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Hierarchical Vertically Aligned Titanium Carbide (MXene) Array for Flexible All-Solid-State Supercapacitor with High Volumetric Capacitance
journal contribution
posted on 2019-09-11, 19:03 authored by Qian Pan, Chunyang Duan, Hongying Liu, Mengqi Li, Zenghua Zhao, Dong Zhao, Yuda Duan, Yunfa Chen, Yu WangThe
traditional method for fabricating film electrodes may cause the restacking
of the nanomaterials, which leads to the severe reduction of specific
surface area and hinders the contact of ions with active sites. Herein,
a vertically aligned hierarchical array structure is achieved with
the accordion-structured MXene particles as the building block, and
high-performance flexible all-solid-state supercapacitors (ASSSs)
are fabricated with this original structure. These electrodes not
only retain the accordion structure of MXene but also possess a micron-scale
array structure, which could both avoid the restacking of the two-dimensional
nanomaterials and facilitate the ion migration and electron transport
in the solid-state devices. The as-prepared ASSSs exhibited a high
volumetric capacitance of 485 F cm–3 at 1 A cm–3 with an ultrahigh energy density of 9.6 mWh cm–3, and a power density of 2800 mW cm–3 under the optimal conditions, and demonstrate high flexibility and
weakened correlation between capacitance properties with material
thickness. This hierarchical array structure achieves a remarkable
increase in specific capacitance by ∼200% compared with that
of the film counterpart, which demonstrates a valid way to design
electrodes for electrochemical energy storage and generation devices.
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array structureultrahigh energy densityrestackingASSSelectrodeelectrochemical energy storageFlexible All-Solid-State SupercapacitorHierarchical Vertically Aligned Titanium CarbidecmHigh Volumetric Capacitanceaccordion-structured MXene particlescapacitancefilmdevicemicron-scale array structurenanomaterial
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