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Triboelectric gait sensing analysis system for self-powered IoT-based human motion monitoring

InfoMat 2024年第5期6卷 69-81页

作者： Leilei Zhao Xiao Guo Yusen Pan Shouchuang Jia Liqiang Liu Walid ADaoud Peter Poechmueller Xiya Yang Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhouthe People's Republic of China School of Microelectronics Shandong UniversityJinanthe People's Republic of China College of Electronics and Information Engineering Tongji UniversityShanghaithe People's Republic of China Department of Mechanical Engineering City University of Hong KongHong Kongthe People's Republic of China

Quantitative analysis of gait parameters,such as stride frequency and step speed,is essential for optimizing physical exercise for the human ***,the current electronic sensors used in human motion monitoring remain constrained by factors such as battery life and *** study developed a self-powered gait analysis system(SGAS)based on a triboelectric nanogenerator(TENG)fabricated electrospun composite nanofibers for motion monitoring and gait analysis for regulating exercise *** SGAS consists of a sensing module,a charging module,a data acquisition and processing module,and an Internet of Things(IoT)*** the sensing module,two specialized sensing units,TENG-S1 and TENG-S2,are positioned at the forefoot and heel to generate synchronized signals in tandem with the user's *** signals are instrumental for real-time step count and step speed *** output of the two TENG units is significantly improved by systematically investigating and optimizing the electrospun composite nanofibers'composition,strength,and wear ***,a charge amplifier circuit is implemented to process the raw voltage signal,consequently bolstering the reliability of the sensing *** refined data is then ready for further reading and calculation by the micro-controller unit(MCU)during the signal transmission ***,the well-conditioned signals are wirelessly transmitted to the IoT platform for data analysis,storage,and visualization,enhancing human motion monitoring.

关键词： electrospun nanofiber gait analysis human motion monitoring self-powered system wearable triboelectric sensor

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Recent progress on flexible nanogenerators toward self-powered systems

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InfoMat 2020年第2期2卷 318-340页

作者： Yiming Liu Lingyun Wang Ling Zhao Xinge Yu Yunlong Zi Department of Biomedical Engineering City University of Hong KongHong KongPeople's Republic of China Department of Mechanical and Automation Engineering Chinese University of Hong KongHong KongPeople's Republic of China

The advances in wearable/flexible electronics have triggered tremendous demands for flexible power sources,where flexible nanogenerators,capable of converting mechanical energy into electricity,demonstrate its great ***,recent progress on flexible nanogenerators for mechanical energy harvesting toward self-powered systems,including flexible piezoelectric and triboelectric nanogenerator,is *** emphasis is mainly on the basic working principle,the newly developed materials and structural design as well as associated typical applications for energy harvesting,sensing,and selfpowered *** addition,the progress of flexible hybrid nanogenerator in terms of its applications is also ***,the challenges and future perspectives toward flexible self-powered systems are reviewed.

关键词： flexible systems hybrid nanogenerator mechanical energy harvesting piezoelectric nanogenerator self-powered system triboelectric nanogenerator

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Carbon nanodot-based flexible and self-powered white displays

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Nano Research 2025年第2期18卷 733-740页

作者： Wei Zhang Qing Lou Junlu Sun Juan Liao Guangsong Zheng Fuhang Jiao Wu Chen Xiang Li Jiajia Meng Chong-Xin Shan Lin Dong Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of EducationSchool of PhysicsZhengzhou UniversityZhengzhou 450052China

