scholarly journals Investigating the suitability of poly tetraarylphosphonium based anion exchange membranes for electrochemical applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Muthumeenal Arunachalam ◽  
Alessandro Sinopoli ◽  
Farida Aidoudi ◽  
Stephen E. Creager ◽  
Rhett Smith ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Anion Exchange ◽  
Mechanical Stability ◽  
Precious Metals ◽  
Composite Membranes ◽  
Anion Exchange Membranes ◽  
Capital Costs ◽  
Alkaline Environment ◽  
Alkaline Stability ◽  
Electrochemical Applications

AbstractAnion exchange membranes (AEMs) are becoming increasingly common in electrochemical energy conversion and storage systems around the world (EES). Proton-/cation-exchange membranes (which conduct positive charged ions such as H+ or Na+) have historically been used in many devices such as fuel cells, electrolysers, and redox flow batteries. High capital costs and the use of noble metal catalysts are two of the current major disadvantages of polymer electrolyte membrane (PEM)-based systems. AEMs may be able to overcome the limitations of conventional PEMs. As a result, polymers with anion exchange properties have recently attracted a lot of attention due to their significant benefits in terms of transitioning from a highly acidic to an alkaline environment, high kinetics for oxygen reduction and fuel oxidation in an alkaline environment, and lower cost due to the use of non-precious metals. The aim of this research was to learn more about the development of a new AEM based on poly tetraarylphosphonium ionomers (pTAP), which has high ionic conductivity, alkaline stability, thermal stability, and good mechanical properties, making it a more cost-effective and stable alternative to conventional and commercial AEMs. A simple solution casting method was used to build novel anion exchange composite membranes with controlled thicknesses using the synthesized pTAP with polysulfone (PS). To ensure their suitability for use as an electrolyte in alkaline electrochemical systems, the composite membranes were characterized using FTIR, XRD, water uptake, ionic conductivity, and alkaline stability. At 40 °C, the PS/pTAP 40/60 percent membrane had a maximum ionic conductivity of 4.2 mS/cm. The thermal and mechanical stability of the composite membranes were also examined, with no substantial weight loss observed up to 150 °C. These findings pave the way for these membranes to be used in a wide variety of electrochemical applications.

Assessing the influence of different cation chemistries on ionic conductivity and alkaline stability of anion exchange membranes

2012 ◽  
Vol 22 (9) ◽  
pp. 3733 ◽  
Author(s):  
Christopher G. Arges ◽  
Javier Parrondo ◽  
Graham Johnson ◽  
Athrey Nadhan ◽  
Vijay Ramani
Keyword(s):  
Ionic Conductivity ◽  
Anion Exchange ◽  
Anion Exchange Membranes ◽  
Alkaline Stability

Highly conductive fluorine-based anion exchange membranes with robust alkaline durability

2020 ◽  
Vol 8 (26) ◽  
pp. 13065-13076
Author(s):  
Xue Lang Gao ◽  
Li Xuan Sun ◽  
Hong Yue Wu ◽  
Zhao Yu Zhu ◽  
Nan Xiao ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Energy Conversion ◽  
Anion Exchange ◽  
High Ionic Conductivity ◽  
Anion Exchange Membranes ◽  
Alkaline Stability ◽  
Electrochemical Energy Conversion ◽  
Energy Conversion Devices ◽  
Electrochemical Energy

Anion exchange membranes (AEMs) with robust alkaline stability and high ionic conductivity are imminently required for the promising electrochemical energy conversion devices – fuel cells.

