Toward Lower Overpotential through Improved Electron Transport Property: Hierarchically Porous CoN Nanorods Prepared by Nitridation for Lithium–Oxygen Batteries
| Autor: | Michelle M. Harris, Hua-Sheng Xu, Yong-Xian Zhou, Shu-Mao Xu, Kai-Xue Wang, Qian-Cheng Zhu, Tong-Heng Chen, Xiao Wei, Chao Ma, Jie-Sheng Chen, Yu-Cai Cao |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Inorganic chemistry Oxide chemistry.chemical_element Bioengineering 02 engineering and technology Thermal treatment Overpotential 010402 general chemistry 01 natural sciences law.invention Catalysis chemistry.chemical_compound law General Materials Science Mechanical Engineering General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electron transport chain Cathode 0104 chemical sciences chemistry Nanorod Lithium 0210 nano-technology |
| Zdroj: | Nano Letters. 16:5902-5908 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.6b02805 |
| Popis: | To lower the overpotential of a lithium-oxygen battery, electron transport at the solid-to-solid interface between the discharge product Li2O2 and the cathode catalyst is of great significance. Here we propose a strategy to enhance electron transport property of the cathode catalyst by the replace of oxygen atoms in the generally used metal oxide-based catalysts with nitrogen atoms to improve electron density at Fermi energy after nitridation. Hierarchically porous CoN nanorods were obtained by thermal treatment of Co3O4 nanorods under ammonia atmosphere at 350 °C. Compared with that of the pristine Co3O4 precursor before nitridation, the overpotential of the obtained CoN cathode was significantly decreased. Moreover, specific capacity and cycling stability of the CoN nanorods were enhanced. It is assumed that the discharged products with different morphologies for Co3O4 and CoN cathodes might be closely associated with the variation in the electronic density induced by occupancy of nitrogen atoms into interstitial sites of metal lattice after nitridation. The nitridation strategy for improved electron density proposed in this work is proved to be a simple but efficient way to improve the electrochemical performance of metal oxide based cathodes for lithium-oxygen batteries. |
| Databáze: | OpenAIRE |
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