Bifunctional Composite Catalysts Using Co3O4 Nanofibers Immobilized on Nonoxidized Graphene Nanoflakes for High-Capacity and Long-Cycle Li-O-2 Batteries
- Authors
- Ryu, WH; Yoon, TH; Song, SH; Jeon, S; Park, YJ; Kim, ID
- Issue Date
- Sep-2013
- Publisher
- AMER CHEMICAL SOC
- Citation
- NANO LETTERS, v.13, no.9, pp 4190 - 4197
- Pages
- 8
- Journal Title
- NANO LETTERS
- Volume
- 13
- Number
- 9
- Start Page
- 4190
- End Page
- 4197
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147418
- DOI
- 10.1021/nl401868q
- ISSN
- 1530-6984
1530-6992
- Abstract
- Designing a highly efficient catalyst is essential to improve the electrochemical performance of Li-O-2 batteries for long-term cycling. Furthermore, these batteries often show significant capacity fading due to the irreversible reaction characteristics of the Li2O2 product. To overcome these limitations, we propose a bifunctional composite catalyst composed of electrospun one-dimensional (ID) Co3O4 nanofibers (NFs) immobilized on both sides of the 2D nonoxidized graphene nanoflakes (GNFs) for an oxygen electrode in Li-O-2 batteries. Highly conductive GNFs with noncovalent functionalization can facilitate a homogeneous dispersion in solution, thereby enabling simple and uniform attachment of ID Co3O4 NFs on GNFs without restacicing. High first discharge capacity of 10 500 mAh/g and superior cyclability for 80 cycles with a limited capacity of 1000 mAh/g were achieved by (i) improved catalytic activity of ID Co3O4 NFs with large surface area, (ii) facile electron transport via interconnected GNFs functionalized by Co3O4 NFs, and (iii) fast O-2 diffusion through the ultrathin GNF layer and porous Co3O4 NF networks.
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