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Science China(Information Sciences) 2022年第4期65卷 229-237页

作者： Jian HE Xueming FAN Dongyang ZHAO Min CUI Bing HAN Xiaojuan HOU Xiujian CHOU Science and Technology on Electronic Test and Measurement Laboratory North University of China College of Mechatronic Engineering North University of China Beijing Institute of Computer Application China North Industries Group Corporation Limited

Scavenging mechanical vibration energy by combining triboelectric nanogenerators(TENGs) and electromagnetic generators(EMGs) is a renewable and low-carbon way to generate electric power. In this paper, we fabricate a cylindrical structure hybrid nanogenerator based on spring structure to effectively scavenge vibration energy. The introduction of spring structure not only enhances the space utilization, but also supports the moving magnet. Owing to its innovative structure, the instantaneous output power of TENG and EMG are 0.88 mW at a load of 10 MΩ and 216.7 mW at a load of 60 Ω, respectively. With the aids of a power management circuit, the hybrid nanogenerator can provide continuous power for two hygrothermographs connected in series. In addition, a self-powered wireless acceleration sensing monitoring system(SWAM) is developed to measure the acceleration signals of vibration sources. This study provides a novel guideline for harvesting mechanical vibration energy.

关键词： mechanical vibration energy spring structure triboelectric electromagnetic wireless monitoring system

triboelectric properties of ilmenite and quartz minerals and investigation of triboelectric separation of ilmenite ore

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International Journal of Mining Science and Technology 2018年第2期28卷 223-230页

作者： Yang Xing Wang Haifeng Peng Zhen Hao Juan Zhang Guangwen Xie Weining He Yaqun Key Laboratory of Coal Processing and Efficient Utilization China University of Mining and TechnologyMinistry of EducationXuzhou 221116China School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221116China Jinan Yuxing Chemical Co.Ltd. Jinan 250119China Advanced Analysis&Computation Center China University of Mining&TechnologyXuzhou 221116China

triboelectric separation, as an entirely dry technology, is a prospective method to process fine minerals.The aim of this paper is to investigate the performance of triboelectric separation of ilmenite and quartz minerals in a lab unit and to get ready for the separation of ilmenite ore. A tribocharge measurement system was used to test the triboelectric properties of ilmenite and quartz particles with tribochargers respectively made of PVC, PPR, PMMA, Teflon, copper, stainless steel and quartz glass. The results show that the ilmenite particles charged positively while quartz charged negatively when tribocharged with PVC tribocharger. The mixture of 12% ilmenite and 88% quartz was prepared for the triboelectric separation. The recovery of ilmenite increases with the increase of airflow rate, decreases with the increasing feed rate, and grows up firstly and then decreases with the increasing voltage. A maximum ilmenite recovery of 51.71% with ilmenite content 32.72% was obtained at 40 m^3/h airflow rate, 6 g/s feed rate and 20 kV voltage. According to the optimal parameters of the separation of ilmenite and quartz mixture,fine ilmenite ore with 7.55% Ti content was beneficiated using the unit and the Ti content increased to 12.32% in concentrate product.

关键词： triboelectric separation Tribocharge Ilmenite Quartz Ilmenite ore

Spiral Steel Wire Based Fiber-Shaped Stretchable and Tailorable triboelectric Nanogenerator for Wearable Power Source and Active Gesture Sensor

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Nano-Micro Letters 2019年第3期11卷 36-45页

作者： Lingjie Xie Xiaoping Chen Zhen Wen Yanqin Yang Jihong Shi Chen Chen Mingfa Peng Yina Liu Xuhui Sun Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon.Based Functional Materials and DevicesSoochow UniversitySuzhou215123People’s Republic of China Nantong Textile and Silk Industrial Technology Research Institute Jiangsu Industrial Technology ResearchInstitute of Textile and SilkNantong 226314People’s Republic of China Department of Mathematical Sciences Xi’an Jiaotong-Liverpool UniversitySuzhou215123People’s Republic of China

