Evaluation of Electrochemical Stability of Sulfonated Anthraquinone-Based Acidic Electrolyte for Redox Flow Battery Application.

Despite intense research in the field of aqueous organic redox flow batteries, low molecular stability of electroactive compounds limits further commercialization. Additionally, currently used methods typically cannot differentiate between individual capacity fade mechanisms, such as degradation of electroactive compound and its cross-over through the membrane. We present a more complex method for in situ evaluation of (electro)chemical stability of electrolytes using a flow electrolyser and a double half-cell including permeation measurements of electrolyte cross-over through a membrane by a UV-VIS spectrometer.

A complex four-point method for the evaluation of ohmic and faradaic losses within a redox flow battery single-cell.

We propose a complex 4-point method for characterization of flow batteries. The distribution of ohmic and faradaic losses within a single-cell is evaluated from electrochemical impedance spectra and load curves of positive and negative half-cells measured with platinum wire pseudo-reference electrodes positioned in respective electrode compartment. The developed method can be used e.

[Diagnostic and therapeutic problems in carcinoma of the esophagus and cardia].

The authors describe their experience with the treatment of 180 patients with tumours of the oesophagus and cardia, during a 13-year period, at the Surgical Clinic, Medical Faculty, Comenius University, Bratislava. Most frequently the tumorous process was in the median portion of the oesophagus. A radical operation could be performed only in 27.