| Autor: |
Kim, Jae-Chan, Lee, Gwang-Hee, Lee, Seun, Oh, Seung-Ik, Kang, Yongku, Kim, Dong-Wan |
| Předmět: |
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| Zdroj: |
Advanced Materials Interfaces; 2/22/2018, Vol. 5 Issue 4, p1-N.PAG, 8p |
| Abstrakt: |
Lithium-oxygen batteries are considered a next-generation technology owing to their extremely high theoretical energy density despite many challenges such as low round-trip efficiency and poor cyclability. The air-cathode structure and pore properties play a key role in solving these problems. In this study, we fabricate ZnCo2O4 nanofibers and design a porous nanostructure using a facile electrospinning process and selective etching of ZnO as the cathode material in lithium-oxygen batteries. First, non-porous ZnCo2O4 nanofiber electrodes accomplish high catalytic activity and good cycling stability during 116 cycles with a limited capacity of 1000 mA h g-1 at a current density of 500 mA g-1. For enhanced catalytic activity and cyclability, ZnO included ZnCo2O4 nanofibers are prepared using a Zn-excess electrospun solution and porous ZnCo2O4 nanofibers are fabricated via selective etching of ZnO. Porous ZnCo2O4 nanofiber electrodes exhibit excellent electrocatalytic activity and cyclability for 226 cycles with a limited capacity of 1000 mA h g-1 at a current density of 500 mA g-1. The exceptional catalytic properties explain the synergistic effect of the one-dimensional nanostructure and porous structure with an appropriate pore diameter, providing a large active site and an efficient electron pathway during the Li2O2 formation/ decomposition process. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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