Nitrogen-Doping Through Two-Step Pyrolysis of Polyacrylonitrile on Graphite Felts for Vanadium Redox Flow Batteries
- Authors
- Yoon, Sang Jun; Kim, Sangwon; Kim, Dong Kyu; Yu, Duk Man; Hempelmann, Rolf; Hong, Young Taik; So, Soonyong
- Issue Date
- 16-Apr-2020
- Publisher
- AMER CHEMICAL SOC
- Citation
- ENERGY & FUELS, v.34, no.4, pp 5052 - 5059
- Pages
- 8
- Journal Title
- ENERGY & FUELS
- Volume
- 34
- Number
- 4
- Start Page
- 5052
- End Page
- 5059
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/42666
- DOI
- 10.1021/acs.energyfuels.0c00689
- ISSN
- 0887-0624
1520-5029
- Abstract
- We report a facile method for the nitrogen-doping process using the same precursor material for graphite felt electrodes, polyacrylonitrile (PAN). To utilize the nitrogen content in PAN, two steps of thermal treatment of PAN-coated graphite felts are performed; a PAN solution is coated on a graphite felt, and the sample is oxidized at 280 degrees C under the ambient atmosphere and carbonized at 900 degrees C under N-2, consecutively. Through the two-step pyrolysis, nitrogen is successfully doped on the graphite felts, and the concentration of PAN solution is controlled to enhance the performance of vanadium redox flow batteries (VRFBs). With 4 wt % of PAN coating solution, the electrode electrocatalytic activity is enhanced compared to that of a conventional electrode, and the voltage efficiency increases, resulting in higher energy efficiency under the various current densities. Especially at high current densities above 100 mA/cm(2), the optimized nitrogen-doped electrode shows about 5% higher voltage and energy efficiencies and a higher long-term stability in terms of efficiencies and capacity retention. This nitrogen-doping process with the same precursor for the electrode offers potential for employing nitrogen-doping on the conventional electrode materials in an inexpensive way.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > School of Mechanical Engineering > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/42666)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.