Interfacial redox reaction-directed synthesis of silver@cerium oxide core-shell nanocomposites as catalysts for rechargeable lithium-air batteries

Liu, Ying1; Wang, Man1; Cao, Lu-Jie2; Yang, Ming-Yang2; Cheng, Samson Ho-Sum1; Cao, Chen-Wei1; Leung, Kwan-Lan1; Chung, Chi-Yuen1; Lu, Zhou-Guang2

2015-07-15

10.1016/j.jpowsour.2015.03.147

JOURNAL OF POWER SOURCES   影响因子和分区

0378-7753

1873-2755

A facile oxidation reduction reaction method has been implemented to prepare pomegranate-like Ag@CeO2 multicore shell structured nanocomposites. Under Ar atmosphere, redox reaction automatically occurs between AgNO3 and Ce(NO3)(3) in an alkaline solution, where Ag+ is reduced to Ag nanopartilces and Ce3+ is simultaneously oxidized to form CeO2, followed by the self-assembly to form the pomegranate-like multicore shell structured Ag@CeO2 nanocomposites driven by thermodynamic equilibrium. No other organic amines or surfactants are utilized in the whole reaction system and only NaOH instead of organic reducing agent is used to prevent the introduction of a secondary reducing byproduct. The as-obtained pomegranate-like Ag@CeO2 multicore shell structured nanocomposites have been characterized as electro-catalysts for the air cathode of lithium air batteries operated in a simulated air environment. Superior electrochemical performance with high discharge capacity of 3415 mAh g(-1) at 100 mA g(-1), stable cycling and small charge/discharge polarization voltage is achieved, which is much better than that of the CeO2 or simple mixture of CeO2 and Ag. The enhanced properties can be primarily attributed to the synergy effect between the Ag core and the CeO2 shell resulting from the unique pomegranate-like multicore-shell nanostructures possessing plenty of active sites to promote the facile formation and decomposition of Li2O2. (C) 2015 Elsevier B.V. All rights reserved.

Lithium-air batteries Silver Cerium oxide Catalyst Interfacial redox reaction

SCI ; EI

英语

其他

Starting-Up Funds of South University of Science and Technology of China (SUSTC) through the talent plan of the Shenzhen Government.[201307262]

Chemistry ; Electrochemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Electrochemistry ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000355027400016

ELSEVIER SCIENCE BV

20151400708615

Amines ; Catalysts ; Lithium-air batteries ; Nanocatalysts ; Nanocomposites ; Oxides ; Redox reactions ; Shells (structures) ; Silver ; Sodium hydroxide

Structural Members and Shapes:408.2 ; Precious Metals:547.1 ; Nanotechnology:761 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Solid State Physics:933

MATERIALS SCIENCE

Web of Science

1.City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China
2.South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen 518000, Peoples R China

Liu, Ying,Wang, Man,Cao, Lu-Jie,et al. Interfacial redox reaction-directed synthesis of silver@cerium oxide core-shell nanocomposites as catalysts for rechargeable lithium-air batteries[J]. JOURNAL OF POWER SOURCES,2015,286:136-144.

Liu, Ying.,Wang, Man.,Cao, Lu-Jie.,Yang, Ming-Yang.,Cheng, Samson Ho-Sum.,...&Lu, Zhou-Guang.(2015).Interfacial redox reaction-directed synthesis of silver@cerium oxide core-shell nanocomposites as catalysts for rechargeable lithium-air batteries.JOURNAL OF POWER SOURCES,286,136-144.

Liu, Ying,et al."Interfacial redox reaction-directed synthesis of silver@cerium oxide core-shell nanocomposites as catalysts for rechargeable lithium-air batteries".JOURNAL OF POWER SOURCES 286(2015):136-144.