Continuous deforming always leads to the performance degradation of a flexible triboelectric nanogenerator due to the Young’s modulus mismatch of different functional layers.In this work,we fabricated a fiber-shaped stretchable and tailorable triboelectric nanogenerator(FST-TENG)based on the geometric construction of a steel wire as electrode and ingenious selection of silicone rubber as triboelectric layer.Owing to the great robustness and continuous conductivity,the FST-TENGs demonstrate high stability,stretchability,and even tailorability.For a single device with ~6 cm in length and ~3 mm in diameter,the open-circuit voltage of ~59.7 V,transferred charge of ~23.7 nC,short-circuit current of ~2.67 μA and average power of ~2.13 μW can be obtained at 2.5 Hz.By knitting several FST-TENGs to be a fabric or a bracelet,it enables to harvest human motion energy and then to drive a wearable electronic device.Finally,it can also be woven on dorsum of glove to monitor the movements of gesture,which can recognize every single finger,different bending angle,and numbers of bent finger by analyzing voltage signals.

关键词： triboelectric nanogenerator Stretchable Human motion energy Wearable power source Active gesture sensor

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 equipment.Reducing the frictionwear and energy loss in breeze energy collection is a research direction worthy of attention.Herein,a flutter-effect-based triboelectricnanogen erator(FE-TENG)is designed to collect the breeze energy at low wind speed from arbitrary directions.Distinguishing 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,respectively.In 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 signal.Furthermore,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/s.This 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

Fundamental theories and basic principles of triboelectric effect: A review

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Friction 2019年第1期7卷 2-17页

作者： Shuaihang PAN Zhinan ZHANG School of Mechanical Engineering Shanghai Jiao Tong University School of Mechanical & Aerospace Engineering University of California Los Angeles

Long-term observation of the triboelectric effect has not only proved the feasibility of many novel and useful tribo-devices(e.g., triboelectric nanogenerators), but also constantly motivated the exploration of its mysterious nature. In the pursuit of a comprehensive understanding of how the triboelectric process works, a more accurate description of the triboelectric effect and its related parameters and factors is urgently required. This review critically goes through the fundamental theories and basic principles governing the triboelectric process. By investigating the difference between each charging media, the electron, ion, and material transfer is discussed and the theoretical deduction in the past decades is provided. With the information from the triboelectric series, interesting phenomena including cyclic triboelectric sequence and asymmetric triboelectrification are precisely analyzed. Then, the interaction between the tribo-system and its operational environment is analyzed, and a fundamental description of its effects on the triboelectric process and results is summarized. In brief, this review is expected to provide a strong understanding of the triboelectric effect in a more rigorous mathematical and physical sense.

关键词： triboelectric effect triboelectrification triboelectric nanogenerators(TENGs) interface

All-nanofiber self-powered PTFE/PA66 device for real-time breathing monitor by scalable solution blow spinning technology

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Nano Research 2022年第9期15卷 8458-8464页

作者： Pan Li Yibo Liu Han Zhang Zhiping Hu Luna Jia Dongkui Liu Lu Yu Bo Li Youwei Yao School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolShenzhen 518055China

