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Author: search.filters.author.Vittayakorn, WanwilaiSubject: search.filters.subject.Triboelectric nanogenerator

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    Simple Method for Enhancing Performance of the Bacterial Cellulose-Based Triboelectric Nanogenerator by Adding Conductive Interlayer
    (2023-01-01)
    Sriphan, Saichon
    ;
    Pharino, Utchawadee
    ;
    Pakawanit, Phakkhananan
    ;
    Bongkarn, Theerachai
    ;
    Vittayakorn, Wanwilai
    Surface charge density is a key factor that greatly enhances the performance of a natural-based triboelectric nanogenerator (TENG), which is essential for future sustainable sensing and harvesting devices. This work introduced a conductive interlayer between a main frictional layer and electrode. This approach can suppress the charge recombination rate and improve the amount of charges produced during the triboelectrification process. Bacterial cellulose (BC) film was selected as a main frictional layer for the TENG. A conductive nanomaterial, i.e. silver flake, was incorporated into the BC film as an intermediate layer for enhancing TENG performance. As firstly reported, the maximum electrical outputs for the multi-layer BC structure could be found when using silver flake/BC composite (ratio 1:5) as an intermediate layer, which has 122 V and 8.2 µA of output voltage and current, respectively. This is higher than the output voltage and current of a single layer BC TENG by approximately 3 and 8 times, respectively. The maximum output power of ∼440 µW is achieved by connecting with a load resistor of ∼10 MΩ. This demonstrates an efficient strategy for designing a high performance energy harvester by adding an intermediate layer for the target of practical purposes in sustainable systems.
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    Simple enhanced charge density of chitosan film by the embedded ion method for the flexible triboelectric nanogenerator
    (2022-12-01)
    Charoonsuk, Thitirat
    ;
    Supansomboon, Supitcha
    ;
    Pakawanit, Phakkhananan
    ;
    Vittayakorn, Wanwilai
    ;
    Pongampai, Satana
    This research proposed a simple ionic embedded method to improve electrical output performance by adding surface charges of cationic chitosan (CS) biopolymer for compatible utilization of the triboelectric nanogenerator (TENG). By simply embedding cationic salts, the TENG performance was enhanced by over four times more than that with pristine CS. Moreover, by modifying roughness on the film surface, the optimized condition of R-CS/3 %CaCl<inf>2</inf> reached the highest V<inf>OC</inf> and I<inf>SC</inf> of ~149 V and ~15 μA, respectively, thus exceeding the output from pristine R-CS TENG by four- and three times of ⁓38 V and ⁓5.1 μA. The maximum power output of 400 μW/cm<sup>2</sup> can be observed at the 10 MΩ external load resistance. Finally, by integrating an automatic self-charge pumping (ASCP) module, the ASCP/CS-TENG provided highly efficient V<inf>OC</inf> and I<inf>SC</inf> output power by over 1.3 times more than the R-CS/3 %CaCl<inf>2</inf> TENG and could light up 72 light emitting diodes (LEDs) easily.
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    Triboelectric-piezoelectric hybrid nanogenerator based on BaTiO3-Nanorods/Chitosan enhanced output performance with self-charge-pumping system
    (2021-03-01)
    Pongampai, Satana
    ;
    Charoonsuk, Thitirat
    ;
    Pinpru, Nattapong
    ;
    Pulphol, Phieraya
    ;
    Vittayakorn, Wanwilai
    Recent advances in achieving flexible triboelectric nanogenerators (TENGs) focus widely on utilizing and modifying abundant natural biopolymer. Boosting power generation and conversion efficiency continue to prevail. In this work, three main strategies were proposed to enhance the output performance of chitosan-based TENGs; 1) hybridization with lead-free piezoelectric nanorod, 2) introduction of a soft electrode using bacterial cellulose/carbon nanotube composite to enhance contact efficiency, and 3) enhancement of charge density of the triboelectric friction layer using a self-charge pumping (SCP) module. Under the same testing conditions of 48 ± 5% relative humidity, ~0.55 Hz of frequency, ~250 N of compressive force at 25.0 ± 0.5 °C, and the combination of 7 wt% lead-free piezoelectric BaTiO<inf>3</inf> nanorods (BT-NRs) in the chitosan matrix, the highest open-circuit voltage (V<inf>oc</inf>) of ~111.4 V, short circuit (I<inf>sc</inf>) of ~21.6 μA/cm<sup>2</sup>, and also output power density of 756 μW/cm<sup>2</sup> was achieved. By using an integrated SCP module, the TENGs can provide a V<inf>oc</inf>, I<inf>sc</inf> and peak power output of 247.2 V, 36.7 μA/cm<sup>2</sup> and 1568 μW/cm<sup>2</sup>, respectively. This electrical power output rises to over 4-fold more power enhancement than that of pristine chitosan TENGs. The TENGs demonstrate remarkable mechanical stability and reliability upon cyclical contact for up to 3000 times. This work provides a promising strategy for achieving high-output, eco-friendly triboelectric nanogenerators. By boosting the output performance via continuous charge pumping, ultrahigh effective charge density was achieved successfully in flexible chitosan/BT-NR biocomposites that can push output performance towards real applications of TENGs.