Wide-temperature-range flexible micro-supercapacitors using liquid crystal gel electrolyte

Li, Min and Jia, Chen and Türker, Yurdanur and Özkaynak, Mert Umut and Zhao, Libo and Zhang, Danyu and Luo, Yunyun and Luo, Guoxi and Wang, Lu and Xia, Yong and Li, Zhikang and Zhu, Nan and Yang, Ping and Dönmez, Koray Bahadır and Boukherroub, Rabah and Jiang, Zhuangde (2023) Wide-temperature-range flexible micro-supercapacitors using liquid crystal gel electrolyte. ACS Applied Energy Materials, 6 (10). pp. 5230-5238. ISSN 2574-0962

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In this work, to construct a sunlight-powered energy storage system, single wall carbon nanotubes (SWCNTs)-based symmetric micro-supercapacitors (MSCs) were fabricated by a one-step, facile spraying method. The electrodes exhibited satisfactory conductivity with a sheet resistance of 275 Ω/sq. Moreover, potassium hydroxide-poly(vinyl alcohol) (KOH-PVA) and phosphoric acid-nonionic surfactant liquid crystal (PA-NI LC) gel electrolytes were prepared and applied to design all-solid-state MSC devices. Compared to the device assembled using the SWCNTs/KOH-PVA gel electrolyte, the SWCNTs/PA-NI LC electrolyte displayed larger areal capacitance with the largest recorded value of 11.0 mF·cm-2 at a current density of 0.08 mA·cm-2 at room temperature. Additionally, the effect of temperature on the MSC device performance was assessed, and the results revealed that the device based on the SWCNTs/PA-NI LC electrolyte achieved enhanced electrochemical performance at an operating temperature of 65 °C, including a large areal capacitance of 14.7 mF·cm-2 at 0.08 mA·cm-2, a better rate performance of 88% with 12.9 mF·cm-2 at 0.4 mA·cm-2, and a higher energy density of 2.04 μWh·cm-2 at a power density of 40.64 μW·cm-2. In addition, the MSC device featured high cyclic stability under bending conditions (45 or 90°) at room temperature. Furthermore, a sunlight-powered energy storage system was fabricated, combining solar cells with the as-assembled MSC devices. Three MSCs connected in series were charged by solar cells and further acted as the energy supply for a red light-emitting diode (LED), which could be continuously operated for 2 min 30 s. All of the findings herein represent a good indication of the promising practical application potential of the as-prepared MSC devices as energy storage devices at high temperatures.
Item Type: Article
Uncontrolled Keywords: energy storage system; liquid crystal gel electrolyte; micro-supercapacitors; spraying; wide temperature range
Divisions: Sabancı University Nanotechnology Research and Application Center
Depositing User: Yurdanur Türker
Date Deposited: 06 Aug 2023 22:25
Last Modified: 06 Aug 2023 22:25
URI: https://research.sabanciuniv.edu/id/eprint/47362

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