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https://ir.lib.ncu.edu.tw/handle/987654321/100507
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| 題名: | Controlled synthesis of porous spinel cobaltite core-shell microspheres as high-performance catalysts for rechargeable Li-O2 batteries |
| 作者: | 鄭芳怡;Peng, Shengjie;Hu, Yuxiang;Li, Linlin;Han, Xiaopeng;Cheng, Fangyi;Srinivasan, Madhavi;Yan, Qingyu;Ramakrishna, Seeram;Chen, Jun |
| 貢獻者: | 地球科學學院大氣科學學系 |
| 關鍵詞: | Cathode electrocatalyst;Core–shell structures;Li–O2 battery;Microspheres;Spinel |
| 日期: | 2015-04-01 |
| 上傳時間: | 2026-04-21 14:04:46 (UTC+8) |
| 出版者: | Elsevier BV;Elsevier Ltd |
| 摘要: | 摘要： Rechargeable lithium–oxygen (Li–O2) batteries are attracting much interest due to their highest energy density among chemical batteries. Recent studies have focused on designing highly efficient catalysts to improve the electrochemical performance of Li–O2 batteries for long-term cycling. In this work, we report controlled synthesis of high efficient spinel catalysts in Li–O2 batteries. The catalysts present core–shell spheres, which are constructed by porous nanoplates. The remarkable feature of the hierarchical porous structure cannot only provide many electrocatalytic sites but also facilitate the flow of oxygen and infiltration of the electrolyte, and eventually improving the capacity and cyclability. As a representative catalyst, the synergistic effects of the inherited superior catalytic activity and the unique porous structure of NiCo2O4 lead to low overpotentials, high rate capacity as well as excellent long-term cyclability in Li–O2 cells. This study affords a new strategy to achieve optimal performance in spinel catalysts, which may be extended to the preparation of other materials for a broad range of energy and environmental applications. Hierarchical spinel core–shell microspheres were synthesized by a facile solvothermal method, including NiCo2O4, MnCo2O4 and ZnCo2O4. By taking advantage of the superior electrocatalytic activity and porous unique features, the as-prepared catalyst electrode exhibited low overpotentials, high rate capacity as well as excellent long-term cyclability. [Display omitted] •A general strategy is developed to synthesize cobaltite microspheres.•The core–shell microspheres are constructed by porous plates.•NiCo2O4 demonstrates low overpotentials, high rate capacity as well as excellent long-term cyclability in Li–O2 cells.•MnCo2O4 and ZnCo2O4 also show high electrochemical performances in Li–O2 cells.•This study affords a new strategy to prepare other materials for a broad range of energy and environmental applications.
出版者： Elsevier Ltd
出版日期： 2015-04
出處： Nano energy, 2015-04, Vol.13, p.718-726
版權： 2015 Elsevier Ltd
識別號： ISSN: 2211-2855
識別號： DOI: 10.1016/j.nanoen.2015.03.021 |
| 顯示於類別: | [大氣科學學系] 期刊論文
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