate on water surface,ignoring the ocean’s ***,a chainflipped plate TENG(CFP-TENG),consisting of longitudinally arranged repeating units,is proposed to collect wave *** chain structure design allows the surface wave energy to act effectively on the underwater *** maximum output power per unit ocean area reaches 1.5 W·m^(-2) at a loading resistance of 30 MΩ.Optimization of device parameters and application demonstrations are *** with previous works,the utilization rate of wave energy has been significantly *** work not only provides a new method to optimize the output of TENG but also makes a crucial step in promoting practical applications of TENG in renewable blue energy.

关键词： triboelectric nanogenerator chain-flip plate wave energy blue energy

Room-Temperature Magnetism of Ceria Nanocubes by Inductively Transferring Electrons to Ce Atoms from Nearby Oxygen Vacancy

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Nano-Micro Letters 2016年第1期8卷 13-19页

作者： Yue Kang Qiang Leng Donglin Guo Dezhi Yang Yanping Pu chenguo hu Department of Applied Physics Chongqing University School of Public Affairs Chongqing University

Ceria(CeO_2) nanocubes were synthesized by a hydrothermal method and weak ferromagnetism was observed in room temperature. After ultraviolet irradiation, the saturation magnetization was significantly enhanced from*3.18×10^(-3) to *1.89×10^(-2) emug^(-1). This is due to the increase of oxygen vacancies in CeO_2 structure which was confirmed by X-ray photoelectron spectra. The first-principle calculation with Vienna ab-initio simulation package was used to illustrate the enhanced ferromagnetism mechanism after calculating the density of states(DOSs) and partial density of states(PDOSs) of CeO_2 without and with different oxygen vacancies. It was found that the increase of oxygen vacancies will enlarge the PDOSs of Ce 4f orbital and DOSs. Two electrons in one oxygen vacancy are respectively excited to 4f orbital of two Ce atoms neighboring the vacancy, making these electron spin directions on 4f orbitals of these two Ce atoms parallel. This superexchange interaction leads to the formation of ferromagnetism in CeO_2 at room temperature. Our work indicates that ultraviolet irradiation is an effective method to enhance the magnetism of CeO_2 nanocube, and the firstprinciple calculation can understand well the enhanced magnetism.

关键词： UV irradiation Oxygen vacancies Saturation magnetism Spin direction Superexchange interaction

Anti-Overturning Fully Symmetrical Triboelectric Nanogenerator Based on an Elliptic Cylindrical Structure for All-Weather Blue Energy Harvesting

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Nano-Micro Letters 2022年第7期14卷 342-353页

作者： Dujuan Tan Qixuan Zeng Xue Wang Songlei Yuan Yanlin Luo Xiaofang Zhang Liming Tan chenguo hu Guanlin Liu Department of Applied Physics State Key Laboratory of Power Transmission Equipment&System Security and New TechnologyChongqing UniversityChongqing 400044People’s Republic of China Center On Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanningGuangxi 530004People’s Republic of China

Triboelectric nanogenerators(TENGs) have shown promising potential for large-scale blue energy harvesting. However, the lack of reasonable designs has largely hindered TENG from harvesting energy from both rough and tranquil seas. Herein, a fully symmetrical triboelectric nanogenerator based on an elliptical cylindrical structure(EC-TENG) is proposed for all-weather blue energy harvesting. The novel elliptical cylindrical shell provides a unique selfstability, high sensitivity to wave triggering, and most importantly, an anti-overturning capability for the EC-TENG. Moreover, benefiting from its internal symmetrical design, the EC-TENG can produce energy normally, even if it was overturned under a rude oscillation in the rough seas, which distinguishes this work from previous reported TENGs. The working mechanism and output performance are systematically studied. The as-fabricated EC-TENG is capable of lighting 400 light-emitting diodes and driving small electronics. More than that, an automatic monitoring system powered by the EC-TENG can also monitor the water level in real-time and provide an alarm if necessary. This work presents an innovative and reliable approach toward all-weather wave energy harvesting in actual marine environments.

关键词： Anti-overturning Fully symmetrical Elliptic cylindrical Triboelectric nanogenerator Wave energy

Embedding variable micro-capacitors polydimethylsiloxane for enhancing output of triboelectric nanogenerator in power

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Nano Research 2017年第1期10卷 320-330页

作者： Xiaona Xia Jie Chen Hengyu Guo Guanlin Liu Dapeng Wei Yi Xi Xue Wang chenguo hu Department of Applied Physics Chongqing University Chongqing 400044 China Chongqing Key Laboratory of Multi-scale Manufacturing Technology Chongqing Institute of Green and Intelligent Technology Chinese Academy of 5ciences Chongqing 400714 China

Polydimethylsiloxane （PDMS） is an excellent material for investigating the mechanism of triboelectricity as it can easily be used to construct various microstructures. In this study, micro-capacitors （MCs） and variable microcapacitors （VMCs） were embedded in PDMS by filling PDMS with silver nanoparticles （NPs） and constructing an internal cellular structure. The output performance of the triboelectric nanogenerators （TENGs） based on MCs@PDMS and VMCs@PDMS films was systematically investigated, with variation of the filling content of silver NPs and the pore ratio and size. The microstructure, permittivity, dielectric loss, and capacitance of the VMCs@PDMS films were well characterized. The output current of the TENG based on the VMCs@PDMS film was respectively 4.0 and 1.6 times higher than that of the TENGs based on the pure PDMS film and MCs@PDMS film, and the output power density of the former reached 6 W·m-2. This study sheds light on the physical nature of conductive nanoparticle fillings and cellular structures in dielectric triboelectric polymers.

关键词： cellular structure polydimethylsiloxane silver nanoparticles variable micro-capacitor

An Ultra‑Durable Windmill‑Like Hybrid Nanogenerator for Steady and Efficient Harvesting of Low‑Speed Wind Energy

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Nano-Micro Letters 2020年第12期12卷 228-238页

作者： Ying Zhang Qixuan Zeng Yan Wu Jun Wu Songlei Yuan Dujuan Tan chenguo hu Xue Wang Department of Applied Physics State Key Laboratory of Power Transmission Equipment and System Security and New TechnologyChongqing UniversityChongqing 400044People’s Republic of China Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials Chongqing UniversityChongqing 400044People’s Republic of China

Wind energy is one of the most promising and renewable energy sources;however,owing to the limitations of device structures,collecting low-speed wind energy by triboelectric nanogenerators(TENGs)is still a huge *** solve this problem,an ultra-durable and highly efficient windmill-like hybrid nanogenerator(W-HNG)is ***,the W-HNG composes coupled TENG and electromagnetic generator(EMG)and adopts a rotational contact-separation *** unique design efficiently avoids the wear of friction materials and ensures a prolonged service ***,the generator group is separated from the wind-driven part,which successfully prevents rotation resistance induced by the friction between rotor and stator in the conventional structures,and realizes low-speed wind energy ***,the output characteristics of TENG can be complementary to the different performance advantages of EMG to achieve a satisfactory power *** device is successfully driven when the wind speed is 1.8 m s−1,and the output power of TENG and EMG can achieve 0.95 and 3.7 mW,*** power management,the W-HNG has been successfully applied as a power source for electronic *** work provides a simple,reliable,and durable device for improved performance toward large-scale low-speed breeze energy harvesting.

关键词： Triboelectric nanogenerator Windmill-like structure Rotational contact-separation mode Low-speed wind energy harvesting