ACS Omega
·
2020
·
IF 2.87
Yingxi Wang,Wenluan Zhang,Qiangqiang Sun,Shiji Lin,Sheng Sun,Xu Deng
Water droplets are usually charged positively via either electrospray or contact electrification at the solid/liquid interface. Herein, we describe a facile two-step strategy to generate charged droplets with desired polarities. In particular, negatively charged droplets can be generated via electrostatic induction using a precharged superamphiphobic substrate as an electret. The interplay of repulsive and attractive interactions between like- and unlike-charged droplets or electret leads to rapid droplet transport and self-assembly of specific highly ordered arrays.
研究领域:
材料科学
·
界面化学
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 21
·2300529
·
IF 27.8
Haobin Wang,Shuyi Huang,Haoze Kuang,Chi Zhang,Yulu Liu,Kaihang Zhang,Xinyu Cai,Xiaozhi Wang,Jikui Luo,Zhong Lin Wang
Triboelectrification for contacts between three types of materials—metals, polymers, and semiconductors—are investigated. The results show that triboelectrification is a charge exchange process between the surfaces of two friction materials, and its output is the synergetic effects of the electrostatic induction (ESI) and dynamic junction modulation (DJM). There are four current/voltage peaks in output of triboelectrification: two of them are attributed to the ESI effect and determined by the surface state densities and electron affinity difference of the materials, while the other two are associated with the DJM effect and determined by the charging exchange between the surface states and the depletion region. However, metals and polymers have no-modulation of depletion region due to their high conductivity and insulating nature, respectively, thus only two peaks induced by the ESI effect are observable no matter what types of metals and polymers are in pair for contacting. Semiconductors have a depletion region, there will be two more output current/voltage peaks induced by the junction modulation when a semiconductor is in contact with any type of materials. The observations reveal a universal triboelectrification mechanism for contacts between materials, and provide an intuitive guidance for the development of high-performance triboelectric nanogenerators.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Luxian Li,Xuemei Li,Xiao Yu,Chun Shen,Xiang Wang,Baowen Li,Jidong Li,Lifeng Wang,Jun Yin,Wanlin Guo
Droplets energy harvesters(DEHs) have attracted tremendous attention and shown great potential in harvesting energy from falling water. Current approaches to enhance the device output through adapting a top-electrode in direct contact with the droplets face the drawbacks of fixed droplet-imping-location and inevitable electrode corrosion. Herein, we proposed an easy but effective way to boost the performance of bottom-electrode DEHs through adapting a partial-electrode configuration. It was found that droplets impinging at the boundary between a blank region and the electrode region, instead of at the electrode region, could improve the output peak voltage and current by more than one order of magnitude, up to 30 V. The mechanism is contributed to that water across the boundary bridges the blank and the electrode region for notable inter-region charge transfer, leading to an enhanced electrostatic induction. The induced peak current is proven to be proportional to the changing rate of droplet area on top of the electrode upon initial overlap, and inversely proportional to the thickness of the polymer film in our test range . Based on these findings, DEH with a branched electrode is designed to harvest energy from falling droplets of random positions, as well as energy from turbulent flow of time-variant shapes with an output voltage up to one hundred volts.
研究领域:
能源材料
·
物理学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Xuemei Li,Xiaoyu Ning,Luxian Li,Xiang Wang,Baowen Li,Jidong Li,Jun Yin,Wanlin Guo
Harvesting energy from raindrops has attracted extensive efforts due to the wide distribution of precipitation and vast potential applications. Among the various approaches developed for this purpose, droplets-based electricity generators (DEGs) based on electrostatic induction have been becoming an outstanding option in the aspect of output voltage and instantaneous power density. Performance dependence of DEGs on the device configuration and the dominating factors have to be revealed for the further optimization. Here, we comprehensively investigated the performance of DEGs with three different configurations, i.e . , bottom-electrode, top-electrode and double-electrode, and found that water-to-ground capacitance played an important role in determining the device output. Besides, the conductivity of water shows notable influence on the device performance, tap water with a conductivity around 300 μS/cm shows the highest efficiency in our measurements. Adapting an optimized power management circuit, the pulsed-like output of DEGs is converted to a constant voltage output of variable amplitudes, which is successfully used to charge a smart phone. Our results shed light on possible ways to further optimize the DEG configuration and their potential applications.