Carbon nanodots(CDs)have emerged as a promising luminescent material,showing significant potential in biological imaging,information security,and illumination displays withintheinternet of things(loT).However,CDs-based electroluminescent devices,especially flexible and self-powered white displays,remain scarcely reported,which limit their applications in human-machine interactions and wearable optoelectronics in the ***,we present a pioneering CDs-based flexible and self-powered white display system with a Commission Internationale de L'Eclairage(CIE)coordinate of(0.31,0.39)by integrating CDs-based alternating current electroluminescent(AcEL)devices with triboelectric *** CDs-based white ACEL devices can be dynamically modulated from light green to white under various supplied frequencies ranging from 50 to 500 *** devices also render from cold white to warm white with correlated color temperature from 9705 to 4538 K,as the concentration ratios of ZnS:Cu phosphors to CDs change from 22:2 to 22:***,these devices exhibit excellent flexibility and stability,maintaining over 95%of their electroluminescent intensities after 4500 cycles even under a large bending angle of 180°with a bending radius of 4.9 ***,this CDs-based flexible and self-powered white display system is worn on the human body to realize real-time illumination display powered by biomechanical energy,such as hand slapping and *** work provides a novel design strategy toward high-performance CD-based flexible and self-powered white displays and expands their potential applications in wearable optoelectronics for the loT.

关键词： carbon nanodot(CD) self-powered system alternating current electroluminescence white display flexible devices

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Recent advances in nature inspired triboelectric nanogenerators for self-powered systems

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International Journal of Extreme Manufacturing 2024年第6期6卷 76-105页

作者： Baosen Zhang Yunchong Jiang Tianci Ren Baojin Chen Renyun Zhang Yanchao Mao Henan Energy Conversion and Storage Materials Engineering Center College of ScienceHenan University of EngineeringZhengzhou 451191People's Republic of China Key Laboratory of Materials Physics of Ministry of Education School of PhysicsZhengzhou UniversityZhengzhou 450001People's Republic of China Department of Engineering Mathematicsand Science EducationMid Sweden UniversityHolmgatan 10SundsvallSE 85170Sweden

Triboelectric nanogenerators(TENGs)stand at the forefront of energy harvesting innovation,transforming mechanical energy into electrical power through triboelectrification and electrostatic *** groundbreaking technology addresses the urgent need for sustainable and renewable energy solutions,opening new avenues for self-powered *** their potential,TENGs face challenges such as material optimization for enhanced triboelectric effects,scalability,and improving conversion efficiency under varied *** and environmental stability also pose significant hurdles,necessitating further research towards more resilient *** inspired TENG designs offer promising solutions by emulating biological processes and structures,such as the energy mechanisms of plants and the textured surfaces of animal *** biomimetic approach has led to notable improvements in material properties,structural designs,and overall TENG performance,including enhanced energy conversion efficiency and environmental *** exploration into bio-inspired TENGs has unlocked new possibilities in energy harvesting,self-powered sensing,and wearable electronics,emphasizing reduced energy consumption and increased efficiency through innovative *** review encapsulates the challenges and advancements in nature inspired TENGs,highlighting the integration of biomimetic principles to overcome current *** focusing on augmented electrical properties,biodegradability,and self-healing capabilities,nature inspired TENGs pave the way for more sustainable and versatile energy solutions.

关键词： triboelectric nanogenerator nature inspired self-powered sensor self-powered system

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Enabling built-in electric fields on rhenium-vacancy-rich heterojunction interfaces of transition-metal dichalcogenides for pH-universal efficient hydrogen and electric energy generation

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Carbon Energy 2024年第9期6卷 195-209页

作者： Benzhi Wang Lixia Wang Ji Hoon Lee Tayirjan Taylor Isimjan Hyung Mo Jeong Xiulin Yang Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilinChina Department of Smart Fab.Technology School of Mechanical EngineeringSungkyunkwan UniversitySuwonRepublic of Korea School of Materials Science and Engineering Kyungpook National UniversityDaeguRepublic of Korea Saudi Arabia Basic Industries Corporation(SABIC)at King Abdullah University of Science and Technology(KAUST) ThuwalSaudi Arabia

