Study on leaf-shaped cobalt-based metal-organic frameworks synthesized by solvothermal method as high discharge current density air cathode catalyst for lithium-oxygen batteries
A type of leaf-shaped cobalt-based metal-organic framework material is synthesized by solvothermal method with 1.3:1 cobalt and terephthalic acid ratio and uses as the air electrode catalyst for lithium-oxygen batteries working at high discharge current density. Physical characterization displays th...
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Veröffentlicht in: | Ionics 2020-05, Vol.26 (5), p.2673-2680 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A type of leaf-shaped cobalt-based metal-organic framework material is synthesized by solvothermal method with 1.3:1 cobalt and terephthalic acid ratio and uses as the air electrode catalyst for lithium-oxygen batteries working at high discharge current density. Physical characterization displays that the interaction between cobalt and terephthalic acid can produce a crystal material and the different proportions have a certain influence on their structure and crystallinity. In addition, micromorphology with cobalt and terephthalic acid 1.3:1 shows a leaf-like structure, and synaptic structure on the leaf surface may be beneficial to improve the catalytic activity. Electrochemical tests present that air electrode using this leaf-like structure catalyst materials has good reversibility and the specific discharge capacities can achieve to 3573.90 mAh g
−1
at 0.5 mA cm
−2
current densities. However, compared with existing catalysts, these leaf-shaped catalyst materials have no obvious advantage in improving the cycle life. |
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ISSN: | 0947-7047 1862-0760 |
DOI: | 10.1007/s11581-020-03501-z |