Vertically self-standing C@NiCo2O4 nanoneedle arrays as effective binder-free cathodes for rechargeable Na-O-2 batteries

doi:10.1016/j.jallcom.2018.09.121

	Vertically self-standing C@NiCo2O4 nanoneedle arrays as effective binder-free cathodes for rechargeable Na-O-2 batteries
	Liu, Yunzhao; Chi, Xiaowei; Han, Qi; Du, Yuexiu; Yang, Jianhua; Liu, Yu
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2019-01-25
卷号	772 页码:693
关键词	NiCo2O4 Nanoneedle arrays Na-O-2 batteries Cathode
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2018.09.121
文献子类	Article
英文摘要	Sodium-oxygen (Na-O-2) batteries are being extensively studied because of their higher energy efficiency and lower cost compared to those of lithium-oxygen (Li-O-2) batteries. However, highly efficient and durable cathode catalysts are very limited, thus considerably hindering the application of Na-O-2 batteries. Herein, a vertically self-standing C@NiCo2O4 nanoneedle arrays (C@NiCo2O4-NAs) have been delicately designed and fabricated by a facile hydrothermal method. The NiCo2O4 nanoneedles are in-situ grown on the carbon paper, forming an unique urchin-like structure, which is directly used to Na-O-2 batteries as a self-standing and binder-free cathode for the first time. Under a current density of 50 mA g(-1), the Na-O-2 battery containing C@NiCo2O4-NAs cathode shows a high initial discharge capacity of 6500 mAh g(-1) (based on NiCo2O4 material mass) and low over-potential of 0.6 V due to the numerous catalytic sites and high electron mobility of C@NiCo2O4-NAs. SEM, XPS and FTIR tests have confirmed the formation of thin film-like Na2O2 discharge product on the surface and gaps of NiCo2O4 nanoneedles, and the special film-like structure can facilitate the decomposition of Na2O2 in the subsequent charging process and reduce the over-potential notably. Meanwhile, the robust urchin-like structure of C@NiCo2O4-NAs renders the Na-O-2 battery a high cyclic stability up to 120 cycles when the specific capacity is limited to be 800 mAh g(-1). (C) 2018 Elsevier B.V. All rights reserved.
WOS关键词	SODIUM-OXYGEN BATTERIES ; ENHANCED ELECTROCHEMICAL PERFORMANCE ; LITHIUM-ION BATTERIES ; METAL-AIR BATTERIES ; LI-O-2 BATTERIES ; BIFUNCTIONAL CATALYST ; GRAPHENE NANOSHEETS ; NICO2O4 NANOSHEETS ; CARBON NANOTUBES ; NI FOAM
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/27563]
专题	中国科学院上海硅酸盐研究所
推荐引用方式 GB/T 7714	Liu, Yunzhao,Chi, Xiaowei,Han, Qi,et al. Vertically self-standing C@NiCo2O4 nanoneedle arrays as effective binder-free cathodes for rechargeable Na-O-2 batteries[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,772:693.
APA	Liu, Yunzhao,Chi, Xiaowei,Han, Qi,Du, Yuexiu,Yang, Jianhua,&Liu, Yu.(2019).Vertically self-standing C@NiCo2O4 nanoneedle arrays as effective binder-free cathodes for rechargeable Na-O-2 batteries.JOURNAL OF ALLOYS AND COMPOUNDS,772,693.
MLA	Liu, Yunzhao,et al."Vertically self-standing C@NiCo2O4 nanoneedle arrays as effective binder-free cathodes for rechargeable Na-O-2 batteries".JOURNAL OF ALLOYS AND COMPOUNDS 772(2019):693.