Spectroelectrochemical Detection of Water Dissociation in Bipolar Membranes

2021 ◽  
Author(s):  
Amelia Hohenadel ◽  
Apurva Shantilal Gangrade ◽  
Steven Holdcroft
Keyword(s):  
Water Dissociation ◽  
Bipolar Membranes

Bipolar membrane polarization behavior with systematically varied interfacial areas in the junction region

2021 ◽  
Author(s):  
Subarna Kole ◽  
Gokul Venugopalan ◽  
Deepra Bhattacharya ◽  
Le Zhang ◽  
John Cheng ◽  
...  
Keyword(s):  
Electric Field ◽  
Water Dissociation ◽  
Bipolar Membrane ◽  
Junction Region ◽  
Bipolar Membranes ◽  
Membrane Polarization ◽  
Interfacial Areas ◽  
Left Image ◽  
The Right ◽  
The Relationship

Left image is the relationship for the overpotential for water dissociation as a function of bipolar junction electric field whereas the right image presents micrographs and the procedure to make bipolar membranes with micropatterned interfaces.

Electrochemical Impedance Spectroscopy as a Performance Indicator of Water Dissociation in Bipolar Membranes

2019 ◽  
Author(s):  
marijn blommaert ◽  
david vermaas ◽  
boaz izelaar ◽  
ben in't veen ◽  
wilson smith
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Performance Indicator ◽  
Electrochemical Impedance ◽  
In Situ Monitoring ◽  
Water Dissociation ◽  
Bipolar Membranes ◽  
Salt Ions ◽  
And Migration

Using electrochemical impedance spectroscopy (EIS), we observed the rate of water dissociation decrease in the presence of salt ions while also observing the diffusion and migration of these salt ions, showing a clear link between the peaks observed in EIS and ion crossover. In addition, we show how EIS can be used to in-situ monitor the stability and ageing of a BPM, revealing that degradation of the BPM is more prominent in extreme pH electrolyte pairs compared to non-extreme electrolyte pairs. The in-situ monitoring of the WDR and stability of a BPM are vital methods for adequate and consistent comparison of novel designs of BPM-based systems, where EIS allows for discriminating BPM characteristics from other components even during operation. <br>

In-situ grown polyaniline catalytic interfacial layer improves water dissociation in bipolar membranes

2021 ◽  
pp. 119167
Author(s):  
Geng Li ◽  
Muhammad A. Shehzad ◽  
Zijuan Ge ◽  
Huijuan Wang ◽  
Aqsa Yasmin ◽  
...  
Keyword(s):  
Interfacial Layer ◽  
Water Dissociation ◽  
Bipolar Membranes

Effect of added salt and increase in ionic strength on skim milk electroacidification performances

2001 ◽  
Vol 68 (2) ◽  
pp. 237-250 ◽  
Author(s):  
LAURENT BAZINET ◽  
DENIS IPPERSIEL ◽  
CHRISTINE GENDRON ◽  
BEHZAD MAHDAVI ◽  
JEAN AMIOT ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Protein Profile ◽  
Skim Milk ◽  
Operation Time ◽  
Water Dissociation ◽  
Bipolar Membrane ◽  
Cathode Voltage ◽  
Experimental Conditions ◽  
Bipolar Membranes ◽  
Added Salt

Bipolar-membrane electroacidification (BMEA) technology, which uses the property of bipolar membranes to split water and the demineralization action of cation-exchange membranes (CEM), was tested for the production of acid casein. BMEA has numerous advantages in comparison with conventional isoelectric precipitation processes of proteins used in the dairy industry. BMEA uses electricity to generate the desired ionic species to acidify the treated solutions. The process can be precisely controlled, as electro-acidification rate is regulated by the effective current density in the cell. Water dissociation at the bipolar membrane interface is continuous and avoids local excess of acid. In-situ generation of dangerous chemicals (acids and bases) reduces the risks associated with the handling, transportation, use and elimination of these products. The aim of this study was to evaluate the performance of BMEA in different conditions of added ionic strength (μadded = 0, 0·25, 0·5 and 1·0 M) and added salt (CaCl2, NaCl and KCl).The combination of KCl and μadded = 0·5 M gave the best results with a 45% decrease in energy consumption. The increased energy efficiency was the result of a decrease in the anode/cathode voltage difference. This was due to an increase of conductivity, produced by addition of salt, necessary to compensate for the lack of sufficiently mobile ions in the skim milk. However, the addition of salts, irrespective of type or ionic strength, increased the required operation time. The protein profile of isolates were similar under all experimental conditions, except at 1·0 M-CaCl2.

Modelling water dissociation, acid-base neutralization and ion transport in bipolar membranes for acid-base flow batteries

2022 ◽  
Vol 641 ◽  
pp. 119899
Author(s):  
Arturo Ortega ◽  
Luis F. Arenas ◽  
Joep J.H. Pijpers ◽  
Diana L. Vicencio ◽  
Juan C. Martínez ◽  
...  
Keyword(s):  
Ion Transport ◽  
Base Flow ◽  
Water Dissociation ◽  
Acid Base ◽  
Bipolar Membranes ◽  
Flow Batteries

scholarly journals Modeling the electrochemical behavior and interfacial junction profiles of bipolar membranes at solar flux relevant operating current densities

2021 ◽  
Vol 5 (7) ◽  
pp. 2149-2158
Author(s):  
Meng Lin ◽  
Ibadillah A. Digdaya ◽  
Chengxiang Xiang
Keyword(s):  
Chemical Reactions ◽  
Electrochemical Behavior ◽  
Solar Flux ◽  
Water Dissociation ◽  
Bipolar Membranes ◽  
Operating Current ◽  
Current Densities ◽  
Physics Model ◽  
And Diffusion

A 1D, multi-physics model that accounts for the migration and diffusion of species, electrostatics, and chemical reactions, in particular water dissociation, at BPM interfaces was developed to study the electrochemical behavior.

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