Moving water droplets induced electricity on an electret surface with a charge gradient

Wang, Xiang; Hu, Tao; Wang, Xiao; Sheng, Han; Tan, Jin; Fang, Sunmiao; Deng, Wei; Li, Xuemei; Yin, Jun; Guo, Wanlin

doi:10.1016/j.nanoen.2023.108918

Cited by 4 publications

(2 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is noted that the injected charge could not remain stable. However, we believe that strategies including porous treatment, 29 coating films, 30 and so on have the potential to improve the stability of the surface charge gradient. In summary, our study led to a deep understanding of the conversion process through real-time testing of the lateral adhesive forces operating on the droplet during its power generation process through sliding.…”

Section: Strategy To Boost Energy Conversion Efficiencymentioning

confidence: 99%

See 1 more Smart Citation

Assessing the Mechanical-to-Electrical Energy Conversion Process of a Droplet Sliding on the Poly(tetrafluoroethylene) Surface

Hu,

Li,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Utilizing moving droplets to generate electricity has garnered significant attention due to its high output voltage and power. However, the understanding of energy dissipation and conversion processes during droplet movement remains limited, hindering the development of effective ways to further enhance the device's performance. In this study, we developed a method to simultaneously evaluate the input mechanical energy and output electrical energy while droplets slide on a poly-(tetrafluoroethylene) (PTFE) surface to assess the energy conversion process. The influences of ion concentration, droplet volume, and contact area with PTFE on the energy conversion efficiency were investigated, suggesting optimized parameters. Moreover, by introduction of an asymmetric electric field on the PTFE surface, the input mechanical energy can be significantly reduced. In combination with the enhanced electrical output originating from improved surface charge density, the energy conversion efficiency is improved by an order of magnitude from 0.61 to 9.08%. These results shed light on strategies to improve device performance based on moving droplets.

show abstract

Section: Strategy To Boost Energy Conversion Efficiencymentioning

confidence: 99%

Section: Strategy To Boost Energy Conversion Efficiencymentioning

confidence: 99%

Assessing the Mechanical-to-Electrical Energy Conversion Process of a Droplet Sliding on the Poly(tetrafluoroethylene) Surface

Hu,

Li,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

Dynamical Mechanism for Reaching Ultrahigh Voltages from a Falling Droplet

Zhang,

Tian,

Jiang

et al. 2024

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Recent experiments have demonstrated an extremely high output voltage of 260 V by impinging droplets on an electret surface with top and back electrodes. However, the mechanism underlying the generated high voltage remains elusive. Through high‐speed imaging of the impinging water droplet, it is found that the recorded voltage is proportional to the change rate of contact length l between the droplet and the top electrode over time, that is, dl/dt. By combining an electrostatic model with multi‐physics simulations, the time‐dependent charge distribution on the top electrode is analytically described as a function of several key factors pertaining to the spreading dynamics of droplet and the geometrical dimensions of device. These results show that the high voltage originates from the accumulation of charge in the spreading droplet and the ensuing instantaneous discharge upon high‐speed contact with the top electrode. Using the model‐optimized parameters, the experimentally generated voltage from a falling 64 µL droplet with a 2 mm salt can be boosted to 1030 V, giving rise to an energy conversion efficiency as high as 3.3%. This conversion efficiency will further increase by 14 times if the surface charge density of the electret can be enhanced to its limit using state‐of‐the‐art fabrication techniques.

show abstract

An enhanced electrokinetic system for remediation of Cu-polluted clay soils by integrating purging solutions and intermittent power

Diba,

Goodarzi,

Sobhanardakani

et al. 2024

Applied Clay Science

View full text Add to dashboard Cite

Moving water droplets induced electricity on an electret surface with a charge gradient

Cited by 4 publications

References 40 publications

Assessing the Mechanical-to-Electrical Energy Conversion Process of a Droplet Sliding on the Poly(tetrafluoroethylene) Surface

Assessing the Mechanical-to-Electrical Energy Conversion Process of a Droplet Sliding on the Poly(tetrafluoroethylene) Surface

Dynamical Mechanism for Reaching Ultrahigh Voltages from a Falling Droplet

An enhanced electrokinetic system for remediation of Cu-polluted clay soils by integrating purging solutions and intermittent power

Contact Info

Product

Resources

About