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Issue 28, 2020
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Controlled preparation of interconnected 3D hierarchical porous carbons from bacterial cellulose-based composite monoliths for supercapacitors

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Abstract

The controlled design and synthesis of porous carbons with anticipated microstructures and morphologies, and a high specific surface area (SSA) have been focused on for supercapacitor development. Here, hierarchical porous carbons (HPCs) with an interconnected three-dimensional morphology derived from a natural-based bacterial cellulose (BC) composite have been successfully prepared by thermally induced phase separation of poly(ethylene-co-vinyl alcohol) (EVOH) and subsequent carbonization/activation. The SSA and porous architectures can be controlled by fine-tuning the preparation conditions such as the precursor morphology and structure, activator dosage and activation temperature, and the relationships between the super-capacitive properties and the SSA and pore size distribution have been further investigated. The obtained porous carbon material possesses a hierarchical porous structure with moderate micropores, favorable mesopores, interconnected macropores, a high SSA of 2161 m2 g−1 and a maximum oxygen-dopant content of 9.99%, enabling an increase in the active materials utilization efficiency and wettability. Due to the synergistic effects of these features, the obtained porous carbon electrode used in a supercapacitor shows a high specific capacitance of 420 F g−1 at 0.5 A g−1, excellent rate performance with 75% capacitance retention at 20 A g−1, and good cycling stability with ∼96.1% retention even after 10 000 continuous charge–discharge cycles at 5 A g−1. Additionally, the assembled supercapacitor based on porous carbon displays a moderate energy density of 20 W h kg−1. The good electrochemical performance and facile effective synthesis of bio-derived carbon materials with tunable porous structures indicate promising applications in supercapacitors.

Graphical abstract: Controlled preparation of interconnected 3D hierarchical porous carbons from bacterial cellulose-based composite monoliths for supercapacitors

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Supplementary files

Article information


Submitted
08 May 2020
Accepted
18 Jun 2020
First published
23 Jun 2020

Nanoscale, 2020,12, 15261-15274
Article type
Paper

Controlled preparation of interconnected 3D hierarchical porous carbons from bacterial cellulose-based composite monoliths for supercapacitors

Q. Bai, Y. Shen, T. Asoh, C. Li, Y. Dan and H. Uyama, Nanoscale, 2020, 12, 15261
DOI: 10.1039/D0NR03591B

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