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Vol. 12 (2020)

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

https://doi.org/10.1007/s40820-020-0393-7
Chenfeng Ding
State Key Laboratory of Organic‑Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Tianyi Liu
State Key Laboratory of Organic‑Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Xiaodong Yan
Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu, People’s Republic of China
Lingbo Huang
State Key Laboratory of Organic‑Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Seungkon Ryu
Institute of Carbon Tech., Jeonju University, Jeonju 55069, South Korea
Jinle Lan
State Key Laboratory of Organic‑Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Yunhua Yu
State Key Laboratory of Organic‑Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Wei‑Hong Zhong
School of Mechanical and Material Engineering, Washington State University, Pullman 99163, USA
Xiaoping Yang
State Key Laboratory of Organic‑Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China

Corresponding Author: Wei‑Hong Zhong

katie_zhong@wsu.edu

Nano-Micro Letters, Vol. 12 (2020), Article Number: 63

Abstract

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.


Highlights:


1 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.
2 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.

Keywords

Integrated capacitance Bacterial cellulose Microporous carbon Heteroatom doping Supercapacitors
Ding, Chenfeng, Tianyi Liu, Xiaodong Yan, Lingbo Huang, Seungkon Ryu, Jinle Lan, Yunhua Yu, Wei‑Hong Zhong, and Xiaoping Yang. 2020. “An Ultra-Microporous Carbon Material Boosting Integrated Capacitance for Cellulose-Based Supercapacitors”. Nano-Micro Letters 12 (February):63. https://doi.org/10.1007/s40820-020-0393-7.
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