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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
发表期刊JOURNAL OF MATERIALS CHEMISTRY A
卷号3期号:34页码:17598-17605
摘要The 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.
文章类型Article
学科领域Chemistry; Energy & Fuels; Materials Science
DOI10.1039/c5ta03885e
收录类别SCI ; EI
WOS类目Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS记录号WOS:000360049900013
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被引频次:28[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228659
专题多学科研究中心
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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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