Atmosphere-Free Activation Methodology for Holey Graphene/Cellulose Nanofiber-Based Film Electrode with Highly Efficient Capacitance Performance

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aut.relation.issue1
aut.relation.journalCarbon Energy
aut.relation.volume5
dc.contributor.authorWu, H
dc.contributor.authorYuan, W
dc.contributor.authorYuan, X
dc.contributor.authorCheng, L
dc.date.accessioned2023-08-02T21:42:20Z
dc.date.available2023-08-02T21:42:20Z
dc.date.issued2022-06-20
dc.description.abstractAn efficient chamber-induced activation method was applied for the preparation of holey graphene/cellulose nanofiber-based film with high specific surface area (SSA) and multiple channels through the graphene nanosheets. With the cellulose nanofiber (CNF) simultaneously serving as “dispersing agent,” “spacer,” and “activating agent,” the graphene oxide (GO) nanosheets are perforated by the pyrolysis gas from CNF in the confined space inside the hybrid films, uniformly dispersed, and sandwiched between CNF networks with less agglomeration and restacking. Additionally, we have proved that H2O and H2 are primarily responsible for the activation and etching of GO/CNF film. As the CNF content increases, the mesoporosity of the activated reduced GO/CNF (A-RGO/CNF) film increases, and the graphene nanosheets show more nanopore perforations. Benefitting from the high SSA, high density, moderate mesoporosity, and abundant channels for ion diffusion through the graphene nanosheets, the A-RGO/CNF film exhibits the highest specific capacitance of 323 (236) F g−1 (F cm−3) at 1 A g−1. For the A-RGO5/CNF5 film containing half CNF and half GO, an excellent comprehensive electrochemical performance including superior rate performance (208 (160) F g−1 (F cm−3) at 60 A g−1) is exhibited. Moreover, the A-RGO5/CNF5 electrode in an all-solid-state flexible symmetric supercapacitor delivers a high specific capacitance of 250 (193) F g−1 (F cm−3) at 1 A g−1. This study provides a novel idea for the preparation of holey graphene-based film for supercapacitor electrodes. The strategy of simultaneously employing CNF as “dispersing agent,” “spacer,” and “activating agent” also offers a new vision for the assembly of homogeneous nanohybrid material and the utilization of pyrolysis gas.
dc.identifier.citationCarbon Energy, ISSN: 2637-9368 (Print); 2637-9368 (Online), Wiley, 5(1). doi: 10.1002/cey2.229
dc.identifier.doi10.1002/cey2.229
dc.identifier.issn2637-9368
dc.identifier.issn2637-9368
dc.identifier.urihttp://hdl.handle.net/10292/16510
dc.languageen
dc.publisherWiley
dc.relation.urihttps://onlinelibrary.wiley.com/doi/10.1002/cey2.229
dc.rights.accessrightsOpenAccess
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject40 Engineering
dc.subject4016 Materials Engineering
dc.subject34 Chemical Sciences
dc.subject3406 Physical Chemistry
dc.subjectNanotechnology
dc.subjectBioengineering
dc.subject7 Affordable and Clean Energy
dc.subject3406 Physical chemistry
dc.subject4004 Chemical engineering
dc.titleAtmosphere-Free Activation Methodology for Holey Graphene/Cellulose Nanofiber-Based Film Electrode with Highly Efficient Capacitance Performance
dc.typeJournal Article
pubs.elements-id460878
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