scholarly journals A new strategy for integrating abundant oxygen functional groups into carbon felt electrode for vanadium redox flow batteries

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Ki Jae Kim ◽  
Seung-Wook Lee ◽  
Taeeun Yim ◽  
Jae-Geun Kim ◽  
Jang Wook Choi ◽  
...  
Keyword(s):  
Functional Groups ◽  
Carbon Felt ◽  
Redox Flow Batteries ◽  
Oxygen Functional Groups ◽  
Flow Batteries ◽  
New Strategy ◽  
Carbon Felt Electrode ◽  
Vanadium Redox

scholarly journals Tuning the performance of vanadium redox flow batteries by modifying the structural defects of the carbon felt electrode

2019 ◽  
Vol 10 ◽  
pp. 1698-1706 ◽  
Author(s):  
Ditty Dixon ◽  
Deepu Joseph Babu ◽  
Aiswarya Bhaskar ◽  
Hans-Michael Bruns ◽  
Joerg J Schneider ◽  
...  
Keyword(s):  
Functional Groups ◽  
Superior Performance ◽  
Carbon Felt ◽  
Redox Flow Batteries ◽  
Oxygen Functional Groups ◽  
Treated Sample ◽  
Flow Batteries ◽  
N Doping ◽  
Plasma Treated Sample ◽  
Vanadium Redox

Polyacrylonitrile (PAN)-based carbon felt was subjected to N2-plasma treatment to increase the heteroatom defects and reactive edge sites as a method to increase the performance in vanadium redox flow batteries (VRFBs). N-doping in the felt was mainly in the form of pyrrolic and pyridinic nitrogen. Even though the amount of oxygen functional groups on the N2-plasma-treated sample was very low, the felt showed enhanced electrochemical performance for both V3+/V2+ as well as V5+/V4+ redox reactions. The result is highly significant as the pristine electrode with the same amount of oxygen functional groups showed significantly less activity for the V3+/V2+ redox reaction. Overall, the single-flow cell experiments with N2-plasma-treated felt showed superior performance compared to the pristine sample. Therefore, the enhanced performance observed for the N2-plasma-treated sample should be attributed to the increase in defects and edge sites. Thus, from the present study, it can be concluded that an alternate way to increase the performance of the VRFBs is to introduce specific defects such as N-doping/substitution or to increase the edge sites. In other words, defects induced in the carbon felt such as heteroatom doping are as beneficial as the presence of oxygen functional groups for the improved performance of VRFBs. Therefore, for an optimum performance of VRFBs, defects such as N-substitution as well as oxygen functionality should be tuned.

Superior Electrocatalytic Activity of a Robust Carbon-Felt Electrode with Oxygen-Rich Phosphate Groups for All-Vanadium Redox Flow Batteries

ChemSusChem ◽  
2016 ◽  
Vol 9 (11) ◽  
pp. 1329-1338 ◽  
Author(s):  
Ki Jae Kim ◽  
Heon Seong Lee ◽  
Jeonghun Kim ◽  
Min-Sik Park ◽  
Jung Ho Kim ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Carbon Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Carbon Felt Electrode ◽  
Vanadium Redox ◽  
Phosphate Groups

Graphitic C3N4as a powerful catalyst for all-vanadium redox flow batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 66368-66372 ◽  
Author(s):  
Yuqing Huang ◽  
Jia Huo ◽  
Shuo Dou ◽  
Kui Hu ◽  
Shuangyin Wang
Keyword(s):  
Electrochemical Performance ◽  
Carbon Nitride ◽  
Carbon Felt ◽  
Redox Flow Batteries ◽  
Redox Pair ◽  
Flow Batteries ◽  
Carbon Felt Electrode ◽  
Vanadium Redox

A novel carbon felt electrode modified with carbon nitride (C3N4) has been developed to improve the electrochemical performance with a VO2+/VO2+redox pair.

Activity gradient carbon felt electrodes for vanadium redox flow batteries

2018 ◽  
Vol 408 ◽  
pp. 128-135 ◽  
Author(s):  
Youngkwon Kim ◽  
Yun Young Choi ◽  
Nari Yun ◽  
Mingyu Yang ◽  
Yonghee Jeon ◽  
...  
Keyword(s):  
Carbon Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox ◽  
Felt Electrodes
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