Co3O4 nanoparticles/cellulose nanowhiskers-derived amorphous carbon nanoneedles

Sustainable materials for supercapacitors and oxygen reduction electrocatalysis

R. Silva, G. M. Pereira, D. Voiry, Manish Chhowalla, Teddy Asefa

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Hybrid nanostructured materials comprised of amorphous carbon nanoneedles (CNN)-supported Co3O4 nanoparticles (Co3O4-CNN) were synthesized. The synthesis involved layer-by-layer nanocasting of cellulose nanowhiskers with precursors of cobalt oxide and silica, followed by pyrolysis of the core-shell-shell composite materials and etching of the outer silica shells from the carbonized materials. Notably, cotton-derived cellulose nanowhiskers were used as the carbon precursors, and also as the hard templates for needle-shaped carbons, in the synthesis. The effectiveness of the core-shell-shell nanoreactors, possessing the silica shell-entrapped cellulose nanowhiskers and Co(ii) ions, in generating organized carbon nanomaterials with metal oxide nanoparticles, or otherwise, as a function of the loading of Co(ii) ions was evaluated. Details of the synthetic method and the different materials in terms of composition and morphology it results in as a function of the relative amount of metal ions have also been discussed. The materials showed promising supercapacitive properties and electrocatalytic activity for the oxygen reduction reaction (ORR). The materials' double layer capacitance and performance for ORR electrocatalysis as a function of their Co3O4 content and particles size have also been discussed. The results indicated that the electrochemical properties of these hybrid materials are strongly related to the morphology of their carbon nanostructures. The synthetic method demonstrated here can potentially serve as a facile route to produce other metal oxide/carbon nanomaterials, with different morphologies and similar or better properties, using other carbon precursors.

Original languageEnglish
Pages (from-to)49385-49391
Number of pages7
JournalRSC Advances
Volume5
Issue number61
DOIs
Publication statusPublished - 2015

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Nanoneedles
Nanowhiskers
Electrocatalysis
Amorphous carbon
Cellulose
Carbon
Oxygen
Nanoparticles
Nanostructured materials
Silicon Dioxide
Hybrid materials
Silica
Oxides
Metals
Nanoreactors
Ions
Supercapacitor
Electrochemical properties
Needles
Cotton

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

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title = "Co3O4 nanoparticles/cellulose nanowhiskers-derived amorphous carbon nanoneedles: Sustainable materials for supercapacitors and oxygen reduction electrocatalysis",
abstract = "Hybrid nanostructured materials comprised of amorphous carbon nanoneedles (CNN)-supported Co3O4 nanoparticles (Co3O4-CNN) were synthesized. The synthesis involved layer-by-layer nanocasting of cellulose nanowhiskers with precursors of cobalt oxide and silica, followed by pyrolysis of the core-shell-shell composite materials and etching of the outer silica shells from the carbonized materials. Notably, cotton-derived cellulose nanowhiskers were used as the carbon precursors, and also as the hard templates for needle-shaped carbons, in the synthesis. The effectiveness of the core-shell-shell nanoreactors, possessing the silica shell-entrapped cellulose nanowhiskers and Co(ii) ions, in generating organized carbon nanomaterials with metal oxide nanoparticles, or otherwise, as a function of the loading of Co(ii) ions was evaluated. Details of the synthetic method and the different materials in terms of composition and morphology it results in as a function of the relative amount of metal ions have also been discussed. The materials showed promising supercapacitive properties and electrocatalytic activity for the oxygen reduction reaction (ORR). The materials' double layer capacitance and performance for ORR electrocatalysis as a function of their Co3O4 content and particles size have also been discussed. The results indicated that the electrochemical properties of these hybrid materials are strongly related to the morphology of their carbon nanostructures. The synthetic method demonstrated here can potentially serve as a facile route to produce other metal oxide/carbon nanomaterials, with different morphologies and similar or better properties, using other carbon precursors.",
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AU - Asefa, Teddy

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