Anion conducting multiblock copolymer membranes with partial fluorination and long head-group tethers

2016 ◽  
Vol 4 (41) ◽  
pp. 16233-16244 ◽  
Author(s):  
Lisha Liu ◽  
John Ahlfield ◽  
Andrew Tricker ◽  
Deryn Chu ◽  
Paul A. Kohl
Keyword(s):  
Ionic Conductivity ◽  
Anion Exchange ◽  
High Ionic Conductivity ◽  
Head Group ◽  
Anion Exchange Membranes ◽  
Multiblock Copolymer ◽  
Alkaline Stability ◽  
Long Head

Multiblock copolymer with long head-group tethers were synthesized as anion exchange membranes with high ionic conductivity and good alkaline stability.

scholarly journals Anion-exchange membranes with polycationic alkyl side chains attached via spacer units

2016 ◽  
Vol 4 (43) ◽  
pp. 17138-17153 ◽  
Author(s):  
Hai-Son Dang ◽  
Patric Jannasch
Keyword(s):  
Anion Exchange ◽  
Ion Conductivity ◽  
Side Chains ◽  
Anion Exchange Membranes ◽  
Hydroxide Ion ◽  
Alkaline Stability ◽  
Phenylene Oxide ◽  
Alkyl Side Chains

Poly(phenylene oxide)s carrying pendant polycationic alkyl side chains with a suitable configuration show high hydroxide ion conductivity and excellent alkaline stability.

scholarly journals A theoretical study of how C2-substitution affects alkaline stability in imidazolium-based anion exchange membranes

2015 ◽  
Vol 278 ◽  
pp. 5-10 ◽  
Author(s):  
Ryo Tsuchitani ◽  
Hiroshi Nakanishi ◽  
Hideyuki Shishitani ◽  
Susumu Yamaguchi ◽  
Hirohisa Tanaka ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Theoretical Study ◽  
Anion Exchange Membranes ◽  
Alkaline Stability

Crosslinked metallo-polyelectrolytes with enhanced flexibility and dimensional stability for anion-exchange membranes

2020 ◽  
Vol 11 (28) ◽  
pp. 4542-4546 ◽  
Author(s):  
Tianyu Zhu ◽  
Chuanbing Tang
Keyword(s):  
Ionic Conductivity ◽  
Anion Exchange ◽  
Dimensional Stability ◽  
Anion Exchange Membranes

We report a class of crosslinked metallo-polyelectrolytes as anion exchange membranes with exceptional mechanical flexibility, dimensional stability and ionic conductivity.

scholarly journals Electrowinning of Iron from Spent Leaching Solutions Using Novel Anion Exchange Membranes

Membranes ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 137
Author(s):  
Wouter Dirk Badenhorst ◽  
Cloete Rossouw ◽  
Hyeongrae Cho ◽  
Jochen Kerres ◽  
Dolf Bruinsma ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Anion Exchange ◽  
Mechanical Stability ◽  
Specific Energy Consumption ◽  
Flow Cell ◽  
Process Efficiency ◽  
Side Reactions ◽  
Anion Exchange Membranes ◽  
Acid Generation ◽  
Exchange Membrane

In the Pyror process, electrowinning (EW) is used to recover acid and iron from spent leaching solutions (SLS), where a porous Terylene membrane acts as a separator between the cathode and anode. In this study, a novel anion exchange membrane (AEM)-based EW process is benchmarked against a process without and with a porous Terylene membrane by comparing the current efficiency, specific energy consumption (SEC), and sulfuric acid generation using an in-house constructed EW flow cell. Using an FAP-PK-130 commercial AEM, it was shown that the AEM-based process was more efficient than the traditional processes. Subsequently, 11 novel polybenzimidazole (PBI)-based blend AEMs were compared with the commercial AEM. The best performing novel AEM (BM-5), yielded a current efficiency of 95% at an SEC of 3.53 kWh/kg Fe, which is a 10% increase in current efficiency and a 0.72 kWh/kg Fe decrease in SEC when compared to the existing Pyror process. Furthermore, the use of the novel BM-5 AEM resulted in a 0.22 kWh/kg Fe lower SEC than that obtained with the commercial AEM, also showing mechanical stability in the EW flow cell. Finally, it was shown that below 5 g/L Fe, side reactions at the cathode resulted in a decrease in process efficiency, while 40 g/L yielded the highest efficiency and lowest SECs.

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