Two voltages in contact-separation triboelectric nanogenerator: From asymmetry to symmetry for maximum output

Wang, Zhao; Liu, Wenlin; Hu, Jianlin; He, Wencong; Yang, Haixia; Ling, Chao; Xi, Yunfei; Wang, Xue; Liu, Anping; Hu, Chenguo

doi:10.1016/j.nanoen.2020.104452

Cited by 96 publications

(53 citation statements)

References 29 publications

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“…In other words, steel plate with smaller stiffness is beneficial to the separation of two electrodes, which may be favorable for a high output voltage according to the formula as bellows [ 47 ]: where Q defines the amount of transferred charges between the two electrodes, S is the effective contact area between the tribolayers, d 0 is the dielectric thickness, ε 0 denotes the vacuum dielectric constant, x ( t ) is the separation distance between two friction materials, and б is the triboelectric charge density. However, at a rotational status, the steel sheet stiffness is not the smaller the better, because it will directly affect the contact strength, effective friction area, and contact/separation velocity of two electrodes, thus influencing the electrical production of TENG [ 48 – 50 ]. Therefore, it is of great significance to figure out the optimal steel plate parameter.…”

Section: Resultsmentioning

confidence: 99%

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

Zhang

Zeng

et al. 2020

Nano-Micro Lett.

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HIGHLIGHTS • A novel windmill-like hybrid nanogenerator with contact-separation structure was proposed for harvesting breeze energy at low wind speed. • A spring steel sheet was creatively used both as an electrode of triboelectric nanogenerator and a booster for contact-separation activity. • A magnetic acting as a bifunctional element supplies magnetic flux variation in electromagnetic generator and overcomes electrostatic adsorption between tribolayers simultaneously.

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Section: Resultsmentioning

confidence: 99%

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

Zhang

Zeng

et al. 2020

Nano-Micro Lett.

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“…If the two materials are brought into contact again, the electric potential will disappear and electrons will flow in a reverse direction. Thus, under periodic contact and separation, alternating current (AC) can be generated on the external load, and a rectification circuit is normally required for energy storage to convert the AC output into the direct current (DC) output [ 21 – 23 ]. There are also some advanced designs of DC-TENGs that do not need a rectification circuit before energy storage [ 24 – 28 ], but they exhibit more complicated structures and most developed TENGs are still AC-based.…”

Section: Transducing Mechanisms and Generator Principlesmentioning

confidence: 99%

Triboelectric Nanogenerators and Hybridized Systems for Enabling Next-Generation IoT Applications

et al. 2021

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In the past few years, triboelectric nanogenerator-based (TENG-based) hybrid generators and systems have experienced a widespread and flourishing development, ranging among almost every aspect of our lives, e.g., from industry to consumer, outdoor to indoor, and wearable to implantable applications. Although TENG technology has been extensively investigated for mechanical energy harvesting, most developed TENGs still have limitations of small output current, unstable power generation, and low energy utilization rate of multisource energies. To harvest the ubiquitous/coexisted energy forms including mechanical, thermal, and solar energy simultaneously, a promising direction is to integrate TENG with other transducing mechanisms, e.g., electromagnetic generator, piezoelectric nanogenerator, pyroelectric nanogenerator, thermoelectric generator, and solar cell, forming the hybrid generator for synergetic single-source and multisource energy harvesting. The resultant TENG-based hybrid generators utilizing integrated transducing mechanisms are able to compensate for the shortcomings of each mechanism and overcome the above limitations, toward achieving a maximum, reliable, and stable output generation. Hence, in this review, we systematically introduce the key technologies of the TENG-based hybrid generators and hybridized systems, in the aspects of operation principles, structure designs, optimization strategies, power management, and system integration. The recent progress of TENG-based hybrid generators and hybridized systems for the outdoor, indoor, wearable, and implantable applications is also provided. Lastly, we discuss our perspectives on the future development trend of hybrid generators and hybridized systems in environmental monitoring, human activity sensation, human-machine interaction, smart home, healthcare, wearables, implants, robotics, Internet of things (IoT), and many other fields.

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“…Interestingly, 4S principle (simple, safe, satisfy and save) of pulmonary rehabilitation guidelines for COVID-19 patients have been established in China, in order to build a practical and feasible rehabilitation method in response to the extraordinary pressure [ 17 ]. This 4S principle is both applicable to inpatient and outpatient management.…”

Section: Rehabilitation For Inpatientmentioning

confidence: 99%

“…Rehabilitation does not apply to inpatient when severe or critical conditions occur, such as loss of consciousness and acute myocardial ischemia [ 1 ]. Moreover, rehabilitation is also recommended to exempt patients with progressive symptoms such as rising temperature, acute dyspnea, SpO2 below 90%, abnormal blood pressure either over 180 mmHg or below 90 mmHg, abnormal respiratory rate or heart rate, any symptom of shock or systemic inflammatory response syndrome [ 17 , 24 ]. In fact, around 5% of apparently healthy patients could progress into severe conditions [ 23 ].…”

Section: Rehabilitation For Inpatientmentioning

confidence: 99%

Role of rehabilitation amidst the COVID-19 pandemic: a review

Helwig

2021

J Transl Med

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COVID-19 remains globally a highly infectious disease targeting multiple organs. Rehabilitation is increasingly valued among the supportive care fields to combat COVID-19 as currently definitive curative treatment remains largely absent. This narrative review is to address rehabilitation related topics associated with the treatment of COVID-19 patients. Nosocomial spread remains a high risk for healthcare workers, with comparable high ratios of exposed workers suffering from the disease with more severe clinical course. Primary principle of rehabilitation is to protect rehabilitation physicians and cover all person-to-person interactions. Translating perspectives are encouraged through each multidisciplinary approach. Rehabilitation for the outpatient remains a potential beneficial approach. Artificial intelligence can potentially provide aid and possible answers to important problems that may emerge involving COVID-19. The real value of rehabilitation in COVID-19 may be very impactful and beneficial for patient’s physical and mental health.

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Two voltages in contact-separation triboelectric nanogenerator: From asymmetry to symmetry for maximum output

Cited by 96 publications

References 29 publications

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

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

Triboelectric Nanogenerators and Hybridized Systems for Enabling Next-Generation IoT Applications

Role of rehabilitation amidst the COVID-19 pandemic: a review

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