15August2020

Nano-Micro Letters

An Ultra-microporous Carbon Material Boosting Integrated Capacitance for Cellulose-based Supercapacitors

Chenfeng Ding1, 4, Tianyi Liu1, Xiaodong Yan2, Lingbo Huang1, Seungkon Ryu3, Jinle Lan1, Yunhua Yu1, *, Wei-Hong Zhong4, *, Xiaoping Yang1

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Nano-Micro Lett. (2020) 12: 63

First Online: 24 February 2020 (Article)

DOI:10.1007/s40820-020-0393-7

*Corresponding author. E-mail: katie_zhong@wsu.edu (Wei-Hong Zhong); yuyh@mail.buct.edu.cn (Yunhua Yu)

 

Abstract

 


Toc

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 (u-MPC) 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 (1,554 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 supercapacitor presents super high areal energy density (~0.77 mWh cm-2), volumetric energy density (~17.8 W L-1) and excellent cyclic stability.


 

Keywords

Integrated capacitance; Bacterial cellulose; Microporous carbon; Heteroatom doping; Supercapacitors

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