Self-standing, binder-free electrospun Co3O4/carbon nanofiber composites for non-aqueous Li-air batteries

•Co3O4/carbon nanofiber composites were synthesized successfully.•The composites were synthesized via electrospinning and post thermal treatment.•The composites retained their three-dimensional self-standing structure.•The composites are used directly as the cathode for Li-air batteries.•The improve...

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Vydáno v:Electrochimica acta Ročník 182; s. 289 - 296
Hlavní autoři: Song, Myeong Jun, Kim, Il To, Kim, Young Bok, Shin, Moo Whan
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 10.11.2015
Témata:
Carbon nanofiber
Cobalt oxide
Li-air battery
Self-standing
Zeolite imidazolate frameworks
Cobalt oxide
Carbon nanofiber
Li-air battery
Zeolite imidazolate frameworks
Self-standing
ISSN:0013-4686, 1873-3859
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Shrnutí:•Co3O4/carbon nanofiber composites were synthesized successfully.•The composites were synthesized via electrospinning and post thermal treatment.•The composites retained their three-dimensional self-standing structure.•The composites are used directly as the cathode for Li-air batteries.•The improved electrochemical performances are attributed to adding of ZIF-9. In this study, self-standing, binder-free ZIF-9 derived Co3O4/carbon nanofiber composites were synthesized via electrospinning and post thermal treatment for use as the cathode in a non-aqueous Li-air battery. Due to possessing a three-dimensional cross-linked web structure, Co3O4/carbon nanofiber composites are used directly as the cathode for Li-air batteries without the use of any binders or conductive metal foam, thus alleviating undesirable chemical reactions. We confirm that metallic cobalt (Co) in ZIF-9 is successfully oxidized to cobalt oxide (Co3O4) following two thermal treatment steps by analysis of XRD and XPS. The initial discharge capacity of Co3O4/carbon nanofiber composites exceeds 760 mAh g−1, which is a much higher discharge capacity compared to pristine carbon nanofiber (72 mAh g−1). Additionally, Co3O4/carbon nanofiber composite based cells exhibit improved cycling properties and a lower charge overpotential at various current densities. The improved electrochemical properties of the Co3O4/carbon nanofiber composites are attributed to the catalytic activity and stable contact with the homogeneously distributed Co3O4 in the carbon nanofiber structure. This work demonstrates that the synthesized Co3O4/carbon nanofiber composites could possibly be applied for use as next generation electrode materials for energy storage and conversion devices, particularly Li-air batteries.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2015.09.100