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<p>Tungsten trioxide (WO<sub>3</sub>) is considered to be a promising candidate for pseudocapacitive materials, due to its high theoretical capacitance and good electrical conductivity. Herein, the WO<sub>3</sub> electrodes of nanosheets grown on carbon cloth conductive substrates are successfully synthesized via a facile hydrothermal method. The influences of the acid–base of the reaction solution and hydrothermal reaction temperature on morphologies and electrochemical properties of the WO<sub>3</sub> electrodes are discussed. The WO<sub>3</sub>-150℃ electrode was obtained by hydrothermal heating at 150 ℃ and exhibited a high areal specific capacitance of 4.78 F·cm<sup>−2</sup> at 10&#xa0;mA·cm<sup>−2</sup>. In addition, it can be assembled into a symmetric flexible supercapacitor(WO<sub>3</sub>-150℃//WO<sub>3</sub>-150℃) which has been investigated in 5&#xa0;M LiCl aqueous electrolyte. After 5000 cycles, the capacitance retention of the device is always maintained at 100% without any loss, showing perfect capacitance stability.</p> Graphical abstract <p></p>

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Hydrothermal synthesis of tightly stacked two-dimensional WO3/CC electrodes for assembling high-performance flexible symmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Minghua Bai,
  • Caiwei Qin,
  • Rui Liu,
  • Jia Zhao,
  • Dianwei Cao,
  • Lei Wang,
  • Zhan Yu,
  • Yanhong Kang,
  • Zhen Zhao

摘要

Tungsten trioxide (WO3) is considered to be a promising candidate for pseudocapacitive materials, due to its high theoretical capacitance and good electrical conductivity. Herein, the WO3 electrodes of nanosheets grown on carbon cloth conductive substrates are successfully synthesized via a facile hydrothermal method. The influences of the acid–base of the reaction solution and hydrothermal reaction temperature on morphologies and electrochemical properties of the WO3 electrodes are discussed. The WO3-150℃ electrode was obtained by hydrothermal heating at 150 ℃ and exhibited a high areal specific capacitance of 4.78 F·cm−2 at 10 mA·cm−2. In addition, it can be assembled into a symmetric flexible supercapacitor(WO3-150℃//WO3-150℃) which has been investigated in 5 M LiCl aqueous electrolyte. After 5000 cycles, the capacitance retention of the device is always maintained at 100% without any loss, showing perfect capacitance stability.

Graphical abstract