Photo-supercapacitors based on nanoscaled ZnO

Altaf, Çiğdem Tuc and Coşkun, Özlem and Kumtepe, Alihan and Rostas, Arpad Mihai and Iatsunskyi, Igor and Coy, Emerson and Erdem, Emre and Sankir, Mehmet and Sankir, Nurdan Demirci (2022) Photo-supercapacitors based on nanoscaled ZnO. Scientific Reports, 12 (1). ISSN 2045-2322

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In this study, zinc oxide (ZnO) powders in two different morphologies, nanowire (NW) and nanoflower (NF), have been synthesized by the hydrothermal method. The eligibility of the pristine ZnO nanopowders as a photo-active material has been revealed by designing P-SC devices via the facile drop-casting method on both glass and plastic substrates in large-area applications. The impact of physical properties and especially defect structures on photo-supercapacitor (P-SC) performance have been explored. Although the dark Coulombic efficiency (CE%) of both NW and NF-based P-SC were very close to each other, the CE% of NW P-SC increased 3 times, while the CE% of NF P-SC increased 1.7 times under the UV-light. This is because the charge carriers produced under light excitation, extend the discharge time, and as confirmed by electron paramagnetic resonance, photoluminescence, and transmission electron microscopy analyses, the performance of P-SCs made from NF powders was relatively low compared to those produced from NW due to the high core defects in NF powders. The energy density of 78.1 mWh kg−1 obtained for NF-based P-SCs is very promising, and the capacitance retention value of almost 100% for 3000 cycles showed that the P-SCs produced from these materials were entirely stable. Compared to the literature, the P-SCs we propose in this study are essential for new generation energy storage systems, thanks to their ease of design, adaptability to mass production for large-area applications, and their ability to store more energy under illumination.
Item Type: Article
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Emre Erdem
Date Deposited: 20 Aug 2022 16:56
Last Modified: 20 Aug 2022 16:56

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