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<p>Developing functional solid polymer electrolytes (SPEs) is crucial for flexible, lightweight, and portable supercapacitors. This work presents an electrospinning approach to fabricate SPEs using poly(vinyl alcohol)-sodium chloride (PVA-NaCl) nanofibers (PNNF). CuNi<sub>2</sub>O<sub>3</sub> nanoparticles deposited on nitrogen-doped omnichannel carbon nanofibers (CuNi<sub>2</sub>O<sub>3</sub>@N-OCCFs), coated onto a carbon cloth (CC), serve as the positive electrode, enhancing faradaic capacitance. Meanwhile, the rationally designed N-OCCFs, also coated onto CC, function as the negative electrode, providing a high-surface-area, and facilitating rapid electron transport. Comprehensive characterization revealed insights into the morphology and chemical composition of both electrodes and the PNNF electrolyte. An all-solid-state asymmetric flexible supercapacitor (AFSC) device, CuNi<sub>2</sub>O<sub>3</sub>@N-OCCFs-1.5//N-OCCFs-1.5, was assembled using PNNF as both the electrolyte and separator and evaluated against devices employing gel and aqueous electrolytes. The PNNF electrolyte enabled a wider potential window (2.2&#xa0;V) compared to gel (2.0&#xa0;V) and liquid (1.8&#xa0;V) electrolytes. The AFSC achieved an impressive energy density of 63.6 Wh kg<sup>−1</sup> at a power density of 1100 W kg<sup>−1</sup>, with 96.2% capacitance retention after 6000 charge/discharge cycles at 10 A g⁻<sup>1</sup>. When two devices were connected in series, they powered a red LED for 5.33&#xa0;min and a blue LED for 1.43&#xa0;min, demonstrating practical applicability. This study provides a simple and effective strategy for fabricating high-energy–density AFSCs with excellent cycling stability and broad potential for flexible electronics.</p> Graphical Abstract <p></p>

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Enhanced voltage and capacitance in flexible supercapacitors using electrospun nanofiber electrolytes and CuNi2O3@N-Doped omnichannel carbon electrodes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月29日

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  • Ponnaiah Sathish Kumar,
  • Jihoon Bae,
  • Jong Wook Roh,
  • Yuho Min,
  • Sungwon Lee

摘要

Developing functional solid polymer electrolytes (SPEs) is crucial for flexible, lightweight, and portable supercapacitors. This work presents an electrospinning approach to fabricate SPEs using poly(vinyl alcohol)-sodium chloride (PVA-NaCl) nanofibers (PNNF). CuNi2O3 nanoparticles deposited on nitrogen-doped omnichannel carbon nanofibers (CuNi2O3@N-OCCFs), coated onto a carbon cloth (CC), serve as the positive electrode, enhancing faradaic capacitance. Meanwhile, the rationally designed N-OCCFs, also coated onto CC, function as the negative electrode, providing a high-surface-area, and facilitating rapid electron transport. Comprehensive characterization revealed insights into the morphology and chemical composition of both electrodes and the PNNF electrolyte. An all-solid-state asymmetric flexible supercapacitor (AFSC) device, CuNi2O3@N-OCCFs-1.5//N-OCCFs-1.5, was assembled using PNNF as both the electrolyte and separator and evaluated against devices employing gel and aqueous electrolytes. The PNNF electrolyte enabled a wider potential window (2.2 V) compared to gel (2.0 V) and liquid (1.8 V) electrolytes. The AFSC achieved an impressive energy density of 63.6 Wh kg−1 at a power density of 1100 W kg−1, with 96.2% capacitance retention after 6000 charge/discharge cycles at 10 A g⁻1. When two devices were connected in series, they powered a red LED for 5.33 min and a blue LED for 1.43 min, demonstrating practical applicability. This study provides a simple and effective strategy for fabricating high-energy–density AFSCs with excellent cycling stability and broad potential for flexible electronics.

Graphical Abstract