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N‑Doped Hierarchical Continuous Hollow Thin Porous Carbon Nanostructure for High-Performance Flexible Gel-Type Symmetric Supercapacitors
journal contribution
posted on 2019-09-11, 17:48 authored by Po-Yuan Cheng, Heng-Yi Cheng, Chun-Lung Huang, Yu-An Chen, Cheng-Ting Hsieh, Shih-Yuan LuA N-doped
hierarchical porous carbon nanostructure (NHPCN) was
created on a carbon cloth (CC), through a templating process using
self-assembled mesoporous silica spheres as the template, to fabricate
high-performance flexible gel-type symmetric supercapacitors (NHPCN@CC//NHPCN@CC).
The NHPCN@CC//NHPCN@CC cell exhibited outstanding capacitive performances,
giving a decent energy density of 10.3 W h kg–1 at
a high power density of 10 kW kg–1 and reaching
a high energy density of 24.3 W h kg–1 at a power
density of 0.5 kW kg–1, outperforming most carbon-based
gel-type, symmetric supercapacitors. This success may be attributed
to the continuous hollow, thin features of the NHPCN, with the hollow
structure enabling local, fast adsorption/desorption of electrolyte
ions for generation of electric double-layer capacitances and the
thin carbon shells offering large amounts of exposed surface areas
for accommodation of electric double-layer capacitances and pseudo-capacitances.
The NHPCN@CC//NHPCN@CC cell exhibited a high specific capacitance
retention rate of 85% after 8000 cycle operations at 10 A g–1, showing its good cycling stability. The mechanical robustness of
the NHPCN@CC//NHPCN@CC cell was also excellent, with the energy and
power densities well-maintained even under a large bending angle of
135°.