Boosting the performance of an anion exchange membrane by the formation of well-connected ion conducting channels

2019 ◽  
Vol 10 (22) ◽  
pp. 2822-2831 ◽  
Author(s):  
Yan Li ◽  
Jujia Zhang ◽  
Hua Yang ◽  
Shanzhong Yang ◽  
Shanfu Lu ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Chemical Structure ◽  
Anion Exchange Membrane ◽  
Efficient Strategy ◽  
Ion Conducting ◽  
Exchange Membrane

Enlarging the discrepancies between hydrophilic/hydrophobic segments in the chemical structure of an ionomer proved to be an efficient strategy to induce the formation of a microphase-separated morphology of the resulting anion exchange membrane.

scholarly journals An Investigation of a (Vinylbenzyl) Trimethylammonium and N-Vinylimidazole-Substituted Poly (Vinylidene Fluoride-Co-Hexafluoropropylene) Copolymer as an Anion-Exchange Membrane in a Lignin-Oxidising Electrolyser

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 425
Author(s):  
Patrick J. McHugh ◽  
Arindam K. Das ◽  
Alexander G. Wallace ◽  
Vaibhav Kulshrestha ◽  
Vinod K. Shahi ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Vinylidene Fluoride ◽  
Low Voltage ◽  
Anion Exchange Membrane ◽  
Cell Potential ◽  
Polymer Backbone ◽  
Capital Costs ◽  
Production Of Hydrogen ◽  
Ion Conducting ◽  
Exchange Membrane

Electrolysis is seen as a promising route for the production of hydrogen from water, as part of a move to a wider “hydrogen economy”. The electro-oxidation of renewable feedstocks offers an alternative anode couple to the (high-overpotential) electrochemical oxygen evolution reaction for developing low-voltage electrolysers. Meanwhile, the exploration of new membrane materials is also important in order to try and reduce the capital costs of electrolysers. In this work, we synthesise and characterise a previously unreported anion-exchange membrane consisting of a fluorinated polymer backbone grafted with imidazole and trimethylammonium units as the ion-conducting moieties. We then investigate the use of this membrane in a lignin-oxidising electrolyser. The new membrane performs comparably to a commercially-available anion-exchange membrane (Fumapem) for this purpose over short timescales (delivering current densities of 4.4 mA cm−2 for lignin oxidation at a cell potential of 1.2 V at 70 °C during linear sweep voltammetry), but membrane durability was found to be a significant issue over extended testing durations. This work therefore suggests that membranes of the sort described herein might be usefully employed for lignin electrolysis applications if their robustness can be improved.

Self-aggregating cationic-chains enable alkaline stable ion-conducting channels for anion-exchange membrane fuel cells

2021 ◽  
Vol 9 (1) ◽  
pp. 327-337
Author(s):  
Jianjun Zhang ◽  
Kaiyu Zhang ◽  
Xian Liang ◽  
Weisheng Yu ◽  
Xiaolin Ge ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
Anion Exchange Membrane ◽  
Side Chains ◽  
Ion Transfer ◽  
Ion Conducting ◽  
Fast Ion ◽  
Exchange Membrane

Self-aggregated cationic side chains construct efficient ion-conducting channels for fast ion transfer.

Performance and Durability of Anion Exchange Membrane Water Electrolyzers using Down-selected Polymer Electrolytes

2021 ◽  
Author(s):  
Andrew R Motz ◽  
Dongguo Li ◽  
Alex Keane ◽  
Luis Delfin Manriquez ◽  
Eun Joo Park ◽  
...  
Keyword(s):  
Physical Properties ◽  
Anion Exchange ◽  
Polymer Electrolytes ◽  
Chemical Structure ◽  
Anion Exchange Membrane ◽  
Electrochemical Devices ◽  
Stable Anion ◽  
Exchange Membrane

Over the last decade, several stable anion exchange polymer electrolytes have been developed for electrochemical devices. Herein, we investigate how the chemical structure and physical properties of polymer electrolytes affect...

scholarly journals Polystyrene-Based Hydroxide-Ion-Conducting Ionomer: Binder Characteristics and Performance in Anion-Exchange Membrane Fuel Cells

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 690
Author(s):  
Ji Eon Chae ◽  
So Young Lee ◽  
Sung Jong Yoo ◽  
Jin Young Kim ◽  
Jong Hyun Jang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
High Performance ◽  
Membrane Electrode Assembly ◽  
Exchange Capacity ◽  
Anion Exchange Membrane ◽  
Membrane Electrode ◽  
Hydroxide Ion ◽  
Ion Conducting ◽  
Exchange Membrane

Polystyrene-based polymers with variable molecular weights are prepared by radical polymerization of styrene. Polystyrene is grafted with bromo-alkyl chains of different lengths through Friedel–Crafts acylation and quaternized to afford a series of hydroxide-ion-conducting ionomers for the catalyst binder for the membrane electrode assembly in anion-exchange membrane fuel cells (AEMFCs). Structural analyses reveal that the molecular weight of the polystyrene backbone ranges from 10,000 to 63,000 g mol−1, while the ion exchange capacity of quaternary-ammonium-group-bearing ionomers ranges from 1.44 to 1.74 mmol g−1. The performance of AEMFCs constructed using the prepared electrode ionomers is affected by several ionomer properties, and a maximal power density of 407 mW cm−2 and a durability exceeding that of a reference cell with a commercially available ionomer are achieved under optimal conditions. Thus, the developed approach is concluded to be well suited for the fabrication of next-generation electrode ionomers for high-performance AEMFCs.

Denitrification of ground water by electrodialysis using a new anion exchange membrane

2000 ◽  
Vol 49 (4) ◽  
pp. 211-218
Author(s):  
F. Elhannouni ◽  
M. Belhadj ◽  
M. Taky ◽  
A. El Midaoui ◽  
L. Echihabi ◽  
...  
Keyword(s):  
Ground Water ◽  
Anion Exchange ◽  
Anion Exchange Membrane ◽  
Exchange Membrane

scholarly journals Durability of Anion Exchange Membrane Water Electolyzers

2021 ◽  
Author(s):  
Dongguo Li ◽  
Andrew R Motz ◽  
Chulsung Bae ◽  
Cy Fujimoto ◽  
Gaoqiang Yang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Anion Exchange ◽  
Low Cost ◽  
Anion Exchange Membrane ◽  
Production Technologies ◽  
Exchange Membrane

Interest in the low-cost production of clean hydrogen is growing. Anion exchange membrane water electrolyzers (AEMWEs) are considered one of the most promising sustainable hydrogen production technologies because of their...

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