3D Graphene-Ni Foam as an Advanced Electrode for High-Performance Nonaqueous Redox Flow Batteries
- Authors
- Lee, Kyubin; Lee, Jungkuk; Kwon, Kyoung Woo; Park, Min-Sik; Hwang, Jin-Ha; Kim, Ki Jae
- Issue Date
- 12-Jul-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- nonaqueous redox flow battery; electrode; Ni metal foam; graphene; energy storage system
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.9, no.27, pp.22502 - 22508
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 9
- Number
- 27
- Start Page
- 22502
- End Page
- 22508
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/5509
- DOI
- 10.1021/acsami.7b04777
- ISSN
- 1944-8244
- Abstract
- Electrodes composed of multilayered graphene grown on a metal foam (GMF) were prepared by directly growing multilayer graphene sheets on a three-dimensional (3D) Ni-foam substrate via a self-catalyzing chemical vapor deposition process. The multilayer graphene sheets are successfully grown on the Ni-foam substrate surface, maintaining the unique 3D macroporous structure of the Ni foam. The potential use of GMF electrodes in nonaqueous redox flow batteries (RFBs) is carefully examined using [Co(bpy)(3)](+/2+) and [Fe(bpy)(3)](2+/3+) redox couples. The GMF electrodes display a much improved electrochemical activity and enhanced kinetics toward the [Co(bpy)(3)](+/2+) (anolyte) and [Fe(bpy)(3)](2+/3+) (catholyte) redox couples, compared with the bare Ni metal foam electrodes, suggesting that the 2D graphene sheets having lots of interdomain defects provide sufficient reaction sites and secure electric-conduction pathways. Consequently, a nonaqueous RFB cell assembled with GMF electrodes exhibits high Coulombic and voltage efficiencies of 87.2 and 90.9%, respectively, at the first cycle. This performance can be maintained up to the 50th cycle without significant efficiency loss. Moreover, the importance of a rational electrode design for improving electrochemical performance is addressed.
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Collections - College of Engineering > Materials Science and Engineering Major > 1. Journal Articles
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