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Surface-Tension Induced High Packing Density Carbon Nanoribbons Film with Ultrahigh Volumetric Capacitance
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DOI：10.1039/D5EE02047F.png)
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Abstract
En 中文
For ultrafast-response supercapacitors; it is very challenging for typical porous carbon electrodes to exhibit both high volumetric (Cv) and areal (Ca) capacitances; especially under high rates; due to inefficient pore utilization. Here a surface-tension strategy is deployed to achieve high-density carbon electrodes by eliminating hollow voids; resulting in maximum densification and enhanced ion transport. Specifically; the hollow nanofibers transform into self-compressed nanoribbons with a volume shrinkage by 96.9%; an increase in elastic modulus by six times and electronic conductivity by eleven times. As a result; the volumetric capacitance of carbon nanoribbons (142 F cm−3) in an aqueous electrolyte largely exceeds those of the state-of the-art active carbon (62 F cm−3) and graphene film (41 F cm−3). At an extremely high power of 5 V s−1; the 200-μm-thick nanoribbon film maintains an areal capacitance of 0.68 F cm−2. Full devices in organic electrolyte deliver volumetric energies up to 18.9 Wh L−1; more than double that of commercial supercapacitors (5–8 Wh L−1) and other frontier ones. Additionally; 50 F soft-pack supercapacitors are fabricated to demonstrate their versatility in practical applications.
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