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

Key Points

• This research aims to develop a high-performance filter capacitor using a novel 3D carbon tube structure.
• Created Y-branched carbon tube grids with a hierarchically porous structure
• Systematically controlled parameters like branching algebra and anodization time
• Optimized height ratios of coarse and fine carbon tubes for enhanced performance.
• Achieved a high area-specific capacitance of 3.6 mF cm-2 at 120 Hz
• Maintained a phase angle of -80°
• Outperformed most existing filter double-layer capacitors.