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Nian-Wu Li, Yingying Yin, Xinyu Du, Xiuling Zhang, Zuqing Yuan, Huidan Niu, Ran Cao, Wei Fan, Yang Zhang, Weihua Xu, Congju Li
Lithium metal batteries (LMBs) are prominent among next-generation energy-storage systems because of their high energy density. Unfortunately, the commercial application of LMBs is hindered by dendrites growth issue during charging process. Herein, we report that the triboelectric nanogenerator (TENG) based pulse output with novel waveform and frequency has restrained the formation of dendrites in LMBs. The waveform and operation frequency of TENG can be regulated by TENG designed and smart power management circuits...
December 11, 2018: ACS Applied Materials & Interfaces
Nandang Mufti, Siti Maryam, Anggun A Fibriyanti, Robi Kurniawan, Abdulloh Fuad, Ahmad Taufiq, Sunaryono
We report on the effect of the morphological modification on optical properties and polarization of ZnO nanorods (NR). Here, the morphology and structure of the ZnO NR were modified by introducing different annealing temperatures. The increase of length and diameter and change in density of the ZnO NR were clearly observed by increasing the annealing temperature. We found that the samples show different oxygen vacancy (VO ) and zinc interstitial (ZnI ) concentrations. We suggest that the different concentrations of VO and ZnI are originated from morphological and structural modification...
2018: Scanning
Nikolay Borodinov, Anton V Ievlev, Jan Michael Carrillo, Liam Collins, Andrea Calamari, Marc Mamak, Patrick John Mulcahy, Bobby G Sumpter, Olga Ovchinnikova, Petro Maksymovych
Triboelectric charging strongly affects the operation cycle and handling of materials and can be used to harvest mechanical energy through triboelectric nanogenerator set-up. Despite ubiquity of triboelectric effects, a lot of mechanisms surrounding the relevant phenomena remain to be understood. Continued progress will rely on the development of rapid and reliable methods to probe accumulation and dynamics of static charges. Here, we demonstrate in-situ quantification of tribological charging with nanoscale resolution, that is applicable to a wide range of dielectric systems...
November 1, 2018: Nanotechnology
Hao-Yang Mi, Xin Jing, Zhiyong Cai, Yuejun Liu, Lih-Sheng Turng, Shaoqin Gong
Boosting power generation performance while employing economical and biocompatible materials is an ongoing direction in the field of triboelectric nanogenerators (TENGs). Here, highly porous, biocompatible, cellulose nanofibril (CNF) composite-based TENGs are developed through an environmentally friendly freeze-drying approach. High tribopositivity materials, including silica fiber, human hair, and rabbit fur, are used as fillers in composite TENG fabrication for the first time to enhance the triboelectric output performance...
December 5, 2018: Nanoscale
Wen He, Yongteng Qian, Byeok Song Lee, Fangfang Zhang, Aamir Rasheed, Jae-Eun Jung, Dae Joon Kang
We demonstrated a hybrid nanogenerator exploiting both piezoelectric and triboelectric effects induced from ZnO nanoflakes (NFs)/polydimethylsiloxane composite films through a facile, cost-effective fabrication method. This hybrid nanogenerator exhibited not only high piezoelectric output current owing to the enhanced surface piezoelectricity of the ZnO NFs but also high triboelectric output voltage owing to the pronounced triboelectrification of Au-PDMS contact, producing peak-to-peak output voltage of ~470 V, current density of ~60 μA·cm-2, and average power density of ~28...
December 3, 2018: ACS Applied Materials & Interfaces
Yin Long, Hao Wei, Jun Li, Guang Yao, Bo Yu, Dalong Ni, Angela Lf Gibson, Xiaoli Lan, Yadong Jiang, Weibo Cai, Xudong Wang
Skin wound healing is a major health care issue. While electric stimulations have been known for decades to be effective for facilitating skin wound recovery, practical applications are still largely limited by the clumsy electrical systems. Here, we report an efficient electrical bandage for accelerated skin wound healing. On the bandage, an alternating discrete electric field is generated by a wearable nanogenerator by converting mechanical displacement from skin movements into electricity. Rat studies demonstrated rapid closure of a full-thickness rectangular skin wound within 3 days as compared to 12 days of usual contraction-based healing processes in rodents...
November 29, 2018: ACS Nano
Jihoon Chung, Hyungseok Yong, Haksung Moon, Quang Van Duong, Seung Tae Choi, Dongseob Kim, Sangmin Lee
With the rise of portable and wearable electronics, a fast-charging, long-lasting power solution is needed; thus, there are attempts to harvest energy from the ambient environment. Mechanical energy harvesting through piezoelectric and triboelectric nanogenerators (PENG and TENG) is a promising approach due to their light weight, low cost, and high-power density in comparison to other technologies. Both types of generators are capable of charging portable and smart devices on their own by converting mechanical energy into electricity...
