Correction: Duburg et al. Composite Polybenzimidazole Membrane with High Capacity Retention for Vanadium Redox Flow Batteries. Molecules 2021, 26, 1679

The authors wish to make the following changes to their paper [...].

The authors wish to make the following changes to their paper [1].
Explanation for the correction: We observed an error in the calculations of the vanadium (IV) diffusion values; as a result of this, the order of magnitude of these values has been corrected to 10 −9 cm 2 ·min −1 from 10 −8 cm 2 ·min −1 .

Original:
The dry weight of the membrane (w dry ) was obtained after drying it under vacuum at 55 • C for 22 h. The weight measurement was carried out in a closed vial to limit the uptake of moisture from the air. Then, the weight of the membrane in the wet state (w wet ) was determined after immersion for 2 days in deionized water or in 1.6 M vanadium in 2 M H 2 SO 4 and 0.05 M H 3 PO 4 electrolyte (SOC −50%, 3.5 oxidation state, Oxkem, Reading, United Kingdom), followed by the removal of droplets on the surface with a tissue. In this case, the wet weight was measured in a vial to reduce the evaporation of water from the membrane. Lastly, water and electrolyte uptake of pristine m-PBI and of commercial membranes NR212 and FAP-450 was calculated according to Equation (1).
To be replaced with: The dry weight of the membrane (m dry ) was obtained after drying it under vacuum at 55 • C for 22 h. The weight measurement was carried out in a closed vial to limit the uptake of moisture from the air. Then, the weight of the membrane in the wet state (m wet ) was determined after immersion for 2 days in deionized water or in 1.6 M vanadium in 2 M H 2 SO 4 and 0.05 M H 3 PO 4 electrolyte (SOC −50%, 3.5 oxidation state, Oxkem, Reading, United Kingdom), followed by the removal of droplets on the surface with a tissue. In this case, the wet weight was measured in a vial to reduce the evaporation of water from the membrane. Lastly, water and electrolyte uptake of pristine m-PBI and of commercial membranes NR212 and FAP-450 was calculated according to Equation (1).
Explanation for the correction: The change described above has been made to be in line with the commonly used scientific unit of mass (m). Original: The measurements were carried out by filling two quartz cuvettes (Hellma Analytics, Zumikon, Switzerland) with 2.5 mL of solution from the MgSO 4 flask. Each time, the measured solution was transferred back to the VOSO 4 flask to avoid significant volume changes.
To be replaced with: The measurements were carried out by filling two quartz cuvettes (Hellma Analytics, Zumikon, Switzerland) with 2.5 mL of solution from the MgSO 4 flask. Each time, the measured solution was transferred back to the MgSO 4 flask to avoid significant volume changes.
Explanation for the correction: The correction described above has been made as the measured solutions were transferred back into the MgSO 4 flask and not the VOSO 4 flask.
Original: Lastly, the change in weight (∆w) was calculated according to Equation (4). In Equation (4), w i and w f are the initial and final weight, respectively.
To be replaced with: Lastly, the change in weight (∆m) was calculated according to Equation (4). In Equation (4), m i and m f are the initial and final weight, respectively.
Explanation for the correction: The change described above has been made to be in line with the commonly used scientific unit of mass (m).
Original: Efficiencies and discharge capacity are calculated according to Equations (5)-(8). In Equations (5)-(7), Q ch and Q dis are the charges for the discharge and the charge process, while V dis and V ch are the discharge and charge volumes. In Equation (8), Q theoretical is the theoretical charge, n is the number of moles, F is the Faraday constant (96,485 C·mol −1 ), and z is the charge.
To be replaced with: Efficiencies and discharge capacity are calculated according to Equations (5)-(8). In Equations (5)-(7), Q ch and Q dis are the charges for the discharge and the charge process, while U ch and U dis are the average voltages during charge and discharge, respectively. In Equation (8), Q theoretical is the theoretical charge, n is the number of moles, F is the Faraday constant (96,485 C·mol −1 ), and z is the number of electrons associated with the electrochemical reaction.
Explanation for the correction: The changes described above were made to avoid confusion between the average voltages in the cell (U) and the unit volt (V). Furthermore, the description of this symbol was corrected to the average voltage instead of volume, which was a typing mistake. The last change was made to provide a clearer description of the symbol z as "charge" did not provide the desired clarity.
Explanation for the correction: We observed an error in the calculations of the vanadium (IV) diffusion values; as a result of this, the order of magnitude of these values has been corrected to 10 −9 cm 2 ·min −1 from 10 −8 cm 2 ·min −1 .
The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.