Most advanced hydrogen evolution reaction(HER)catalysts show high activity under alkaline ***,the performance deteriorates at a natural and acidic pH,which is often problematic in practical ***,a rhenium(Re)sulfide–transition-metal dichalcogenide heterojunc-tion catalyst with Re-rich vacancies(NiS_(2)-ReS_(2)-V)has been *** optimized catalyst shows extraordinary electrocatalytic HER performance over a wide range of pH,with ultralow overpotentials of 42,85,and 122 mV under alkaline,acidic,and neutral conditions,***,the two-electrode system with NiS_(2)-ReS_(2)-V1 as the cathode provides a voltage of 1.73 V at 500 mA cm^(-2),superior to industrial ***,the open-circuit voltage of a single Zn–H_(2)O cell with NiS_(2)-ReS_(2)-V1 as the cathode can reach an impressive 90.9% of the theoretical value,with a maximum power density of up to 31.6 mW cm^(-2).Moreover,it shows remarkable stability,with sustained discharge for approximately 120 h at 10 mA cm^(-2),significantly outperforming commercial Pt/C catalysts under the same conditions in all aspects.A series of systematic characterizations and theoretical calculations demonstrate that Re vacancies on the heterojunction interface would generate a stronger built-in electric field,which profoundly affects surface charge distribution and subsequently enhances HER performance.

关键词： built-in electric field electrocatalysts hydrogen evolution reaction self-powered system water splitting Zn-H_(2)O cell

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Triboelectric nanogenerators: Fundamental physics and potential applications

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Friction 2020年第3期8卷 481-506页

作者： Linglin ZHOU Di LIU Jie WANG Zhong Lin WANG Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China Collge of Nanoscience and Technolog University of Chinese Academy of SciencesBejing 100049China School of Materials Science and Engineering Georgia Institute of TechmologAtlantaGA 30332USA

Based on the conjunction of contact electrification and electrostatic induction,triboelectric nanogenerators(TENGs)can harvest mechanical energy dispersed in our *** the characteristics of simple structure,light weight,broad material availability,low cost,and high efficiency even at low operation frequency,TENG can serve as a promising alternative strategy for meeting the needs of distributed energy for the internet of things and *** major potential applications of TENG can be summarized as four fields containing micro/nano power sources,self-powered sensors,large-scale blue energy,and direct high-voltage power *** this paper,the fundamental physics,output performance enhancement,and applications of TENGs are reviewed to timely summarize the development of TENGs and provide a guideline for future research.

关键词： contact electrification self-powered system energy harvesting triboelectric nanogenerator

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self-supported metal(Fe, Co, Ni)-embedded nitrogen-doping carbon nanorod framework as trifunctional electrode for flexible Zn-air batteries and switchable water electrolysis

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Green Energy & Environment 2023年第6期8卷 1644-1653页

作者： Qiuyan Jin Liping Xiao Weidong He Hao Cui Chengxin Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou510275China The Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong Province Sun Yat-sen UniversityGuangzhou510275China

To meet the practical demand of wearable/portable electronics, developing high-efficiency and durable multifunctional catalyst and in-situ assembling catalysts into electrodes with flexible features are urgently needed but challenging. Herein, we report a simple route to fabricate bendable multifunctional electrodes by in-situ carbonization of metal ion absorbed polyaniline precursor. Alloy nanoparticles encapsulated in graphite layer are uniformly distributed in the N-doping carbon nanorod skeleton. Profiting from the favorable free-standing structure and the cooperative effect of metallic nanoparticles, graphitic layer and N doped-carbon architecture, the trifunctional electrodes exhibit prominent activities and stability toward HER, OER and ORR. Notably, due to the protection of carbon layer, the electrocatalysts show the reversible catalytic HER/OER properties. The overall water splitting device can continuously work for 12 h under frequent exchanges of cathode and anode. Importantly, the bendable metal air batteries fabricated by self-supported electrode not only displays the outstanding battery performance,achieving a decent peak power density(125 mW cm^(-2)) and exhibiting favorable charge-discharge durability of 22 h, but also holds superb flexible stability. Specially, a lightweight self-driven water splitting unit is demonstrated with stable hydrogen production.

