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    Exploring liquid-solid interface based triboelectrification, structures, and applications
    (2024-12-01)
    Kaja, Kushal Ruthvik
    ;
    Hajra, Sugato
    ;
    Panda, Swati
    ;
    Belal, Mohamed A.
    ;
    Pharino, Utchawadee
    In recent years, there has been a quest to accelerate the search for efficient and sustainable energy harvesting technologies due to challenges from fossil fuel depletion and environmental concerns. There is also a continous demand for autonomous sensing in our growing connected world. The liquid-solid triboelectric nanogenerator (L-S TENG) has emerged as a viable alternative, notably for generating mechanical energy from water. Despite extensive study into liquid-solid contact electrification techniques, a significant need remains to improve energy harvesting efficiency in L-S TENG systems. This comprehensive analysis delves into recent advances in energy harvesting from water, with a particular emphasis on understanding the interaction dynamics between liquid-solid interfaces when using triboelectric nanogenerators for energy conversion. This review summarizes recent developments in the structural design and applications of liquid-solid triboelectrification, focusing on improving TENG output performance. In addition, new insights are provided on the potential impact and future technical hurdles facing L-S TENG technologies. By offering new insights into current knowledge and future research directions, this review aims to guide progress in the field of L-S TENG energy harvesting.
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    Influence of dispersed phase morphology on electrical and fatigue properties of BaTiO3/PDMS nanogenerator
    (2018-11-01)
    Sriphan, Saichon
    ;
    Nawanil, Chanisa
    ;
    Vittayakorn, Naratip
    A flexible piezoelectric nanogenerator (FPENG) was fabricated by incorporating barium titanate (BT) fibers and BT powders into polydimethylsiloxane (PDMS) matrix phase, also with an interdigital electrodes (IDEs). The electrospinning method was used to prepare BT fibers. Phase structure was carried out by the x-ray diffraction (XRD) technique. By using the Rietveld refinement method, a tetragonal structure of BT fiber could be confirmed. The scanning electron microscopy results showed a non-smooth surface of BT fibers, indicating the polymeric and organic precursors have been removed. The fabricated FPENG with 50% ratio of BT fibers was capable to generate an open-circuit voltage of ≈ 12 V and a short-circuit current of ≈ 1 μA. The effect of dispersed phases inside FPENG becomes the role to improve the output performance. This FPENG device can operate up to 5k times before degeneration. By continuously pressing up to 40k times, the output voltage tended to decrease reaching to a null value. The mechanical fatigue effect has been found that it related to the damage produced at the interface between IDEs and PDMS during pressing. The present results can be guided to further design the material and the device structure to obtain high-performance and stability of the FPENG devices.
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    Nanoheat source generated by leaky light mode within a nano-waveguide for small electrical power generator
    (2012-12-01)
    Kamoldilok, Surachart
    ;
    Yupapin, Preecha P.
    In this paper, we present a novel type of small electrical power generator controlled by the leaky light resonant modes or whispering gallery modes (WGMs) in a nano-waveguide, in which the nanowaveguide is designed and configured to be a nano-ring resonator. By using the Optiwave programming based on Finite Difference Time-Domain (FDTD) method, two types of InGaAsP/InP nanoring resonators are designed and simulated, which one is a single nanoring resonator, and the other is the double nanoring resonator. Simulation results obtained have shown that the leaky light resonant modes can be controlled by the ring radii variations, whereas the maximum resonant peak of the single nanoring resonator is observed at the ring radius of 1.55 μm, while the double nanoring resonator is occurred at the inner and outer ring radii of 0.775 μm and 1.55 μm, respectively. The maximum peak intensities of the single nanoring and double resonators are 1150 W/m<sup>2</sup> and 2740 W/m <sup>2</sup>, respectively. The efficiency of the fabricated generators was calculated, in which the efficiency of a proposed micro turbine engine of 2.4 kJ is noted. Finally, the use of the leaky light mode resonant peak of the center nanoring resonator for nanoelectrical power generator is discussed in details. © 2012 Elsevier Ltd. All rights reserved.
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