Boosting the Electrocatalytic Activity of Co3O4 Nanosheets for a Li-O-2 Battery through Modulating Inner Oxygen Vacancy and Exterior Co3+/Co2+ Ratio

doi:10.1021/acscatal.7b02313

	Boosting the Electrocatalytic Activity of Co3O4 Nanosheets for a Li-O-2 Battery through Modulating Inner Oxygen Vacancy and Exterior Co3+/Co2+ Ratio
	Chen ZJ(陈中军); Wang, JK; Gao, R; Zhou, D; Chen, ZJ; Wu, ZH; Schumacher, G; Hu, ZB; Liu, XF; Wu ZH(吴忠华)
刊名	ACS CATALYSIS
	2017
卷号	7 期号:10 页码:6533-6541
关键词	Co3O4 nanosheets oxygen vacancy surface electronic modulation synergetic effect Li-O-2 battery
ISSN号	2155-5435
DOI	10.1021/acscatal.7b02313
文献子类	Article
英文摘要	Rechargeable Li-O-2 batteries have been considered as the most promising chemical power owing to their ultrahigh specific energy density. However, the sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) result in high overpotential (similar to 1.5 V), poor rate capability, and even a short cycle life, which critically hinder their practical applications. Herein, we propose a synergistic strategy to boost the electrocatalytic activity of Co3O4 nanosheets for Li-O-2 batteries by tuning the inner oxygen vacancies and the exterior Co3+/Co2+ ratios, which have been identified by Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption near edge structure spectroscopy. Operando Xray diffraction and ex situ scanning electron microscopy are used to probe the evolution of the discharge product. In comparison with bulk Co3O4, the cells catalyzed by Co3O4 nanosheets show a much higher initial capacity (similar to 24051.2 mAh g(-1)), better rate capability (8683.3 mAh g(-1)@400 mA g(-1)) and cycling stability (150 cycles@400 mA g(-1)), and lower overpotential. The large enhancement in the electrochemical performances can be mainly attributed to the synergistic effect of the architectured 2D nanosheets, the oxygen vacancies, and Co3+/Co2+ difference between the surface and the interior. Moreover, the addition of LiI to the electrolyte can further reduce the overpotential, making the battery more practical. This study offers some insights into designing high-performance electrocatalysts for Li-O-2 batteries through a combination of the 2D nanosheet architecture, oxygen vacancies, and surface electronic structure regulation.
WOS关键词	RAY-ABSORPTION SPECTROSCOPY ; PERFORMANCE ; CATHODE ; ELECTROLYTE ; CARBON ; EVOLUTION ; CATALYST ; REDUCTION ; NANOWIRES ; SHEETS
WOS研究方向	Chemistry
语种	英语
WOS记录号	WOS:000412795700016
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285293]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Chen ZJ,Wang, JK,Gao, R,et al. Boosting the Electrocatalytic Activity of Co3O4 Nanosheets for a Li-O-2 Battery through Modulating Inner Oxygen Vacancy and Exterior Co3+/Co2+ Ratio[J]. ACS CATALYSIS,2017,7(10):6533-6541.
APA	陈中军.,Wang, JK.,Gao, R.,Zhou, D.,Chen, ZJ.,...&吴忠华.(2017).Boosting the Electrocatalytic Activity of Co3O4 Nanosheets for a Li-O-2 Battery through Modulating Inner Oxygen Vacancy and Exterior Co3+/Co2+ Ratio.ACS CATALYSIS,7(10),6533-6541.
MLA	陈中军,et al."Boosting the Electrocatalytic Activity of Co3O4 Nanosheets for a Li-O-2 Battery through Modulating Inner Oxygen Vacancy and Exterior Co3+/Co2+ Ratio".ACS CATALYSIS 7.10(2017):6533-6541.