Effect of Phosphate Additive for Thermal Stability in a Vanadium Redox Flow Battery

2017 ◽  
Vol 14 (4) ◽  
Author(s):  
Sun-Hwa Yeon ◽  
Jae Young So ◽  
Jin Hee Yun ◽  
Se-Kook Park ◽  
Kyoung-Hee Shin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Precipitation Amount ◽  
Inorganic Materials ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
H2so4 Concentration ◽  
The Stability ◽  
Vanadium Redox ◽  
Blank Solution

Organic/inorganic materials are investigated as additives to improve the stability of a vanadium electrolyte for a vanadium redox flow battery (VRFB) at operating temperatures of 25 °C and 40 °C. Among these materials, the most effective additive is chosen based on the thermal stability and electrochemical performance with a long inhibition time. Through precipitation time and electrochemical measurements, the results show that the best inhibition effect is achieved by adding sodium pyrophosphate dibasic (SPD, H2Na2O7P2) as an additive at a considerably high H2SO4 concentration (3M) electrolyte, indicating an improved redox reversibility and electrochemical activity. Nonflow cell assembled with the SPD additive exhibits larger discharge capacity retentions of 40% than a blank solution with the retentions of 2% at 600 cycles at 40 °C. In the case of flow cell, the capacity retention on the SPD additive shows 55.4%, which is 5.3% higher than the blank solution at 40 °C and 180 cycles. The morphology of the precipitation is investigated by SEM, which exhibits more severe V2O5 precipitation amount on the carbon felt electrode used in the blank electrolyte at 40 °C, which causes larger capacity losses compared to cells assembled with the SPD additive electrolyte.

scholarly journals GO-modified membranes for vanadium redox flow battery

2019 ◽  
Vol 90 ◽  
pp. 01004 ◽  
Author(s):  
Saidatul Sophia ◽  
Ebrahim Abouzari Lotf ◽  
Arshad Ahmad ◽  
Pooria Moozarm Nia ◽  
Roshafima Rasit Ali
Keyword(s):  
Low Cost ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
The Stability ◽  
High Flexibility ◽  
Vanadium Redox ◽  
Vanadium Ion ◽  
Excellent Stability

Graphene oxide (GO) has attracted tremendous attention in membrane-based separation field as it can filter ions and molecules. Recently, GO-based materials have emerged as excellent modifiers for vanadium redox flow battery (VRFB) application. Its high mechanical and chemical stability, nearly frictionless surface, high flexibility, and low cost make GO-based materials as proper materials for the membranes in VRFB. In VRFB, a membrane acts as the key component to determine the performance. Therefore, employing low vanadium ion permeability with excellent stability membrane in vanadium electrolytes is important to ensure high battery performance. Herein, recent progress of GO-modified membranes for VRFB is briefly reviewed. This review begins with current membranes used for VRFB, followed by the challenges faced by the membranes. In addition, the transport mechanism of vanadium ion and the stability properties of GO-modified membranes are also discussed to enlighten the role of GO in the modified membranes.

scholarly journals Effect of Fe(III) on the positive electrolyte for vanadium redox flow battery

2019 ◽  
Vol 6 (1) ◽  
pp. 181309 ◽  
Author(s):  
Muqing Ding ◽  
Tao Liu ◽  
Yimin Zhang ◽  
Zhenlei Cai ◽  
Yadong Yang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electrochemical Behaviour ◽  
Vanadium Redox Flow Battery ◽  
Collision Probability ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Transfer Resistance ◽  
Practical Guidance ◽  
Vanadium Redox ◽  
Vanadium Ions

It is important to study the effect of Fe(III) on the positive electrolyte, in order to provide some practical guidance for the preparation and use of vanadium electrolyte. The effect of Fe(III) on the thermal stability and electrochemical behaviour of the positive electrolyte for the vanadium redox flow battery (VRFB) was investigated. When the Fe(III) concentration was above 0.0196 mol l −1 , the thermal stability of V(V) electrolyte was impaired, the diffusion coefficient of V(IV) species decreased from (2.06–3.33) × 10 −6 cm 2 s −1 to (1.78–2.88) × 10 −6 cm 2 s −1 , and the positive electrolyte exhibited a higher electrolyte resistance and a charge transfer resistance. Furthermore, Fe(III) could result in the side reaction and capacity fading, which would have a detrimental effect on battery application. With the increase of Fe(III), the collision probability of vanadium ions with Fe(III) and the competition with the redox reaction was aggravated, which would interfere with the electrode reaction, the diffusion of vanadium ions and the performance of VRFB. Therefore, this study provides some practical guidance that it is best to bring the impurity of Fe(III) below 0.0196 mol l −1 during the preparation and use of vanadium electrolyte.

