期刊
ELECTROCHIMICA ACTA
卷 182, 期 -, 页码 289-296出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.09.100
关键词
Cobalt oxide; Carbon nanofiber; Li-air battery; Self-standing; Zeolite imidazolate frameworks
资金
- MSIP(Ministry of Science, ICT and Future Planning), Korea [IITP-2015-R0346-15-1008]
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. (C) 2015 Elsevier Ltd. All rights reserved.
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