Lewis‐Acidic PtIr Multipods Enable High‐Performance Li–O 2 Batteries
| العنوان: | Lewis‐Acidic PtIr Multipods Enable High‐Performance Li–O 2 Batteries |
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| المؤلفون: | Yin Zhou, Wenshu Zhang, Kun Yin, Yiju Li, Hongbo Li, Qianfeng Gu, Jinhui Zhou, Lu Tao, Shaojun Guo, Hao Tan |
| المصدر: | Angewandte Chemie International Edition. 60:26592-26598 |
| بيانات النشر: | Wiley, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Materials science, Binding energy, Inorganic chemistry, chemistry.chemical_element, General Chemistry, Electron, Overpotential, Oxygen, Catalysis, Cathode, law.invention, Chemical kinetics, Electronegativity, chemistry, law, Electrode |
| الوصف: | The sluggish oxygen reaction kinetics concomitant with the high overpotentials and parasitic reactions from cathodes and solvents is the major challenge in aprotic lithium-oxygen (Li-O2 ) batteries. Herein, PtIr multipods with a low Lewis acidity of the Pt atoms are reported as an advanced cathode for improving overpotentials and stabilities. DFT calculations disclose that electrons have a strong disposition to transfer from Ir to Pt, since Pt has a higher electronegativity than Ir, resulting in a lower Lewis acidity of the Pt atoms than that on the pure Pt surface. The low Lewis acidity of Pt atoms on the PtIr surface entails a high electron density and a down-shifting of the d-band center, thereby weakening the binding energy towards intermediates (LiO2 ), which is the key in achieving low oxygen-reduction-reaction (ORR) and oxygen-evolution-reaction (OER) overpotentials. The Li-O2 cell based on PtIr electrodes exhibits a very low overall discharge/charge overpotential (0.44 V) and an excellent cycle life (180 cycles), outperforming the bulk of reported noble-metal-based cathodes. |
| تدمد: | 1521-3773 1433-7851 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::cf506ef9acb4ed3a38c405eb0926aa46 https://doi.org/10.1002/anie.202114067 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........cf506ef9acb4ed3a38c405eb0926aa46 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15213773 14337851 |
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