Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3nanosheets for low-overpotential Li-O2batteries

doi:10.1016/j.nanoen.2017.04.038

	Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3nanosheets for low-overpotential Li-O2batteries
	Zhang, Sanpei 1,2; Wang, Gan 1,2; Jin, Jun 1; Zhang, Linlin 1; Wen, Zhaoyin 1; Yang, Jianhua 1
刊名	Nano Energy
	2017
卷号	36 页码:186-196
ISSN号	22112855
DOI	10.1016/j.nanoen.2017.04.038
英文摘要	The efficient reversible formation of discharge products for Li-O2batteries is still challenging. Meanwhile, the question of the nature of the discharge products and their decomposition mechanism are still remain. Implanting oxygen vacancies on the metal oxides can create negative-charge surface to provide strong adsorption of active oxygen and at the same time, the exposed metal sites can serve as an efficient substrate for decomposed reaction of discharge products. In this work, we apply the graphene-like MoO3ultrathin nanosheets as a matrix. By controlling the reduction time, the MoO3nanosheets with different concentration of oxygen vacancy are obtained. Experimental results reveal that the MoO3nanosheets with the high-concentration oxygen vacancies can significantly decrease the overpotential and get enhanced electrochemical response, namely, a low overpotential of ~0.5 V can be delivered with ultra-stable cycles (over 60 cycles). Moreover, the Li-O2batteries demonstrate an interesting four-step discharge and charge process. X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy and electron energy-loss spectroscopy analyses are carried out for the four typical states of the cathode to reveal the reaction mechanism for the unique electrochemical behavior. © 2017 Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/25657]
专题	中国科学院上海硅酸盐研究所
作者单位	1.CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, China; 2.University of Chinese Academy of Sciences, Beijing; 100049, China
推荐引用方式 GB/T 7714	Zhang, Sanpei,Wang, Gan,Jin, Jun,et al. Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3nanosheets for low-overpotential Li-O2batteries[J]. Nano Energy,2017,36:186-196.
APA	Zhang, Sanpei,Wang, Gan,Jin, Jun,Zhang, Linlin,Wen, Zhaoyin,&Yang, Jianhua.(2017).Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3nanosheets for low-overpotential Li-O2batteries.Nano Energy,36,186-196.
MLA	Zhang, Sanpei,et al."Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3nanosheets for low-overpotential Li-O2batteries".Nano Energy 36(2017):186-196.