All-nanofiber self-powered device was fabricated using simple,low-cost,safe,and scalable solution blow spinning(SBS)technology for real-time respiratory monitor and timely identification of respiratory obstruction clinically.Polytetrafluoroethylene(PTFE)and polyamide-66(PA66)nanofibers were selected as triboelectric pairs,owing to strong ability to gain electrons of PTFE and supply electrons of PA66.Poly(ethylene oxide)(PEO)was added to regulate spinning solution viscosity and prepare PTFE/PEO nanofibers,and the morphology and diameter distribution of nanofibers were discussed.PTFE nanofiber film was obtained after the decomposition of PEO in PTFE/PEO nanofiber and melt flow of PTFE pellets in a limited region,and possessed a tensile strength of 1.05 MPa and elongation at a break of 288.58%.Later,PTFE/PA66 all-nanofiber self-powered device was constructed containing PA66 nanofibers,and Au deposition film was used as electrodes by magnetron sputtering.The as-obtained device showed robust electrical performance with an open circuit voltage of~110 V at a loading force of 10 N,a short-circuit current of~5 uA at a loading force of 10 N and a frequency of 4 Hz,a maximum power density of 562 mW·m^(–2),and a current of 3.1 uA at a loading resistance of 30 MΩ.Based on the triboelectric mechanism,the device possessed stable response and effective sensibility for stimuli,was used to monitor human breathing conditions,prevent suffocation,and distinguish slow,normal,and fast breathing,with an output voltage of~0.08 V perceived in one normal respiratory circle.

关键词： polytetrafluoroethylene(PTFE) nanofibers triboelectric flexible electronics

Screen-printed soft triboelectric nanogenerator with porous PDMS and stretchable PEDOT:PSS electrode

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Journal of Semiconductors 2019年第11期40卷 99-105页

作者： Haochuan Wan Yunqi Cao Li-Wei Lo Zhihao Xu Nelson Sepulveda Chuan Wang Electrical and Systems Engineering Washington University in St.LouisSt LouisMissouri 63130United States Electrical and Computer Engineering Michigan State UniversityEast LansingMichigan 48824United States Institute of Materials Science and Engineering Washington University in St.LouisSt.LouisMissouri 63130United States

The recent development on wearable and stretchable electronics calls for skin conformable power sources that are beyond current battery technologies.Among the many novel energy devices being explored,triboelectric nanogenerator(TENG)made from intrinsically stretchable materials has a great potential to meet the above requirement as being both soft and efficient.In this paper,we present a lithography-free and low-cost TENG device comprising a porous-structured PDMS layer and a stretchable PEDOT:PSS electrode.The porous PDMS structure is formed by using self-assembled polystyrene beads as the sacrificial template and it is highly ordered with great uniformity and high structural stability under compression force.Moreover,the porous PDMS TENG exhibits improved output voltage and current of 1.65 V and 0.54 nA compared to its counterpart with non-porous PDMS with 0.66 V and 0.34 nA.The effect of different loading force and frequency on the output response of the TENG device has also been studied.This work could shed light on diverse structural modification methods for improving the performance of PDMS-based TENG and the development of intrinsically stretchable TENG for wearable device applications.

关键词： triboelectric nanogenerator (TENG) porous PDMS stretchable materials wearable electronics

摩擦电、电化学、压电和介电弹性体能量回收器的低频能量回收性能的提升策略:研究进展及挑战

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Science Bulletin 2023年第15期68卷 1687-1714,M0004页

作者：夏侯幸子吴思佳郭新李华健陈晨徐鸣 School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

机械能回收是指将海浪、风和人体运动等各种形式的机械能转化为电能的一种方法.这为解决化石燃料的枯竭和环境问题提供了一个可行性方案.然而,将机械能直接转化为电能的主要障碍是大多数机械能源的低频率(≤5赫兹)会导致能量转换效率、... 详细信息

机械能回收是指将海浪、风和人体运动等各种形式的机械能转化为电能的一种方法.这为解决化石燃料的枯竭和环境问题提供了一个可行性方案.然而,将机械能直接转化为电能的主要障碍是大多数机械能源的低频率(≤5赫兹)会导致能量转换效率、输出功率和输出电流偏低.近年来,许多研究报道了利用工作机制创新来改进能量收集技术的方法.本综述旨在深入分析基于摩擦电、电化学、压电和介电弹性体效应的低频能量回收技术的研究进展.从概述与低频能量回收有关的困难开始,阐明了影响机械能量回收器低频回收性能的关键因素,包括工作机制、环境因素和设备组成,同时比较和总结了不同机制在低频能量回收中的优缺点.此外,该综述还阐述了通过优化材料成分、结构和装置设计来提高低频能量回收性能的策略,并展示了机械能回收器在波浪能、风能和人体运动能量回收方面的应用.最后,针对不同应用场景,提供了对机械能回收机制选择的推荐,为新一代能量回收器的改进和制造提供了思路.

