Edge-halogenated graphene nanoplatelets with F, Cl, or Br as electrocatalysts for all-vanadium redox flow batteries
- Authors
- Park, Minjoon; Jeon, In-Yup; Ryu, Jaechan; Jang, Haeseong; Back, Jong-Beom; Cho, Jaephil
- Issue Date
- Aug-2016
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Halogen doping; Graphene nanoplatelet; Electrocatalyst; Vanadium redox reaction; Redox flow battery
- Citation
- NANO ENERGY, v.26, pp 233 - 240
- Pages
- 8
- Journal Title
- NANO ENERGY
- Volume
- 26
- Start Page
- 233
- End Page
- 240
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69331
- DOI
- 10.1016/j.nanoen.2016.05.027
- ISSN
- 2211-2855
2211-3282
- Abstract
- The catalytic activity of V2+/V3+ and VO2+/VO2+ redox couples on the halogen-doped graphene nanoplatelets (F-, Cl-, and Br-GNPs) is studied by ball-milling graphite flakes with fluorine (F-2), chlorine (Cl-2), and bromine (Br-2) molecules, respectively. Using the edge-selectively halogenated graphene materials with different edge exfoliation degrees, the vanadium redox reactions can be significantly facilitated by having abundant edge defects with large surface area in the order: Br-GNP > Cl-GNP > F-GNP. The influence of halogen functionalization on graphene nanoplatelets towards vanadium redox couples is further confirmed by stack-type vanadium redox flow batteries that demonstrates better cell performance than graphene nanoplatelets without dopant at the edges. Notably, the Br-GNP showed unique electrochemical performance of increased initial charge/discharge capacity and improved rate capability, respectively. It was found that halogen doping on graphene-based materials can promote vanadium redox reactions by creating effective active sites, and the electrocatalytic activity is dependent on edge exfoliation degree and well-preserved basal planes. (C) 2016 Elsevier Ltd. All rights reserved.
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