研究领域:
能源材料
·
纳米能源
·
环境能量采集
·
电力电子
·
功能器件
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Dongcheng Wu,Wenjie Yan,Xin Zhang,Jicai Zhang,Ting Liu,Zenghui Qiu,Yangqi Zhang,Xinmiao Liu,Shuwei Zhang,Haijun Xu
The induction electrode plays a critical role in determining triboelectric nanogenerator (TENG) performance through electrostatic induction. However, traditional fabrication methods involving metal tape adhesion face inherent limitations: i. The adhesive layer increases induction distance (which is inversely proportional to maximum surface charge density), consequently reducing output; ii. Their susceptibility to inelastic deformation prevents reliable operation under flexible/elastic strain required by wearable devices. To address these challenges, we developed a novel in-situ photocatalytic method for synthesizing silver nanoparticle (AgNPs) electrodes. Achievable even with ambient sunlight, this simple synthesis process can be accelerated to 1 min using high-power illumination. This method eliminates the adhesive layer required by traditional electrodes, enabling exceptional flexibility, stability, and adaptability. Free from expensive instruments, our low-cost method achieves 187 % enhanced output over traditional electrodes, rivaling magnetron-sputtered electrodes. The AgNPs electrode hybridized with minimal silver nanowires (AgNWs) exhibits superior resistance stability compared to the pure AgNWs electrode, using only 2.5 % AgNWs nano-material. Benefiting from the structural merits of AgNPs and their hybrid architecture, the developed electrodes achieve good flexibility and elastic strain performance. These advancements demonstrate the high potential of AgNPs induction electrodes for high-performance TENGs and wearable applications.
研究领域:
纳米技术
·
能量收集
·
柔性电子学
·
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Nie Jinhui,Wang Ziming,Ren Zewei,Li Shuyao,Chen Xiangyu,Lin Wang Zhong
Triboelectric nanogenerators are an energy harvesting technology that relies on the coupling effects of contact electrification and electrostatic induction between two solids or a liquid and a solid. Here, we present a triboelectric nanogenerator that can work based on the interaction between two pure liquids. A liquid–liquid triboelectric nanogenerator is achieved by passing a liquid droplet through a freely suspended liquid membrane. We investigate two kinds of liquid membranes: a grounded membrane and a pre-charged membrane. The falling of a droplet (about 40 μL) can generate a peak power of 137.4 nW by passing through a pre-charged membrane. Moreover, this membrane electrode can also remove and collect electrostatic charges from solid objects, indicating a permeable sensor or charge filter for electronic applications. The liquid–liquid triboelectric nanogenerator can harvest mechanical energy without changing the object motion and it can work for many targets, including raindrops, irrigation currents, microfluidics, and tiny particles.
研究领域:
纳米技术
·
能源工程
·
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Chan Wang,Xuecheng Qu,Qiang Zheng,Ying Liu,Puchuan Tan,Bojing Shi,Han Ouyang,Shengyu Chao,Yang Zou,Chaochao Zhao,Zhuo Liu,Yusheng Li,Zhou Li
Assessment of muscle function is an essential indicator for estimating elderly health, evaluating motor function, and instructing rehabilitation training, which also sets urgent requirements for mechanical sensors with superior quantification, accuracy, and reliability. To overcome the rigidity and vulnerability of traditional metallic electrodes, we synthesize an ionic hydrogel with large deformation tolerance and fast self-healing ability. And we propose a stretchable, self-healing, and skin-mounted (Triple S) active sensor (TSAS) based on the principles of electrostatic induction and electrostatic coupling. The skin modulus-matched TSAS provides outstanding sensing properties: maximum output voltage of 78.44 V, minimal detection limit of 0.2 mN, fast response time of 1.03 ms, high signal-to-noise ratio and excellent long-term service stability. In training of arm muscle, the functional signals of biceps and triceps brachii muscles as well as the joint dexterity of bending angle can be acquired simultaneously through TSAS. The signal can also be sent wirelessly to a terminal for analysis. With the characteristics of high sensitivity, reliability, convenience, and low-cost, TSAS shows its potential to be the next-generation procedure for real-time assessment of muscle function and rehabilitation training.
研究领域:
生物医学工程
·
材料科学
·
传感器与执行器
·
康复工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Liu Ying,Wang Chan,Liu Zhuo,Qu Xuecheng,Gai Yansong,Xue Jiangtao,Chao Shengyu,Huang Jing,Wu Yuxiang,Li Yusheng,Luo Dan,Li Zhou
Ionically conductive fibers have promising applications; however, complex processing techniques and poor stability limit their practicality. To overcome these challenges, we proposed a stress-induced adaptive phase transition strategy to conveniently fabricate self-encapsulated hydrogel-based ionically conductive fibers (se-HICFs). se-HICFs can be produced simply by directly stretching ionic hydrogels with ultra-stretchable networks (us-IHs) or by dip-drawing from molten us-IHs. During this process, stress facilitated the directional migration and evaporation of water molecules in us-IHs, causing a phase transition in the surface layer of ionic fibers to achieve self-encapsulation. The resulting sheath-core structure of se-HICFs enhanced mechanical strength and stability while endowing se-HICFs with powerful non-contact electrostatic induction capabilities. Mimicking nature, se-HICFs were woven into spider web structures and camouflaged in wild environments to achieve high spatiotemporal resolution 3D depth-of-field sensing for different moving media. This work opens up a convenient route to fabricate stable functionalized ionic fibers.
研究领域:
材料科学
·
电气工程
·
传感技术
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）