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<p>The rapid development of sustainable green energy, which often generates fluctuating electrical signals, has driven the demand for high-performance filter capacitors in alternating/direct current conversion. Replacing bulky aluminum electrolytic capacitors with electric double-layer capacitors (EDLCs) holds promise for electronics miniaturization. However, EDLCs face a trade-off between charge storage ability and ion/electron transport speed. Here, we demonstrate three-dimensional Y-branched carbon tube (3D-YCT) grids with a hierarchically porous structure as electrodes for line-filtering EDLCs. The branching patterns and positions within the 3D-YCT are precisely tailored through the nanochannels inside anodic aluminum oxide templates. These integrated 3D Y-branched CT arrays provide unobstructed pathways for fast frequency response and extensive surfaces for high capacitance. The resulting 3D-YCT-based EDLC achieves a desirable specific areal capacitance (<i>C</i><sub>A</sub>) of 3.6 mF cm<sup>−2</sup> with a phase angle of −80° at 120 Hz, outperforming most reported line-filtering EDLCs and demonstrating excellent line-filtering performance. These findings offer valuable insights for constructing miniaturized filter capacitors.</p>

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Hierarchically porous 3D Y-branched carbon tube grids for high-performance filter capacitors

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Gan Chen,
  • Fangming Han,
  • Guowen Meng,
  • Bingqing Wei

摘要

The rapid development of sustainable green energy, which often generates fluctuating electrical signals, has driven the demand for high-performance filter capacitors in alternating/direct current conversion. Replacing bulky aluminum electrolytic capacitors with electric double-layer capacitors (EDLCs) holds promise for electronics miniaturization. However, EDLCs face a trade-off between charge storage ability and ion/electron transport speed. Here, we demonstrate three-dimensional Y-branched carbon tube (3D-YCT) grids with a hierarchically porous structure as electrodes for line-filtering EDLCs. The branching patterns and positions within the 3D-YCT are precisely tailored through the nanochannels inside anodic aluminum oxide templates. These integrated 3D Y-branched CT arrays provide unobstructed pathways for fast frequency response and extensive surfaces for high capacitance. The resulting 3D-YCT-based EDLC achieves a desirable specific areal capacitance (CA) of 3.6 mF cm−2 with a phase angle of −80° at 120 Hz, outperforming most reported line-filtering EDLCs and demonstrating excellent line-filtering performance. These findings offer valuable insights for constructing miniaturized filter capacitors.