Effect of organophosphorus compound additives for thermal stability on the positive electrolyte of a vanadium redox flow battery

2018 ◽  
Vol 48 (9) ◽  
pp. 1019-1030 ◽  
Author(s):  
Chang-Soo Jin ◽  
Jae-Young So ◽  
Kyoung-Hee Shin ◽  
Eun-Bi Ha ◽  
Min Jeong Choi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Organophosphorus Compound ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Vanadium Redox

scholarly journals A polyoxometalate redox flow battery: functionality and upscale

Clean Energy ◽  
2019 ◽  
Vol 3 (4) ◽  
pp. 278-287 ◽  
Author(s):  
Jochen Friedl ◽  
Felix L Pfanschilling ◽  
Matthäa V Holland-Cunz ◽  
Robert Fleck ◽  
Barbara Schricker ◽  
...  
Keyword(s):  
Large Cell ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Operational Parameters ◽  
Flow Battery ◽  
Membrane Area ◽  
Redox Flow Batteries ◽  
The Stability ◽  
Power Densities ◽  
Vanadium Redox

Abstract While redox flow batteries carry a large potential for electricity storage, specifically for regenerative energies, the current technology-prone system—the all-vanadium redox flow battery—exhibits two major disadvantages: low energy and low power densities. Polyoxometalates have the potential to mitigate both effects. In this publication, the operation of a polyoxometalate redox flow battery was demonstrated for the polyoxoanions [SiW12O40]4– (SiW12) in the anolyte and [PV14O42]9– (PV14) in the catholyte. Emphasis was laid on comparing to which extent an upscale from 25 to 1400 cm2 membrane area may impede efficiency and operational parameters. Results demonstrated that the operation of the large cell for close to 3 months did not diminish operation and the stability of polyoxometalates was unaltered.

Stability of Vanadium Electrolytes in the Vanadium Redox Flow Battery

2013 ◽  
Vol 1492 ◽  
pp. 25-31
Author(s):  
Shu-Yuan Chuang ◽  
Chih-Hsing Leu ◽  
Kan-Lin Hsueh ◽  
Chun-Hsing Wu ◽  
Hsiao-Hsuan Hsu ◽  
...  
Keyword(s):  
Oxidation Process ◽  
Negative Electrode ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Oxidation Rates ◽  
Visible Spectra ◽  
Uv Visible ◽  
The Stability ◽  
Vanadium Redox

ABSTRACTThe stability of the negative electrode electrolyte affects the efficiency and capacity of energy storage in the vanadium redox flow battery (VRFB) system. To explore the stability of vanadium electrolytes, the study prepared five types of V(II) electrolytes that were exposed to air in a fixed open area and monitored the charge state of vanadium ions over time by UV/Visible spectrophotometer. This study succeeded in preparing pure V(II) electrolytes. Five characteristics are found in the UV/Visible spectra, respectively, during the oxidation process from V(II) electrolytes to V(III) electrolytes and V(III) electrolytes to V(IV) electrolytes. The experimental results show that the oxidation rate of a solution of 1 M V(II) electrolytes to V(III) electrolytes and 1 M V(III) electrolytes to V(IV) electrolytes under an atmosphere of air is 4.79 and 0.0089 mol/h per square meter. The oxidation rates of 0.05-1 M V(II) electrolytes to V(III) electrolytes are approximately 96-538 times than that of V(III) electrolytes to V(IV) electrolytes.

Effects of Sulfuric Acid Concentration on Volume Transfer Across Ion-Exchange Membrane in a Single-Cell Vanadium Redox Flow Battery

2017 ◽  
Author(s):  
Rabiul Islam ◽  
Cameron Nolen ◽  
Kwangkook Jeong
Keyword(s):  
Large Scale ◽  
Storage Capacity ◽  
Sulfuric Acid Concentration ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
H2so4 Concentration ◽  
Membrane Transfer ◽  
Exchange Membrane ◽  
Vanadium Redox

The vanadium redox flow battery (VRFB) is one of the technologies to be used for storing large-scale renewable energy. The objective of this research is to electrochemically synthesize the V(III) electrolytes with combinations of 2 M VOSO4 and 2–6 M H2SO4, and to investigate the effects of concentration of H2SO4 on vanadium and water transfer across membrane. Transfer of water and vanadium across the membrane was reduced from 19.6 to 6.2 % as the concentration of H2SO4 in the electrolyte increased from 2 to 6 M. Change in volume transferred across the membrane decreased with each successive charge and discharge cycle, and resulted in a reduction in volume transfer from 16.7 % after the first cycle to 2.9 % after the fourth cycle. Energy storage capacity was increased by 50 % by changing the H2SO4 concentration from 2 to 6 M.

Zirconium boride as a novel negative catalyst for vanadium redox flow battery

2021 ◽  
Author(s):  
Tongxue Zhang ◽  
Yingqiao Jiang ◽  
Zixuan Zhang ◽  
Jing Xue ◽  
Yuehua Li ◽  
...  
Keyword(s):  
Vanadium Redox Flow Battery ◽  
Zirconium Boride ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Vanadium Redox
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