Comparative analysis of single-acid and mixed-acid systems as supporting electrolyte for vanadium redox flow battery

Zarei-Jelyani, Mohammad; Loghavi, Mohammad Mohsen; Babaiee, Mohsen; Eqra, Rahim

doi:10.1007/s10800-023-01997-7

Cited by 1 publication

(2 citation statements)

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“…(ii) Research on the stability of electrolytes through the interaction of multiple additives is limited. , For example, a combination of phosphoric acid and ammonium salt has been shown to improve electrolyte stability, but the influence of multiple factors and levels is difficult to compare . (iii) Most studies have focused on using large amounts of single or multiple additives, ,, while there is limited research on the impact of low-concentration impurities, such as As ≤ 10 ppm, Sb ≤ 10 ppm, NH 4 + ≤ 20 ppm, and Si ≤ 5 ppm·m 3 /m 2 . The effect of trace impurities carried in raw materials on electrolyte performance has not been well understood.…”

Section: Introductionmentioning

confidence: 99%

“…The current research on the impact of impurities and additives on the electrolyte in VRFBs has several notable features: (i) There have been studies on the effect of adding a single additive to either the positive or negative electrolyte. − Typically, a single additive has a positive effect on the stability of one type of electrolyte and rarely has a good effect on both. (ii) Research on the stability of electrolytes through the interaction of multiple additives is limited. , For example, a combination of phosphoric acid and ammonium salt has been shown to improve electrolyte stability, but the influence of multiple factors and levels is difficult to compare .…”

Section: Introductionmentioning

confidence: 99%

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Revealing the Effects of Impurities among Phosphoric Acid Electrolytes for the Stability of All-Vanadium Redox Flow Batteries

Wu,

Liao,

Zhou

et al. 2024

ACS Appl. Energy Mater.

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Impurities in the electrolyte have a large impact on the efficiency and stability of all-vanadium redox flow batteries. Herein, this work tries to introduce the electronegativity to explain the effects of the impurities on the stability and electrochemical performance of vanadium electrolyte. The stability of vanadium sulfate acid redox flow batteries is evaluated in an orthogonal experiment with six control factors at three levels in the presence of low-concentration impurities (0−50 ppm) in phosphoric acid electrolytes. The factors affecting the stability of the positive and negative electrolytes in polypropylene tubes are ranked as follows: temperature (Temp.) > state of charge (SOC) > Al 3+ > NH 4+ > Fe 2+ > Si/F and Al 3+ > SOC > Temp. > NH 4+ > Si/F > Fe 2+ , respectively. Especially, Al 3+ impurity concentrations between 0 and 200 ppm increased the electrochemical activity and reversibility in 0.1 M H 3 PO 4 and 3 M H 2 SO 4 containing 0.1 M VOSO 4 for VO 2+ /VO 2 + couple, but decreased above 50 ppm in 0.1 M H 3 PO 4 and 3 M H 2 SO 4 containing 0.05 M V 2 (SO 4 ) 3 for V 2+ /V 3+ couple. The presence of 50 ppm of Al 3+ in the vanadium electrolyte slows down the mass transfer of the V(IV)/V(V) and V(II)/V(III) redox reactions.

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