Characterization and comparison of organic functional groups effects on electrolyte performance for vanadium redox flow battery
Ling Ge1,2,3,4, Tao Liu1,2,3,4(), Yimin Zhang1,2,3,4, Hong Liu1,2,3,4
1. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China 2. State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan University of Science and Technology, Wuhan 430081, China 3. Collaborative Innovation Center of Strategic Vanadium Resources Utilization, Wuhan University of Science and Technology, Wuhan 430081, China 4. Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan University of Science and Technology, Wuhan 430081, China
The vanadium redox flow battery with a safe and capacity-controllable large-scale energy storage system offers a new method for the sustainability. In this case, acetic acid, methane sulfonic acid, sulfonic acid, amino methane sulfonic acid, and taurine are used to overcome the low electrolyte energy density and stability limitations, as well as to investigate the effects of various organic functional groups on the vanadium redox flow battery. When compared to the pristine electrolyte (0.22 Ah, 5.0 Wh·L–1, 85.0%), the results show that taurine has the advantage of maintaining vanadium ion concentrations, discharge capacity (1.43 Ah), energy density (33.9 Wh·L–1), and energy efficiency (90.5%) even after several cycles. The acetic acid electrolyte is more conducive to the low-temperature stability of the V(II) electrolyte (177 h at −25 °C) than pristine (82 h at −2 °C). The –SO3H group, specifically the coaction of the –NH2 and –SO3H groups, improves electrolyte stability. The –NH2 and –COOH additive groups improved conductivity and electrochemical activity.
. [J]. Frontiers of Chemical Science and Engineering, 2023, 17(9): 1221-1230.
Ling Ge, Tao Liu, Yimin Zhang, Hong Liu. Characterization and comparison of organic functional groups effects on electrolyte performance for vanadium redox flow battery. Front. Chem. Sci. Eng., 2023, 17(9): 1221-1230.
Vanadium concentration of solution after precipitation/(mol·L–1)
25 °C V(V)
40 °C V(V)
50 °C V(V)
–25 °C V(II)
40 °C
50 °C
Pristine
S
58
6
82
1.62
0.93
MSA
S
60
6
86
1.64
0.93
SAA
S
66
7
92
1.79
0.96
AMSA
S
72
9
136
1.95
1.02
TAU
S
82
10
116
1.98
1.15
GAA
S
70
8
177
1.79
0.97
Tab.1
Fig.1
Fig.2
Sample
Oxidation peak
Reduction peak
?Epc/V
Jpa/Jpc
Jpa/(mA·cm–2)
Epa/V
Jpc/(mA·cm–2)
Epc/V
None
65.03
1.206
44.59
0.744
0.46
1.46
MSA
66.57
1.161
47.51
0.833
0.33
1.40
SAA
70.17
1.167
50.78
0.825
0.34
1.38
AMSA
66.86
1.180
47.99
0.819
0.36
1.39
TAU
70.58
1.171
51.27
0.817
0.35
1.38
GAA
69.23
1.180
50.34
0.808
0.37
1.38
Tab.2
Fig.3
Circuit component
Sample
Pristine
MSA
SAA
AMSA
GAA
TAU
R1/Ω
3.621
2.342
2.129
2.172
2.009
2.089
C/mF
0.690
3.538
3.862
3.241
3.412
3.517
R2/Ω
6.4 × 10–3
1.6 × 10–3
1.1 × 10–3
1.3 × 10–3
1.9 × 10–4
7.6 × 10–4
(W, Y0)/(S·s–5·cm2)
3.7 × 10–2
5.2 × 10–2
5.5 × 10–2
5.3 × 10–2
6.1 × 10–2
5.9 × 10–2
Chi-squared/χ2
4.4 × 10–3
4.0 × 10–3
3.7 × 10–3
3.2 × 10–3
2.7 × 10–3
2.9 × 10–3
Tab.3
Fig.4
Fig.5
Fig.6
Fig.7
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