Tailored Porous ZnCo2O4 Nanofibrous Electrocatalysts for Lithium-Oxygen Batteries
- Authors
- Kim, Jae-Chan; Lee, Gwang-Hee; Lee, Seun; Oh, Seung-Ik; Kang, Yongku; Kim, Dong-Wan
- Issue Date
- 22-2월-2018
- Publisher
- WILEY
- Keywords
- electrospinning; lithium-oxygen batteries; nanofibers; porous structure; ZnCo2O4
- Citation
- ADVANCED MATERIALS INTERFACES, v.5, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED MATERIALS INTERFACES
- Volume
- 5
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/77320
- DOI
- 10.1002/admi.201701234
- ISSN
- 2196-7350
- 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.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.