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- Title
An Ultra-microporous Carbon Material Boosting Integrated Capacitance for Cellulose-Based Supercapacitors.
- Authors
Ding, Chenfeng; Liu, Tianyi; Yan, Xiaodong; Huang, Lingbo; Ryu, Seungkon; Lan, Jinle; Yu, Yunhua; Zhong, Wei-Hong; Yang, Xiaoping
- Abstract
Highlights: An ultra-microporous carbon material simultaneously with high specific surface area (1554 m2 g−1) and packing density (1.18 g cm−3) is designed and fabricated. The resulting carbon material integrates the high gravimetric and volumetric capacitance (430 F g−1 and 507 F cm−3 at 0.5 A g−1) and thereof provides the robust all-solid-state cellulose supercapacitor with high areal and volumetric density.A breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode materials. Herein, an ultra-microporous carbon with ultrahigh integrated capacitance fabricated via one-step carbonization/activation of dense bacterial cellulose (BC) precursor followed by nitrogen/sulfur dual doping is reported. The microporous carbon possesses highly concentrated micropores (~ 2 nm) and a considerable amount of sub-micropores (< 1 nm). The unique porous structure provides high specific surface area (1554 m2 g−1) and packing density (1.18 g cm−3). The synergistic effects from the particular porous structure and optimal doping effectively enhance ion storage and ion/electron transport. As a result, the remarkable specific capacitances, including ultrahigh gravimetric and volumetric capacitances (430 F g−1 and 507 F cm−3 at 0.5 A g−1), and excellent cycling and rate stability even at a high current density of 10 A g−1 (327 F g−1 and 385 F cm−3) are realized. Via compositing the porous carbon and BC skeleton, a robust all-solid-state cellulose-based supercapacitor presents super high areal energy density (~ 0.77 mWh cm−2), volumetric energy density (~ 17.8 W L−1), and excellent cyclic stability.
- Publication
Nano-Micro Letters, 2020, Vol 12, Issue 1, p1
- ISSN
2311-6706
- Publication type
Article
- DOI
10.1007/s40820-020-0393-7