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ACS Appl Mater Interfaces. 2019 Feb 13;11(6):5919-5927. doi: 10.1021/acsami.8b17414. Epub 2019 Feb 1.

Nanocellulose-Enabled, All-Nanofiber, High-Performance Supercapacitor.

Author information

1
Key Laboratory of Bio-based Material Science and Technology of Ministry of Education , Northeast Forestry University , Harbin 150040 , China.
2
Department of Materials Science and Engineering , University of Maryland , College Park , Maryland 20742 , United States.

Abstract

Nanocellulose has been used as a sustainable nanomaterial for constructing advanced electrochemical energy-storage systems with renewability, lightweight, flexibility, high performance, and satisfying safety. Here, we demonstrate a high-performance all-nanofiber asymmetric supercapacitor (ASC) assembled using a forest-based, nanocellulose-derived hierarchical porous carbon (nanocellulose carbon, HPC) anode, a mesoporous nanocellulose membrane separator (nanocellulose separator), and a NiCo2O4 cathode with nanocellulose carbon as the support matrix (nanocellulose cathode, HPC/NiCo2O4). HPC has a three-dimensional porous structure comprising interconnected nanofibers with an ultrahigh surface area of 2046 m2 g-1. When integrated with the mesoporous feature of the nanocellulose membrane separator, these properties facilitate the quick delivery of both ions and electrons even with a thick (up to several hundreds of micrometers) and highly loaded (5.8 mg cm-2) ASC design. Consequently, the all-nanofiber ASC demonstrates a high electrochemical performance (64.83 F g-1 (10.84 F cm-3) at 0.25 A g-1 and 32.78 F g-1 or 5.48 F cm-3 at 4 A g-1) that surpasses most cellulose-based ASCs ever reported. Moreover, the nanocellulose components promise renewability, low cost, and biodegradability, thereby presenting a promising direction toward high-power, environmentally friendly, and renewable energy-storage devices.

KEYWORDS:

asymmetric supercapacitors; cellulose nanofibers; forest nanomaterials; nanocellulose carbon; nanocellulose cathode

PMID:
30657318
DOI:
10.1021/acsami.8b17414

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