关键词： Trifunctional catalysts self-supported electrodes Switchable water splitting Flexible Zn-air battery self-powered system

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Rational modulation of electronic structure in PtAuCuNi alloys boosts efficient electrocatalytic ethanol oxidation assisted with energy-saving hydrogen evolution

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Journal of Energy Chemistry 2024年第6期93卷 557-567,I0014页

作者： Hu Yao Yinan Zheng Xin Yu Songjie Hu Baolian Su Xiaohui Guo Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education The College of Chemistry and Materials ScienceNorthwest UniversityXi’an 710069ShaanxiChina Department of Inorganic Chemistry University of NamurBruxellesB-5000 NamurBelgium

Compared to conventional electrocatalytic water splitting,electrocatalytic ethanol oxidation reaction(EOR)along with hydrogen production is considered a more energy-efficient ***,we prepared a type of novel quaternary alloy catalyst(PtAuCuNi@NF)that exhibits excellent activity for EOR(0.215 V at 10 mA cm^(-2))and hydrogen evolution reaction(HER)(7 mV at 10 mA cm^(-2)).Experimental results demonstrated that both Cu and Ni modulated the electronic environment around Pt and *** electron-rich active center facilitates the rapid adsorption and dissociation of reactants and intermediates for both EOR and ***,in the ethanol-assisted overall water splitting(E-OWS),a current density of 10 mA cm^(-2)was achieved at 0.28 ***,an advanced acid-base self-powered system(A-Bsps)that can achieve a self-powered voltage of 0.59 V was ***,the self-driven hydrogen production with zero external power supply was realized by integrating A-Bsps with the E-OWS *** interesting results can provide a feasible strategy for designing and developing advanced nanoalloy-based materials for clean energy integration and use in various fields.

关键词： Pt-based alloy Electronic structure Ethanol oxidation self-powered system Overall water splitting

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Investigation and characterization of an arc-shaped piezoelectric generator

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Science China(Technological Sciences) 2013年第11期56卷 2636-2641页

作者： HAN MengDi LIU Wen ZHANG XiaoSheng MENG Bo ZHANG HaiXia Institute of Microelectronics Peking University Peking University Shenzhen Graduate School

A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically *** a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30.7μ*** maximum power density reaches 38.4μW/cm3with a 4 cm×2 cm×100μm device,at the optimum load resistance of 33.33 *** influence of frequency,size dimension and load resistance are investigated through experimental *** this high output arc-shaped generator,capacitors can be effectively charged and three commercial LEDs have been directly lighted without any energy storage unit.

关键词： piezoelectric generator arc-shaped PVDF high output self-powered system

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Constructing high-capacity and flexible aqueous zinc-ion batteries with air-recharging capability using organic cathodes

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Chinese Chemical Letters 2024年第3期35卷 468-472页

作者： Xiaojuan Chen Haoqi Su Baozhu Yang Xiaocen Liu Xiuting Song Lixin Su Gui Yin Qi Liu Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis Green Manufacturing Collaborative Innovation Center and School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China State Key Laboratory of Coordination Chemistry Nanjing UniversityNanjing 210093China

Flexible aqueous zinc-ion batteries(AZIBs)with air-recharging capability are a promising self-powered system applied in future wearable *** is desired to develop high-capacity air-rechargeable ***,we developed a flexible AZIB with air-recharging capability based on trinitrohexaazatrinaphthylene(TNHATN)cathode and a ZnSO_(4)*** flexible Zn//TNHATN battery exhibits high volumetric energy density(21.36 mWh/cm^3)and excellent mechanical ***,the discharged flexible Zn//TNHATN battery can be chemical self-charged via the redox reaction between TNHATN cathode and O_(2)from the *** oxidation in air for 15 h,such flexible Zn//TNHATN battery can deliver a high specific capacity of 320 mAh/g at 0.5 A/g,displaying excellent air-recharging ***,this flexible Zn//TNHATN battery also works well in chemical or/and galvanostatic charging mixed modes,showing *** work provides a new insight for designing flexible aqueous self-powered systems.

关键词： Aqueous zinc-ion battery Trinitrohexaazatrinaphthylene Organic cathode materials Flexible air-rechargeable battery self-powered system

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