We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Tailored Porous ZnCo<sub>2</sub>O<sub>4</sub> Nanofibrous Electrocatalysts for Lithium-Oxygen Batteries.
- Authors
Kim, Jae-Chan; Lee, Gwang-Hee; Lee, Seun; Oh, Seung-Ik; Kang, Yongku; Kim, Dong-Wan
- Abstract
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.
- Subjects
ZINC oxide; NANOFIBERS; ELECTROCATALYSTS; ENERGY density; NANOSTRUCTURED materials
- Publication
Advanced Materials Interfaces, 2018, Vol 5, Issue 4, p1
- ISSN
2196-7350
- Publication type
Article
- DOI
10.1002/admi.201701234