Ion transfer across electrodialysis membranes in the overlimiting current range: chronopotentiometric studies

Heterogeneity of Ion-Exchange Membranes: The Effects of Membrane Heterogeneity on Transport Properties

“…The time taken for potential transition to occur after a constant current is applied is called the transition time (τ ), which is related to the concentration and the diffusion coefficient of an electrolyte. It can be expressed by the equation (4,10,11,13) …”

“…The chronopotentiometry experiment using a two-compartment cell (each of 200-mL volume) described in previous studies (13,14) was performed with 0.02 M ammonium chloride solution. The membrane was placed in a circular hole between the compartments.…”

Electrochemical behavior of new designed ion exchange membrane prepared from polymer gel in contact with redox substances: I

“…The potential was scanned in triangular wave form, and then current-potential plots were recorded. The initial potential E 0 , the peak potential E p , the peak current, I p and half-wave potential E 1/2 were obtained from cyclic voltammogram according to usual method [20,23]. The CV was carried out at a very slow scan rate (0.5 mV/s) to obtain 2.6 A peak current, in the case of bare-Au electrode.…”

“…The Au working electrode modified with membrane film was dipped in the 5 mM of redox solution. The diffusion coefficients of redox substances were measured by the cyclic voltammetry (CV) and chronopotentiometry (CP) according to the conventional methods [20,23]. Also the concentration of redox substances in the cationic exchange polymer membrane was measured by chronoamperometry (CA).…”

“…Also, we investigate the ionic transport of newly designed ion exchange membrane by using electrochemical measurements such as CV, CP and CC techniques. The electrochemical methods like cyclic voltammetry (CV), chronoamperiometry (CA), chronopotentiometry (CP), apart from being used for the electrochemical analysis purpose, can be used to elucidate the transport behavior of the redox substances at the electrode surface from solution [20][21][22][23][24][25]. The investigation of the thin film of new designed cationic and anionic polymer gel membrane, in the presence of redox system has not been clearly explained.…”