IHEP OpenIR
The role of oxygen vacancies in improving the performance of CoO as a bifunctional cathode catalyst for rechargeable Li-O-2 batteries
Gao, R; Liu, L; Hu, ZB; Zhang, P; Cao, XZ; Wang, BY; Liu, XF; 张鹏(正); Cao XZ(曹兴忠); Wang BY(王宝义)
2015
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
EISSN2050-7496
Volume3Issue:34Pages:17598-17605
SubtypeArticle
AbstractThe design and facile synthesis of noble metal-free efficient cathode catalysts to accelerate the sluggish kinetics of both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is still a big challenge for lithium-air batteries. In this study, oxygen vacancy-bearing CoO (CoO-A) has been successfully synthesized through a simple calcination of Co(Ac)(2).4H(2)O in Ar, and the oxygen vacancies have been confirmed by Raman spectroscopy, HRTEM, X-ray photoelectron spectroscopy (XPS) and positron annihilation lifetime spectroscopy (PALS). In comparison with defect-free CoO-N, which is derived from the decomposition of Co(NO3)(2).6H(2)O, an oxygen-deficient CoO-A based cathode shows much higher cycling stability, higher rate capability, higher coulombic efficiency, and lower charge-discharge overpotential. The enhanced performances of the CoO-A based cathode can be largely attributed to the synergetic effect of CoO itself and oxygen vacancies on the promotion of both ORR and OER. CoO provides catalytic activity for ORR, and at the same time the oxygen vacancies not only facilitate the electron and Li+ migration but also act as active sites binding to O-2 and Li2O2, which accelerates the OER process. Furthermore, the formation and decomposition of Li2O2 during discharge-charge cycles have also been studied and the results indicate that CoO-A shows a high catalytic activity in the decomposition of Li2O2.
Subject AreaChemistry; Energy & Fuels; Materials Science
DOI10.1039/c5ta03885e
Indexed BySCI ; EI
Language英语
WOS Research AreaChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS SubjectChemistry ; Energy & Fuels ; Materials Science
WOS IDWOS:000360049900013
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/228659
Collection中国科学院高能物理研究所
Recommended Citation
GB/T 7714
Gao, R,Liu, L,Hu, ZB,et al. The role of oxygen vacancies in improving the performance of CoO as a bifunctional cathode catalyst for rechargeable Li-O-2 batteries[J]. JOURNAL OF MATERIALS CHEMISTRY A,2015,3(34):17598-17605.
APA Gao, R.,Liu, L.,Hu, ZB.,Zhang, P.,Cao, XZ.,...&王宝义.(2015).The role of oxygen vacancies in improving the performance of CoO as a bifunctional cathode catalyst for rechargeable Li-O-2 batteries.JOURNAL OF MATERIALS CHEMISTRY A,3(34),17598-17605.
MLA Gao, R,et al."The role of oxygen vacancies in improving the performance of CoO as a bifunctional cathode catalyst for rechargeable Li-O-2 batteries".JOURNAL OF MATERIALS CHEMISTRY A 3.34(2015):17598-17605.
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