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<p>The supercapattery integrates the rapid power output of supercapacitors (SCs) with the substantial energy storage capacity typical of batteries. Metal-organic frameworks (MOFs) offer a stable porous structure that enhances efficient ion transport through strong metal-organic linkages. Metal diselenides contribute high conductivity and stability, strengthening the composite’s energy and power densities. Polyaniline (PANI) provides pseudocapacitive behavior, further improving charge storage. This study presents a PCN-222/NiSe<sub>2</sub>@PANI composite synthesized hydrothermal, ensuring strong material integration and uniform distribution. Surface morphology and phase purity, analyzed by SEM and XRD, confirmed structural uniformity and stability. Electrochemical testing revealed a specific capacity (Qs) of 2449 ± 5&#xa0;C/g at 2.0&#xa0;A/g in a tri-electrode configuration. A two-electrode supercapattery, fabricated using PCN-222/NiSe<sub>2</sub>@PANI as the anode and activated carbon (AC) as the cathode, achieved an energy density of 68 Wh/kg and a power density of 900&#xa0;W/kg, with 87.6% capacity retention over 8,000 GCD cycles, surpassing standard benchmarks. The power-law analysis yielded <i>b</i>-fitting values between 0.58 and 0.75, indicating hybrid charge storage. The composite exhibited promising hydrogen evolution reaction (HER) activity, with an overpotential of 87 ± 5 mV and a Tafel slope of 78 ± 5 mV/dec, showing high catalytic efficiency and favorable charge transfer kinetics. These results position PCN-222/NiSe<sub>2</sub>@PANI as a strong contender for high-performance supercapattery applications, advancing energy storage and conversion technologies.</p>

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Hierarchical nanostructuring of PCN-222/NiSe2@PANI composites for enhanced electrochemical performance in supercapattery and hydrogen evolution reaction applications

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Muhammad Zeeshan,
  • Soumaya Gouadria,
  • Fatma Alharbi,
  • M. Waqas Iqbal,
  • Muhammad Arslan Sunny,
  • Haseebul Hassan,
  • N. A. Ismayilova,
  • Hussein Alrobei,
  • Yazen. M. Alawaideh,
  • Ehtisham Umar

摘要

The supercapattery integrates the rapid power output of supercapacitors (SCs) with the substantial energy storage capacity typical of batteries. Metal-organic frameworks (MOFs) offer a stable porous structure that enhances efficient ion transport through strong metal-organic linkages. Metal diselenides contribute high conductivity and stability, strengthening the composite’s energy and power densities. Polyaniline (PANI) provides pseudocapacitive behavior, further improving charge storage. This study presents a PCN-222/NiSe2@PANI composite synthesized hydrothermal, ensuring strong material integration and uniform distribution. Surface morphology and phase purity, analyzed by SEM and XRD, confirmed structural uniformity and stability. Electrochemical testing revealed a specific capacity (Qs) of 2449 ± 5 C/g at 2.0 A/g in a tri-electrode configuration. A two-electrode supercapattery, fabricated using PCN-222/NiSe2@PANI as the anode and activated carbon (AC) as the cathode, achieved an energy density of 68 Wh/kg and a power density of 900 W/kg, with 87.6% capacity retention over 8,000 GCD cycles, surpassing standard benchmarks. The power-law analysis yielded b-fitting values between 0.58 and 0.75, indicating hybrid charge storage. The composite exhibited promising hydrogen evolution reaction (HER) activity, with an overpotential of 87 ± 5 mV and a Tafel slope of 78 ± 5 mV/dec, showing high catalytic efficiency and favorable charge transfer kinetics. These results position PCN-222/NiSe2@PANI as a strong contender for high-performance supercapattery applications, advancing energy storage and conversion technologies.