Vertically Aligned Niobium Nanowire Arrays for Fast-Charging Micro-Supercapacitors.
basic_science · Level V
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- Record sourced from PubMed, PMID 28493361.
- Also identified by DOI 10.1002/adma.201700671.
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Abstract
Planar micro-supercapacitors are attractive for system on chip technologies and surface mount devices due to their large areal capacitance and energy/power density compared to the traditional oxide-based capacitors. In the present work, a novel material, niobium nanowires, in form of vertically aligned electrodes for application in high performance planar micro-supercapacitors is introduced. Specific capacitance of up to 1 kF m<sup>-2</sup> (100 mF cm<sup>-2</sup> ) with peak energy and power density of 2 kJ m<sup>-2</sup> (6.2 MJ m<sup>-3</sup> or 1.7 mWh cm<sup>-3</sup> ) and 150 kW m<sup>-2</sup> (480 MW m<sup>-3</sup> or 480 W cm<sup>-3</sup> ), respectively, is achieved. This remarkable power density, originating from the extremely low equivalent series resistance value of 0.27 Ω (2.49 µΩ m<sup>2</sup> or 24.9 mΩ cm<sup>2</sup> ) and large specific capacitance, is among the highest for planar micro-supercapacitors electrodes made of nanomaterials.