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Vertically Aligned Niobium Nanowire Arrays for Fast‐Charging Micro‐Supercapacitors
Author(s) -
Mirvakili Seyed M.,
Hunter Ian W.
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201700671
Subject(s) - supercapacitor , materials science , capacitance , capacitor , power density , niobium , planar , electrode , nanowire , optoelectronics , nanotechnology , energy storage , equivalent series resistance , nanomaterials , niobium oxide , power (physics) , electrical engineering , voltage , metallurgy , chemistry , physics , computer graphics (images) , quantum mechanics , computer science , engineering
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 −2 (100 mF cm −2 ) with peak energy and power density of 2 kJ m −2 (6.2 MJ m −3 or 1.7 mWh cm −3 ) and 150 kW m −2 (480 MW m −3 or 480 W cm −3 ), respectively, is achieved. This remarkable power density, originating from the extremely low equivalent series resistance value of 0.27 Ω (2.49 µΩ m 2 or 24.9 mΩ cm 2 ) and large specific capacitance, is among the highest for planar micro‐supercapacitors electrodes made of nanomaterials.