Hierarchical porous FeCo2O4@Ni as a carbon- and binder-free cathode for lithium−oxygen batteries
| Autor: | Wu Lei, Zhongkuan Luo, Fang Wang, Qixing Wu, Wang Hui, Houzhen Chen, Hongjiao Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering Metals and Alloys Oxygen evolution chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences Catalysis law.invention Nickel Chemical engineering chemistry Mechanics of Materials law Materials Chemistry Lithium 0210 nano-technology Mesoporous material Carbon |
| Zdroj: | Journal of Alloys and Compounds. 780:107-115 |
| ISSN: | 0925-8388 |
| Popis: | The electrochemical performance of the lithium−oxygen (Li−O2) batteries largely depends on the material and architecture of the catalytic cathode. In this paper, to avoid the parasitic reactions of carbon and binder with discharge products and reaction intermediates, we proposed an effective design of a free-standing catalytic cathode for Li−O2 batteries. The FeCo2O4@Ni electrode consists of FeCo2O4 nanosheets grown directly on nickel (Ni) foam. The resultant hierarchical macroporous/mesoporous structure provides sufficient space for the insoluble discharge product Li2O2 and catalytically active sites for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Consequently, the carbon- and binder-free self-supporting electrode has demonstrated a high discharge capacity with relatively low charge overvoltage and a better cycle performance than the corresponding carbon-based electrodes. |
| Databáze: | OpenAIRE |
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