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Graphene coated carbon felt as a high-performance electrode for all vanadium redox flow batteries.
- Source :
-
Surface & Coatings Technology . Jan2019, Vol. 358, p153-158. 6p. - Publication Year :
- 2019
-
Abstract
- Abstract Graphene deposited on the surface of a carbon felt (CF) using a solution coating method has been developed as a high-performance positive electrode for an all vanadium redox flow battery (VRB). A key to obtain excellent electrochemical activity towards the VO 2 +/VO2+ redox couple is to wrap the CF using the graphene with high specific surface area and superb conductivity. It is found that the dipping times of CF into the graphene/Nafion solution significantly affect its electrochemical activity. The cyclic voltammetry (CV) results indicate that with 5 dipping times, the graphene coated CF (G/CF) exhibits the highest peak current and lowest peak potential difference towards the VO 2 +/VO2+ redox couple. More importantly, the VRB assembled with our novel G/CF cathodic electrode shows a decreased polarization during charge/discharge process compared with the control VRB with the pristine CF. Consequently, both the voltage efficiency and energy efficiency of the VRB with G/CF electrode have increased compared to the one with pristine CF. Our work provides a simple solution coating process to fabricate graphene modified CF electrode for VRB with high performance and this simple method is believed to be promising in other electrocatalysts applications. Highlights • A graphene coated carbon felt electrode (G/CF) for has been fabricated. • The graphene is homogenous dispersed on the surface of fiber of carbon felt. • The G/CF electrode displays high activity towards the VO2+/VO 2 + redox couple. • The G/CF electrode shows much better cell performance compared to pristine carbon felt electrode. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTRODES
*VANADIUM redox battery
*CARBON
*GRAPHENE
*ELECTROCHEMISTRY
Subjects
Details
- Language :
- English
- ISSN :
- 02578972
- Volume :
- 358
- Database :
- Academic Search Index
- Journal :
- Surface & Coatings Technology
- Publication Type :
- Academic Journal
- Accession number :
- 133827191
- Full Text :
- https://doi.org/10.1016/j.surfcoat.2018.11.024