Direct addition of sulfur and nitrogen functional groups to graphite felt electrodes for improving all-vanadium redox flow battery performance

2019 ◽  
Vol 297 ◽  
pp. 905-915 ◽  
Author(s):  
Andrew B. Shah ◽  
Yihui Wu ◽  
Yong Lak Joo
Keyword(s):  
Functional Groups ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Graphite Felt ◽  
Direct Addition ◽  
Vanadium Redox ◽  
Felt Electrodes

scholarly journals Characteristics of Graphite Felt Electrodes Treated by Atmospheric Pressure Plasma Jets for an All-Vanadium Redox Flow Battery

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3847
Author(s):  
Tossaporn Jirabovornwisut ◽  
Bhupendra Singh ◽  
Apisada Chutimasakul ◽  
Jung-Hsien Chang ◽  
Jian-Zhang Chen ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jets ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Graphite Felt ◽  
Vanadium Redox ◽  
Felt Electrodes

In an all-vanadium redox flow battery (VRFB), redox reaction occurs on the fiber surface of the graphite felts. Therefore, the VRFB performance highly depends on the characteristics of the graphite felts. Although atmospheric pressure plasma jets (APPJs) have been applied for surface modification of graphite felt electrode in VRFBs for the enhancement of electrochemical reactivity, the influence of APPJ plasma reactivity and working temperature (by changing the flow rate) on the VRFB performance is still unknown. In this work, the performance of the graphite felts with different APPJ plasma reactivity and working temperatures, changed by varying the flow rates (the conditions are denoted as APPJ temperatures hereafter), was analyzed and compared with those treated with sulfuric acid. X-ray photoelectron spectroscopy (XPS) indicated that the APPJ treatment led to an increase in O-/N-containing functional groups on the GF surface to ~21.0% as compared to ~15.0% for untreated GF and 18.0% for H2SO4-treated GF. Scanning electron microscopy (SEM) indicated that the surface morphology of graphite felt electrodes was still smooth, and no visible changes were detected after oxidation in the sulfuric acid or after APPJ treatment. The polarization measurements indicated that the APPJ treatment increased the limiting current densities from 0.56 A·cm−2 for the GFs treated by H2SO4 to 0.64, 0.68, and 0.64 A·cm−2, respectively, for the GFs APPJ-treated at 450, 550, and 650 °C, as well as reduced the activation overpotential when compared with the H2SO4-treated electrode. The electrochemical charge/discharge measurements showed that the APPJ treatment temperature of 550 °C gave the highest energy efficiency of 83.5% as compared to 72.0% with the H2SO4 treatment.

High efficiency of CO 2 -activated graphite felt as electrode for vanadium redox flow battery application

2017 ◽  
Vol 364 ◽  
pp. 1-8 ◽  
Author(s):  
Yu-Chung Chang ◽  
Jian-Yu Chen ◽  
Daniel Manaye Kabtamu ◽  
Guan-Yi Lin ◽  
Ning-Yih Hsu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Graphite Felt ◽  
Vanadium Redox ◽  
Battery Application

HF/H2O2 treated graphite felt as the positive electrode for vanadium redox flow battery

2017 ◽  
Vol 423 ◽  
pp. 111-118 ◽  
Author(s):  
Zhangxing He ◽  
Yingqiao Jiang ◽  
Wei Meng ◽  
Fengyun Jiang ◽  
Huizhu Zhou ◽  
...  
Keyword(s):  
Positive Electrode ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Graphite Felt ◽  
Vanadium Redox

An electrochemically activated graphite electrode with excellent kinetics for electrode processes of V(ii)/V(iii) and V(iv)/V(v) couples in a vanadium redox flow battery

RSC Advances ◽  
2014 ◽  
Vol 4 (98) ◽  
pp. 55666-55670 ◽  
Author(s):  
Huijun Liu ◽  
Lingxu Yang ◽  
Qian Xu ◽  
Chuanwei Yan
Keyword(s):  
Functional Groups ◽  
Graphite Electrode ◽  
Electrochemical Activity ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Electrode Processes ◽  
Redox Couples ◽  
Vanadium Redox ◽  
Vanadium Ion

The electrochemical activity and the reversibility for electrode processes of vanadium ion redox couples are significantly enhanced on an EAGE, which is due to the functional groups of COOH and CO introduced on its surface.

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