November 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Yanqin Yang, Lingjie Xie, Zhen Wen, Chen Chen, Xiaoping Chen, Aiming Wei, Ping Cheng, Xinkai Xie, Xuhui Sun
To meet the urgent demand for rapid advancement of wearable electronics, challenges are still remained in developing wearable and sustainable power sources with simple fabrication and low cost. In this work, we demonstrate a flexible and coaxial fiber by fabricating one dimensional triboelectric nanogenerator (TENG) outside and supercapacitor (SC) inside, which can not only harvest mechanical energy but also store energy in all-in-one fiber. In such coaxial fiber, carbon fiber bundles are utilized as the electrode material for TENG as well as the active and electrode material for SC...
November 21, 2018: ACS Applied Materials & Interfaces
Kuntal Maity, Samiran Garain, Karsten Henkel, Dieter Schmeißer, Dipankar Mandal
Natural piezoelectric material is of increasing interest particularly for applications in biocompatible, implantable, and flexible electronic devices. In this paper we introduce a cost effective, easily available natural piezoelectric material, i.e., sugar in the field of wearable piezoelectric nanogenerator (PNG) where low electrical output, biocompatibility and performance durability are still critical issues. We report on a high performance piezo-organic nanogenerator (PONG) based on the hybridization of sugar encapsulated polyvinylidene fluoride (PVDF) nanofiber webs (SGNFW)...
November 20, 2018: ACS Applied Materials & Interfaces
Zhiyuan Zhu, Kequan Xia, Zhiwei Xu, Haijun Lou, Hongze Zhang
A disposable and ecofriendly starch paper was used to fabricate a triboelectric nanogenerator (TENG) for the sensing of human perspiration. Using cost-effective and commercially accessible materials, the starch paper-based TENG (S-TENG) can be achieved through a rapid and simple fabrication method. The output performance varies with the absorbed water content, which can be utilized for human perspiration sensing. The starch structure can be broken down in water within 4 min. The proposed S-TENGs have a considerable potential in the field of green wearable electronics...
November 16, 2018: Nanoscale Research Letters
Kwangseok Lee, Jeong-Won Lee, Kihwan Kim, Donghyeon Yoo, Dong Sung Kim, Woonbong Hwang, Insang Song, Jae-Yoon Sim
Water waves are a continuously generated renewable source of energy. However, their random motion and low frequency pose significant challenges for harvesting their energy. Herein, we propose a spherical hybrid triboelectric nanogenerator (SH-TENG) that efficiently harvests the energy of low frequency, random water waves. The SH-TENG converts the kinetic energy of the water wave into solid⁻solid and solid⁻liquid triboelectric energy simultaneously using a single electrode. The electrical output of the SH-TENG for six degrees of freedom of motion in water was investigated...
November 15, 2018: Micromachines
Jun Li, Lei Kang, Yin Long, Hao Wei, Yanhao Yu, Yizhan Wang, Carolina A Ferreira, Guang Yao, Ziyi Zhang, Corey Carlos, Lazarus German, Xiaoli Lan, Weibo Cai, Xudong Wang
In vivo biomechanical energy harvesting by implanted nanogenerators (i-NGs) is promising for self-powered implantable medical devices (IMDs). One critical challenge to reach practical applications is the requirement of continuous direct-current (dc) output, while the low-frequency body activities typically generate discrete electrical pulses. Here, we developed an ultrastretchable micrograting i-NG system that could function as a battery-free dc micro-power supply. Packaged by a soft silicone elastomer with a cavity design, the i-NG exhibited an ultralow Young's modulus of ∼45 kPa and a high biocompatibility to soft biological tissues...
November 29, 2018: ACS Applied Materials & Interfaces
Jihoon Chung, Deokjae Heo, Banseok Kim, Sangmin Lee
Energy harvesting is a method of converting energy from ambient environment into useful electrical energy. Due to the increasing number of sensors and personal electronics, energy harvesting technologies from various sources are gaining attention. Among energy-harvesting technologies, triboelectric nanogenerator (TENG) was introduced as a device that can effectively generate electricity from mechanical motions by contact-electrification. Particularly, liquid-solid contact TENGs, which use the liquid itself as a triboelectric material, can overcome the inevitable friction wear between two solid materials...
