Enhancing the Catalytic Activity of Co3O4 for Li-O-2 Batteries through the Synergy of Surface/Interface/Doping Engineering

doi:10.1021/acscatal.7b03566

	Enhancing the Catalytic Activity of Co3O4 for Li-O-2 Batteries through the Synergy of Surface/Interface/Doping Engineering
	Liu, XF; Yang, ZZ; Zheng LR(郑黎荣); Lee, YL; Liu, L; Gu, L; Zheng, LR; Hu, ZB; Gao, R
刊名	ACS CATALYSIS
	2018
卷号	8 期号:3 页码:1955-1963
关键词	Li-O-2 battery bifunctional catalyst cobalt oxide surface/interface/doping engineering synergy
ISSN号	2155-5435
DOI	10.1021/acscatal.7b03566
文献子类	Article
英文摘要	Efficient bifunctional catalysts are highly desirable for Li-O-2 batteries to accerlerate the oxygen reduction and oxygen evolution reactions. Surface/interface regulation or doping has been used to enhance the activity of the catalysts. Herein, we propose a facile synchronous reduction strategy to fabricate a yolk-shell Co3O4@Co3O4/Ag hybrid which integrates the advantages of surface, interface, and doping engineering as a highly active catalyst for Li-O-2 batteries. The Co3O4@Co3O4/Ag-based cathode shows a high initial capacity (12000 mAh g(-1)@200 mA g(-1)), high rate capability (4700 mAh g(-1)@800 mA g(-1)), low overpotential, and long cycle life due to the synergetic interactions of surface, interface, and doping engineering. The underling synergetic mechanism has been uncovered by X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption near-edge structure spectra, aberration-corrected scanning transmission electron microscopy, electrochemical impedance spectra, and ex situ scanning electron microscopy. For Co3O4@Co3O4/Ag, part of Ag has formed on the surface of Co3O4 shell as single atoms or clusters and a fraction of Ag has been doped into the crystal lattice of Co3O4 at the same time, which not only strengthens the Ag-Co3O4 interface binding but also tailors the valence electronic structure of Ag and Co species as well as improves the electronic conductivity. This particular architecture provides more active sites for the ORR/OER and also enhances the catalytic activity. In addition, flowerlike Li2O2 forms on the Co3O4@Co3O4/Ag cathode, which is more feasible to decompose in comparison to toroidal-like Li2O2. This study offers some insights into designing efficient cathode catalysts through a synergetic surface/interface/doping engineering strategy.
WOS关键词	LITHIUM-OXYGEN BATTERIES ; RATE CAPABILITY ; ION BATTERIES ; FREE CATHODE ; PERFORMANCE ; EFFICIENT ; NANOPARTICLES ; AU ; ELECTROCATALYST ; ELECTRODES
WOS研究方向	Chemistry
语种	英语
WOS记录号	WOS:000426804100041
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285741]
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	Liu, XF,Yang, ZZ,Zheng LR,et al. Enhancing the Catalytic Activity of Co3O4 for Li-O-2 Batteries through the Synergy of Surface/Interface/Doping Engineering[J]. ACS CATALYSIS,2018,8(3):1955-1963.
APA	Liu, XF.,Yang, ZZ.,郑黎荣.,Lee, YL.,Liu, L.,...&Gao, R.(2018).Enhancing the Catalytic Activity of Co3O4 for Li-O-2 Batteries through the Synergy of Surface/Interface/Doping Engineering.ACS CATALYSIS,8(3),1955-1963.
MLA	Liu, XF,et al."Enhancing the Catalytic Activity of Co3O4 for Li-O-2 Batteries through the Synergy of Surface/Interface/Doping Engineering".ACS CATALYSIS 8.3(2018):1955-1963.