关键词： Energy harvesting Low-frequency triboelectric Piezoelectric Nanocarbon

Hybridized Mechanical and Solar Energy-Driven Self-Powered Hydrogen Production

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Nano-Micro Letters 2020年第7期12卷 135-144页

作者： Xuelian Wei Zhen Wen Yina Liu Ningning Zhai Aimin Wei Kun Feng Guotao Yuan Jun Zhong Yinghuai Qiang Xuhui Sun Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments School of Materials Science and EngineeringChina University of Mining and TechnologyXuzhou 221116People’s Republic of China Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano and Soft Materials(FUNSOM)Soochow UniversitySuzhou 215123People’s Republic of China Department of Mathematical Sciences Xi’an Jiaotong-Liverpool UniversitySuzhou 215123People’s Republic of China

Photoelectrochemical hydrogen generation is a promising approach to address the environmental pollution and energy crisis.In this work,we present a hybridized mechanical and solar energy-driven selfpowered hydrogen production system.A rotatory disc-shaped triboelectric nanogenerator was employed to harvest mechanical energy from water and functions as a su cient external power source.WO3/BiVO4 heterojunction photoanode was synthesized in a PEC water-splitting cell to produce H2.After transformation and rectification,the peak current reaches 0.1 m A at the rotation speed of 60 rpm.In this case,the H2 evolution process only occurs with sunlight irradiation.When the rotation speed is over 130 rpm,the peak photocurrent and peak dark current have nearly equal value.Direct electrolysis of water is almost simultaneous with photoelectrocatalysis of water.It is worth noting that the hydrogen production rate increases to 5.45 and 7.27μL min-1 without or with light illumination at 160 rpm.The corresponding energy conversion e ciency is calculated to be 2.43%and 2.59%,respectively.All the results demonstrate such a self-powered system can successfully achieve the PEC hydrogen generation,exhibiting promising possibility of energy conversion.

关键词： WO3/BiVO4 heterojunction Photoelectrochemical hydrogen generation triboelectric nanogenerator Mechanical energy Solar energy

Nanogenerators for Self-Powered Gas Sensing

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Nano-Micro Letters 2017年第4期9卷 81-99页

作者： Zhen Wen Qingqing Shen Xuhui Sun Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devicesand Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215123People’s Republic of China

Looking toward world technology trends over the next few decades, self-powered sensing networks are a key field of technological and economic driver for global industries. Since 2006, Zhong Lin Wang's group has proposed a novel concept of nanogenerators(NGs), including piezoelectric nanogenerator and triboelectric nanogenerator, which could convert a mechanical trigger into an electric output. Considering motion ubiquitously exists in the surrounding environment and for any most common materials used every day, NGs could be inherently served as an energy source for our daily increasing requirements or as one of self-powered environmental sensors. In this regard, by coupling the piezoelectric or triboelectric properties with semiconducting gas sensing characterization, a new research field of self-powered gas sensing has been proposed. Recent works have shown promising concept to realize NG-based self-powered gas sensors that are capable of detecting gas environment without the need of external power sources to activate the gas sensors or to actively generate a readout signal. Compared with conventional sensors, these self-powered gas sensors keep the approximate performance.Meanwhile, these sensors drastically reduce power consumption and additionally reduce the required space for integration,which are significantly suitable for the wearable devices. This paper gives a brief summary about the establishment and latest progress in the fundamental principle, updated progress and potential applications of NG-based self-powered gas sensing system. The development trend in this field is envisaged, and the basic configurations are also introduced.

关键词： Nanogenerator Self-powered Gas sensing Piezoelectric triboelectric