November 13, 2018: Micromachines
Smita Chaturvedi, Sachin Kumar Singh, Priyank Shyam, Mandar M Shirolkar, Swathi Krishna, R Boomishankar, Satishchandra Ogale
In multiferroic LuFeO3 the hexagonal (-h) phase is an intermediate metastable phase encountered during the amorphous to orthorhombic (-o) transformation and is ferroelectric in nature. Thus far it has only been stabilized in a substrate-supported few layered ultrathin film form. Herein we show that the surface-induced strain field intrinsically present in nano-systems can self-stabilize this phase and the hexagonal to orthorhombic phase constitution ratio depends on the shape of the nanomaterial. Thus, nanoparticles (nanofibres) strain-stabilize the o : h ratio of about 75 : 25 (23 : 77)...
December 7, 2018: Nanoscale
Jin Pyo Lee, Jae Won Lee, Jeong Min Baik
Ever since a new energy harvesting technology, known as a triboelectric nanogenerator (TENG), was reported in 2012, the rapid development of device fabrication techniques and mechanical system designs have considerably made the instantaneous output power increase up to several tens of mW/cm². With this innovative technology, a lot of researchers experimentally demonstrated that various portable/wearable devices could be operated without any external power. This article provides a comprehensive review of polyvinylidene fluoride (PVDF)-based polymers as effective dielectrics in TENGs for further increase of the output power to speed up commercialization of the TENGs, as well as the fundamental issues regarding the materials...
October 20, 2018: Micromachines
Hyun-Woo Park, Nghia Dinh Huynh, Wook Kim, Hee Jae Hwang, Hyunmin Hong, KyuHyeon Choi, Aeran Song, Kwun-Bum Chung, Dukhyun Choi
Triboelectric nanogenerators (TENGs) are used as self-power sources for various types of devices by converting external waves, wind, or other mechanical energies into electric power. However, obtaining a high-output performance is still of major concern for many applications. In this study, to enhance the output performance of polydimethylsiloxane (PDMS)-based TENGs, highly dielectric TiO2-x nanoparticles (NPs) were embedded as a function of weight ratio. TiO2-x NPs embedded in PDMS at 5% showed the highest output voltage and current...
August 17, 2018: Micromachines
Yongshan Hu, Qiuqin Yue, Shan Lu, Dongchen Yang, Shuxin Shi, Xiaokun Zhang, Hua Yu
In order to solve the limited life problem of typical battery power supply, a self-powered method that is based on the environmental energy harvesting has emerged as an amazing power supply approach. The Tribo-electric-Nano-generator (TENG) has been widely studied because of its high efficiency, low fabrication cost, and high output voltage. However, low output power conversion efficiency has restricted its practical application because of its own extremely high output impedance. In order to match the high output impedance of TENG and increase the output power, this paper presents an adaptable interface conditioning circuit, which is composed of an impedance matching circuit, a synchronous rectifier bridge, a control circuit, and an energy storage device...
March 1, 2018: Micromachines
Sung-Ho Shin, Daehoon Park, Joo-Yun Jung, Pangun Park, Junghyo Nah
For the development of high performance triboelectric generators (TENGs), it is required to have facile methods to adjust the triboelectric properties of the friction surfaces. In this work, we present the surface charge density modulation of the photopolymer-ferroelectric nanoparticle composite surface by applying ultraviolet (UV) and electric field. By using the photopolymer, the triboelectric surface property was modulated by exposure to UV. In addition, lithographic surface patterning can be easily adopted to enlarge the frictional surface area as well...
December 7, 2018: Nanoscale
Dong Wook Kim, Sang-Woo Kim, Unyong Jeong
It is familiar to everyone that human skin and hair easily lose electrons and cause static electricity as they undergo friction with other materials. Such natural regenerative substances take a high ranking in the triboelectric series. Even though the static electricity of regenerative natural substances has been a long-term curiosity in human history, it is not yet clear which of their components causes the positive static charges. This study reveals that lipid layers on the surface of regenerative substances (skin, hair, leaves, cells) and even synthetic lipids are responsible for this positive static electricity and shows that it is possible to manufacture lipid-based triboelectric nanogenerators (TENGs)...
November 2, 2018: Advanced Materials
Jian Song, Libo Gao, Xiaoming Tao, Lixiao Li
Wearable triboelectric nanogenerators (TENGs) have attracted interest in recent years, which demand highly flexible, scalable, and low-cost features. Here, we report an ultra-flexible, large-scale and textile-based TENG (T-TENG) for scavenging human motion energy. The triboelectric layer was derived from the polydimethylsiloxane (PDMS) film with a cost-effective paper-induced rough surface via a facile doctor-blending technology. Ag-coated chinlon fabric (ACF) with ultra-flexible, large-scale and conductive characteristics was used as the electrode...
October 29, 2018: Materials
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