Studying the droplet sliding velocity and charge transfer at a liquid–solid interface

Wang, Xuejiao; Zhang, Jinyang; Liu, Xin; Lin, Shiquan; Wang, Zhong Lin

doi:10.1039/d2ta09797d

Cited by 32 publications

(17 citation statements)

References 42 publications

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“…[29] The formation of an electric double layer and the charge shielding effect caused by ions at the liquid-solid interface have been reported. [30] Specifically, during the initial contact, electron transfer occurs between the solution and the FEP, resulting in a negatively charged FEP surface. Subsequently, cations in the solution are moved to the negatively charged FEP surface, forming an electric double layer.…”

Section: Liquid-solid Electrification Mechanism Of Sucrose Solutionmentioning

confidence: 99%

Liquid–Solid Triboelectric Probes for Real‐Time Monitoring of Sucrose Fluid Status

Liu

Zou

et al. 2023

Adv Funct Materials

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Triboelectric probes have rapidly developed as an efficient tool for understanding contact electrification at liquid–solid interfaces. However, the liquid–solid electrification process is susceptible to interference from chemical components in mixed solutions, severely limiting the potential applications of triboelectric probes in various liquid environments. This study for the first time reports a triboelectric probe capable of sucrose solution concentration sensing, finding that the dissolution of sucrose destroys the hydrogen bond network between water molecules and forms sucrose–water hydrogen bonds, which alters the fluid mechanics characteristics of the solution and enhances its conductivity, thereby reducing the droplet size and causing an ion charge shielding effect that significantly affects the electron transfer in liquid–solid contact electrification. Owing to the feedback of the triboelectric probe on the sucrose concentration gradient‐type sensing electrical signals, efficient sensing of sucrose solution was achieved (sensitivity of −0.0038%−1, response time of 90 ms). The triboelectric probe is also used as a wireless smart terminal to enable real‐time detection of sucrose solution. This work contributes to the understanding of the structure–function relationship between micro hydrogen bonding and macro performance, and provides a promising solution for building sustainable intelligent sensors.

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Section: Liquid-solid Electrification Mechanism Of Sucrose Solutionmentioning

confidence: 99%

Liquid–Solid Triboelectric Probes for Real‐Time Monitoring of Sucrose Fluid Status

Liu

Zou

et al. 2023

Adv Funct Materials

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“…The droplet TENG converts the kinetic energy of the droplet into electricity by contact electrification effect and proper circuit connection. There were two mainstream views on the source of contact electrification between solids and liquids: one is based on the ion transfer mechanism of the double electron layer, − and the other is based on the electron transfer mechanism of contact electrification. − Recent studies have found that both ion transfer and electron transfer occur simultaneously during the process of contact electrification between solids and liquids and electron transfer plays a dominant role in the contact electrification process between deionized water and PTFE. − Therefore, in this paper, we mainly consider electron transfer as the dominant factor in contact electrification. A droplet after L-DTENG working was collected using a Faraday cup, the voltage of Faraday cup was measured during this process (Figure S6).…”

Section: Resultsmentioning

confidence: 99%

A Robust Droplet Triboelectric Nanogenerator with Self-Cleaning Ability Achieved by Femtosecond Laser

Zhang,

Yin,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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A droplet triboelectric nanogenerator (TENG) has great potential for harvesting the high entropy energy in water. Despite extensive research, it still suffers from low average power density, poor long-term stability, and insufficient flexibility. Here, a porous micronanostructured polytetrafluoroethylene (PTFE) with superhydrophobicity and self-cleaning ability, is generated by femtosecond laser direct processing. The droplet TENG with laser treated PTFE (LT-PTFE) dielectric layer (L-DTENG) can reach a higher output compared with the droplet TENG with a PTFE dielectric layer (P-DTENG). L-DTENG also demonstrated good long-term stability, self-cleaning ability, and flexibility, making it suitable for various applications, including those involving dust and sewage pollution, as well as bending and pressing conditions. Furthermore, a simulation of finite element method (FEM) and an equivalent circuit model are established to understand the working mechanism of L-DTENG. This multifunctional device and theoretical research provide a smart strategy to generate electricity in a complex environment and lay a solid foundation for droplet TENG applications on a large scale.

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“…Past research data has indicated that the introduction of ions may inhibit electron transfer, implying a competitive relationship between electrons and ions. [ 15a,16 ] Therefore, there might be mutual influences between electron transfer and ion absorption. When the ion concentration becomes excessively high, the output performance of D‐TENG may decline with the increase in ion concentration.…”

Section: Resultsmentioning

confidence: 99%

A New Single‐Electrode Generator for Water Droplet Energy Harvesting with A 3 mA Current Output

Meng,

Zhang,

Liu

et al. 2023

Advanced Energy Materials

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Triboelectric nanogenerators (TENGs) based on water droplets can harvest water kinetic energy using triboelectrification and electrostatic induction mechanisms. However, the development of traditional liquid–solid TENGs (L–S TENGs) is severely limited due to their low‐performance output and high device encapsulation requirements for preparation technology. In this work, a single‐electrode mode droplet‐based TENG (D‐TENG) is devised to effectively harvest water kinetic energy by optimizing the interface contact behavior of droplets, increasing the short‐circuit current (ISC) of one drop of water from microamperes to milliamperes levels. In the D‐TENG configuration, the electrode is positioned above the dielectric rather than at the bottom, allowing efficient utilization of generated friction charges and reducing the dissipation of these charges, thereby enhancing the output performance of the TENG. The influencing factors and operational mechanisms of D‐TENG are studied to obtain optimized working conditions to improve its output performance. Under optimal conditions, the D‐TENG can saturate the charge of the PTFE surface with only 8 droplets, achieving an ISC of up to 3.51 mA and an output voltage (VO) of 298.27 V. This work provides a convenient method for efficiently harvesting water kinetic energy based on interfacial behavior control.

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Studying the droplet sliding velocity and charge transfer at a liquid–solid interface

Abstract: The contact electrification between liquid and solid has attracted widespread attention from the field of energy, physics and chemistry, but its basic mechanism still remains unclear, especially for the charge...

Cited by 32 publications

References 42 publications

Liquid–Solid Triboelectric Probes for Real‐Time Monitoring of Sucrose Fluid Status

Liquid–Solid Triboelectric Probes for Real‐Time Monitoring of Sucrose Fluid Status

A Robust Droplet Triboelectric Nanogenerator with Self-Cleaning Ability Achieved by Femtosecond Laser

A New Single‐Electrode Generator for Water Droplet Energy Harvesting with A 3 mA Current Output

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