Effect of ion-exchange nanofiber fabrics on water splitting in bipolar membrane

2006 ◽  
Vol 300 (1) ◽  
pp. 442-445 ◽  
Author(s):  
Yuji Wakamatsu ◽  
Hidetoshi Matsumoto ◽  
Mie Minagawa ◽  
Akihiko Tanioka
Keyword(s):  
Ion Exchange ◽  
Water Splitting ◽  
Bipolar Membrane

Electrochemical Performance Evaluation of Bipolar Membrane Using Poly(phenylene oxide) for Water Treatment System

2020 ◽  
Vol 20 (11) ◽  
pp. 6797-6801
Author(s):  
Tae Yang Son ◽  
Jun Seong Yun ◽  
Kihyun Kim ◽  
Sang Yong Nam
Keyword(s):  
Tensile Strength ◽  
Ion Exchange ◽  
Water Splitting ◽  
High Efficiency ◽  
Ion Exchange Membranes ◽  
Bipolar Membrane ◽  
Porous Support ◽  
Bipolar Membranes ◽  
Phenylene Oxide ◽  
Exchange Membrane

This study describes the use of poly(phenylene oxide) polymer-based ion-exchange polymers, polystyrene-based ion-exchange particles and a porous support for fabricating bipolar membranes and the results of an assessment of the applicability of these materials to water splitting. In order to achieve good mechanical as well as good ion-exchange properties, bipolar membranes were prepared by laminating poly(phenylene oxide) and polystyrene based ion-exchange membranes with a sulfonated polystyrene-block-(ethylene-ran-butylene)-block-polystyrene) (S-SEBS) modified interface. PE pore-supported ion-exchange membranes were also used as bipolar membranes. The tensile strength was 13.21 MPa for the bipolar membrane which utilized only a cation/anion-exchange membrane. When ion-exchange nanoparticles were introduced for high efficiency, a reduction in the tensile strength to 6.81 MPa was observed. At the same time, bipolar membrane in the form of a composite membrane using PE support exhibited the best tensile strength of 32.41 MPa. To confirm the water-splitting performance, an important factor for a bipolar membrane, pH changes over a period of 20 min were also studied. During water slitting using CA-P-PE-BPM, the pH at the CEM part and the AEM part changed from 5.4 to 4.18 and from 5.4 to 5.63, respectively.

scholarly journals Water Splitting and Transport of Ions in Electromembrane System with Bilayer Ion-Exchange Membrane

Membranes ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 346 ◽  
Author(s):  
Stanislav Melnikov ◽  
Denis Bondarev ◽  
Elena Nosova ◽  
Ekaterina Melnikova ◽  
Victor Zabolotskiy
Keyword(s):  
Ion Exchange ◽  
Water Splitting ◽  
Surface Film ◽  
Effective Rate Constant ◽  
Effective Rate ◽  
Limiting Current ◽  
Ion Exchange Membranes ◽  
Bipolar Membranes ◽  
The Matrix ◽  
Exchange Membrane

Bilayer ion-exchange membranes are mainly used for separating single and multiply charged ions. It is well known that in membranes in which the layers have different charges of the ionogenic groups of the matrix, the limiting current decreases, and the water splitting reaction accelerates in comparison with monolayer (isotropic) ion-exchange membranes. We study samples of bilayer ion-exchange membranes with very thin cation-exchange layers deposited on an anion-exchange membrane-substrate in this work. It was revealed that in bilayer membranes, the limiting current’s value is determined by the properties of a thin surface film (modifying layer). A linear regularity of the dependence of the non-equilibrium effective rate constant of the water-splitting reaction on the resistance of the bipolar region, which is valid for both bilayer and bipolar membranes, has been revealed. It is shown that the introduction of the catalyst significantly reduces the water-splitting voltage, but reduces the selectivity of the membrane. It is possible to regulate the fluxes of salt ions and water splitting products (hydrogen and hydroxyl ions) by changing the current density. Such an ability makes it possible to conduct a controlled process of desalting electrolytes with simultaneous pH adjustment.

Transparent Bipolar Membrane for Water Splitting Applications

2017 ◽  
Vol 9 (32) ◽  
pp. 26749-26755 ◽  
Author(s):  
Sakineh Chabi ◽  
Andrew G. Wright ◽  
Steven Holdcroft ◽  
Michael S. Freund
Keyword(s):  
Water Splitting ◽  
Bipolar Membrane

Preparation and Characterization of CMC-PVA/PVA-SA-MePc (COOH)8/CS-PVA Bipolar Membrane Using Electrospinning Technique

2013 ◽  
Vol 774-776 ◽  
pp. 795-798
Author(s):  
Ting Jin Zhou ◽  
Min Lu ◽  
Ri Yao Chen
Keyword(s):  
Polyvinyl Alcohol ◽  
Water Splitting ◽  
Current Density ◽  
Voltage Drop ◽  
High Current Density ◽  
High Current ◽  
Bipolar Membrane ◽  
Electrospinning Technique ◽  
Exchange Layer

Carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVA) and chitosan (CS)-polyvinyl alcohol were cross-linked by Fe3+and glutaraldehyde respectively to prepare cation exchange layer and anion exchange layer, and polyvinyl alcohol-sodium alginate (SA)-metal octocarboxyphthalocyanine (MePc (COOH)8, a kind of water splitting catalyst, here, Me stands for Fe3+or Co2+) nanofibers were prepared by electrospinning technique and introduced into the interlayer to obtain the CMC-PVA/PVA-SA-MePc (COOH)8/CS-PVA bipolar membrane (BPM). The experimental results showed that compared with the BPM without the PVA-SA-MePc (COOH)8interlayer, the water splitting efficiency at the interlayer of the CMC-PVA/PVA-SA-MePc (COOH)8/ CS-PVA BPM was obviously increased, and its membrane impedance decreased. When the concentration of FePc (COOH)8in the PVA-SA-FePc (COOH)8nanofibers was 3.0%, the trans-membrane voltage drop (IRdrop) of the CMC-PVA/PVA-SA-FePc (COOH)8/CS-PVA BPM was as low as 0.6V at a high current density of 90 mA/cm2.

Preparation and enhanced photoelectrochemical performance of selenite-sensitized zinc oxide core/shell composite structure

2015 ◽  
Vol 3 (8) ◽  
pp. 4239-4247 ◽  
Author(s):  
Tiantian Hong ◽  
Zhifeng Liu ◽  
Hui Liu ◽  
Junqi Liu ◽  
Xueqi Zhang ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Ion Exchange ◽  
Chemical Synthesis ◽  
Water Splitting ◽  
Low Cost ◽  
Core Shell ◽  
Nanorod Arrays ◽  
Photoelectrochemical Performance ◽  
Vertically Aligned ◽  
Shell Composite

A fast, versatile and low-cost hydrothermal chemical synthesis based on ion-exchange has been used to deposit a shell of cupric selenite onto vertically aligned zinc oxide nanorod arrays with a buffer layer of zinc selenite for photoelectrochemical water splitting.

scholarly journals Promoting water-splitting in Janus bipolar ion-exchange resin wafers for electrodeionization

2020 ◽  
Vol 5 (5) ◽  
pp. 922-935 ◽  
Author(s):  
Matthew L. Jordan ◽  
Lauren Valentino ◽  
Nargiza Nazyrynbekova ◽  
Varada Menon Palakkal ◽  
Subarna Kole ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Ion Exchange ◽  
Water Splitting ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Separation Processes ◽  
Separation Technology ◽  
Electrochemical Separation

Electrochemical separation processes are undergoing a renaissance as the range of applications continue to expand because they offer opportunities for increased energy efficiency and sustainability in comparison to conventional separation technology.

scholarly journals How Electrical Heterogeneity Parameters of Ion-Exchange Membrane Surface Affect the Mass Transfer and Water Splitting Rate in Electrodialysis

2020 ◽  
Vol 21 (3) ◽  
pp. 973 ◽  
Author(s):  
Svetlana Zyryanova ◽  
Semyon Mareev ◽  
Violetta Gil ◽  
Elizaveta Korzhova ◽  
Natalia Pismenskaya ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Ion Exchange ◽  
Water Splitting ◽  
Transfer Rate ◽  
Membrane Surface ◽  
Mass Transfer Rate ◽  
Anion Exchange Membranes ◽  
Experimental Conditions ◽  
Electrospinning Technique ◽  
Diffusion Layer Thickness

Electrodialysis (ED) has been demonstrated as an effective membrane method for desalination, concentration, and separation. Electroconvection (EC) is a phenomenon which can essentially increase the mass transfer rate and reduce the undesirable water splitting effect. Efforts by a number of researchers are ongoing to create conditions for developing EC, in particular, through the formation of electrical heterogeneity on the membrane surface. We attempt, for the first time, to optimize the parameters of surface electrical heterogeneity for ion-exchange membranes used in a laboratory ED cell. Thirteen different patterns on the surface of two Neosepta anion-exchange membranes, AMX and AMX-Sb, were tested. Low-conductive fluoropolymer spots were formed on the membrane surface using the electrospinning technique. Spots in the form of squares, rectangles, and circles with different sizes and distances between them were applied. We found that the spots’ shape did not have a visible effect. The best effect, i.e., the maximum mass transfer rate and the minimum water splitting rate, was found when the spots’ size was close to that of the diffusion layer thickness, δ (about 250 μm in the experimental conditions), and the distance between the spots was slightly larger than δ, such that the fraction of the screened surface was about 20%.

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