Transparent Bipolar Membrane for Water Splitting Applications

Chabi, Sakineh; Wright, Andrew G.; Holdcroft, Steven; Freund, Michael S.

doi:10.1021/acsami.7b04402

Cited by 47 publications

(57 citation statements)

References 44 publications

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“…As the experiment continued, the experiment reached a steady state, and the voltage of the BP-A-C-BP configuration tended to be higher than that of the BP-A-BP configuration. At the end of the experiment, the voltage developed in a stable direction in the BP-A-BP configuration, while in the BP-A-C-BP configuration, the voltage reflected a rising trend because of the high concentration of H 2 SO 4 in the acid compartment [29].…”

Section: Effect Of Membrane Stack Configurationmentioning

confidence: 96%

“…In the BP-A-BP configuration, the concentration of H 2 SO 4 was equal to twice the number of moles of hydrogen produced in the acid compartment subtracted by the acid loss caused by the competition with the hydroxide ions; these hydroxide ions generated from the salt compartment could pass across the anion exchange membrane and neutralize with hydrogen ions. However, the feed concentration played a buffer role in the BP-A-C-BP configuration, which reduced the undesirable influence [29,30].…”

Section: Effect Of Membrane Stack Configurationmentioning

confidence: 99%

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The Novel Strategy for Increasing the Efficiency and Yield of the Bipolar Membrane Electrodialysis by the Double Conjugate Salts Stress

et al. 2020

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To improve sulfuric acid recovery from sodium sulfate wastewater, a lab-scale bipolar membrane electrodialysis (BMED) process was used for the treatment of simulated sodium sulfate wastewater. In order to increase the concentration of sulfuric acid (H2SO4) generated during the process, a certain concentration of ammonium sulfate solution was added into the feed compartment. To study the influencing factors of sulfuric acid yield, we prepared different concentrations of ammonium sulfate solution, different feed solution volumes, and different membrane configurations in this experiment. As it can be seen from the results, when adding 8% (NH4)2SO4 into 15% Na2SO4 under the experimental conditions where the current density was 50 mA/cm2, the concentration of H2SO4 increased from 0.89 to 1.215 mol/L, and the current efficiency and energy consumption could be up to 60.12% and 2.59 kWh/kg, respectively. Furthermore, with the increase of the volume of the feed compartment, the concentration of H2SO4 also increased. At the same time, the configuration also affects the final concentration of the sulfuric acid; in the BP-A-C-BP (“BP” means bipolar membrane, “A” means anion exchange membrane, and “C” means cation exchange membrane; “BP-A-C-BP” means that two bipolar membranes, an anion exchange membrane, and a cation exchange membrane are alternately arranged to form a repeating unit of the membrane stack) configuration, a higher H2SO4 concentration was generated and less energy was consumed. The results show that the addition of the double conjugate salt is an effective method to increase the concentration of acid produced in the BMED process.

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Section: Effect Of Membrane Stack Configurationmentioning

confidence: 96%

Section: Effect Of Membrane Stack Configurationmentioning

confidence: 99%

The Novel Strategy for Increasing the Efficiency and Yield of the Bipolar Membrane Electrodialysis by the Double Conjugate Salts Stress

et al. 2020

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“…Due to their high selectivity, they have been successfully used in a number of applications. Very interesting is the recently discovered possibility to convert sunlight into ionic electricity with bipolar membranes [ 283 ] and to apply this energy for CO 2 reduction [ 284 ] and for water electrolysis [ 285 , 286 , 287 , 288 , 289 , 290 , 291 , 292 ]. The use of bipolar membranes is also advantageous in reverse electrodialysis [ 293 ] and in storage of electrical energy using flow batteries [ 294 ].…”

Section: Membranes With Modified Surfacementioning

confidence: 99%

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Стенина

Голубенко

Nikonenko

et al. 2020

IJMS

125

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Nowadays, ion-exchange membranes have numerous applications in water desalination, electrolysis, chemistry, food, health, energy, environment and other fields. All of these applications require high selectivity of ion transfer, i.e., high membrane permselectivity. The transport properties of ion-exchange membranes are determined by their structure, composition and preparation method. For various applications, the selectivity of transfer processes can be characterized by different parameters, for example, by the transport number of counterions (permselectivity in electrodialysis) or by the ratio of ionic conductivity to the permeability of some gases (crossover in fuel cells). However, in most cases there is a correlation: the higher the flux density of the target component through the membrane, the lower the selectivity of the process. This correlation has two aspects: first, it follows from the membrane material properties, often expressed as the trade-off between membrane permeability and permselectivity; and, second, it is due to the concentration polarization phenomenon, which increases with an increase in the applied driving force. In this review, both aspects are considered. Recent research and progress in the membrane selectivity improvement, mainly including a number of approaches as crosslinking, nanoparticle doping, surface modification, and the use of special synthetic methods (e.g., synthesis of grafted membranes or membranes with a fairly rigid three-dimensional matrix) are summarized. These approaches are promising for the ion-exchange membranes synthesis for electrodialysis, alternative energy, and the valuable component extraction from natural or waste-water. Perspectives on future development in this research field are also discussed.

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“…One special research interest is bipolar membrane water splitting. 51 In addition to conventional preparation methods (e.g., casting technique), researchers are also exploring other novel technologies, such as electrospinning to control the layer thickness precisely. 52 Another very promising topic is water electrolysis membranes.…”

Section: Title Analysismentioning

confidence: 99%