Freestanding hierarchical porous carbon film derived from hybrid nanocellulose for high-power supercapacitors

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1007/s12274-017-1573-8
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Name affiliation
  1. National Research Council of Canada. Aquatic and Crop Resource Development
FormatText, Article
Journal titleNano Research
ISSN1998-0124
1998-0000
Volume10
Issue5
Pages1847–1860
Subjectsupercapacitors; hierarchical structure; atomic layer deposition (ALD); integrated structure
Abstract
Nanocellulose is a sustainable and eco-friendly nanomaterial derived from renewable biomass. In this study, we utilized the structural advantages of two types of nanocellulose and fabricated freestanding carbonized hybrid nanocellulose films as electrode materials for supercapacitors. The long cellulose nanofibrils (CNFs) formed a macroporous framework, and the short cellulose nanocrystals were assembled around the CNF framework and generated micro/mesopores. This two-level hierarchical porous structure was successfully preserved during carbonization because of a thin atomic layer deposited (ALD) Al2O3 conformal coating, which effectively prevented the aggregation of nanocellulose. These carbonized, partially graphitized nanocellulose fibers were interconnected, forming an integrated and highly conductive network with a large specific surface area of 1,244 m2·g–1. The two-level hierarchical porous structure facilitated fast ion transport in the film. When tested as an electrode material with a high mass loading of 4 mg·cm–2 for supercapacitors, the hierarchical porous carbon film derived from hybrid nanocellulose exhibited a specific capacitance of 170 F·g–1 and extraordinary performance at high current densities. Even at a very high current of 50 A·g–1, it retained 65% of its original specific capacitance, which makes it a promising electrode material for high-power applications.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NPARC number23003076
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