Journal Article10.1021/ACS.JPCC.6B09205
Understanding Anion, Water, and Methanol Transport in a Polyethylene-b-poly(vinylbenzyl trimethylammonium) Copolymer Anion-Exchange Membrane for Electrochemical Applications
Himanshu N. Sarode,Yuan Yang,Andrew R. Motz,Yifan Li,Daniel M. Knauss,Soenke Seifert,Andrew M. Herring +6 more
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TL;DR: In this paper, the anion and water transport properties of an anion-exchange membrane (AEM) comprising a block copolymer of polyethylene and poly(vinylbenzyl trimethylammonium) with an ion exchange capacity (IEC) of 1.08 mequiv/g were reported.
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Abstract: Herein, we report the anion and water transport properties of an anion-exchange membrane (AEM) comprising a block copolymer of polyethylene and poly(vinylbenzyl trimethylammonium) (PE-b-PVBTMA) with an ion-exchange capacity (IEC) of 1.08 mequiv/g. The conductivity varied little among the anions CO32–, HCO3–, and F–, with a value of Ea ≈ 20 kJ/mol and a maximum fluoride conductivity of 34 mS/cm at 90 °C and 95% relative humidity. The Br– conductivity showed a transition at 60 °C. Pulsed gradient stimulated spin echo nuclear magnetic resonance (PGSE NMR) experiments showed that water diffusion in this AEM is heterogeneous and is affected by the anion present, being fastest in the presence of F–. We determined the methanol self-diffusion in this membrane and observed that it is lower than that in Nafion 117, because of the lower water uptake. This article reports the first measurements of 13C-labeled bicarbonate self-diffusion in an AEM using PGSE NMR spectrometry, which was found to be significantly slower ...
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Citations
Poly(arylene ether ketone) Copolymer Grafted with Amine Groups Containing a Long Alkyl Chain by Chloroacetylation for Improved Alkaline Stability and Conductivity of Anion Exchange Membrane
Geetanjali Shukla,Vinod K. Shahi +1 more
- 20 Feb 2018
TL;DR: In this paper, a simple and controllable acetylation of poly(arylene ether ketone) (PK) followed by Menshutkin reaction (quaternization) is reported to prepare a highly alkaline stable and conductive (phase-separated) anion exchange membrane (AEM).
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High-performance membrane for vanadium redox flow batteries: Cross-linked poly(ether ether ketone) grafted with sulfonic acid groups via the spacer
TL;DR: In this article, a new cross-linking agent grafted with SO3H groups via side chain spacer by sultone group ring-opening reaction was proposed for vanadium redox flow battery applications.
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Effect of CO2 absorption on ion and water mobility in an anion exchange membrane
TL;DR: In this article, the authors measured water uptake, density, ionic conductivity and water transport properties in Tokuyama A201 membrane in OH−, HCO3− and Cl− forms.
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A Polyethylene-Based Triblock Copolymer Anion Exchange Membrane with High Conductivity and Practical Mechanical Properties
Nora Catherine Buggy,Yifeng Du,Mei-Chen Kuo,Kayla A. Ahrens,Jacob S. Wilkinson,Soenke Seifert,E. Bryan Coughlin,Andrew M. Herring +7 more
- 04 Feb 2020
TL;DR: In this article, a challenge in anion exchange membrane (AEM) development is simultaneously optimizing alkaline chemical stability and mechanical integrity during thermal and humidity cycling and achieving high ani...
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Phase separated nanofibrous anion exchange membranes with polycationic side chains
Ebrahim Abouzari-Lotf,Hossein Ghassemi,Mohamed Mahmoud Nasef,Mohamed Mahmoud Nasef,Arshad Ahmad,Masoumeh Zakeri,Teo M. Ting,Ali Abbasi,Shahram Mehdipour-Ataei +8 more
TL;DR: In this paper, the authors demonstrate a simple and efficient strategy of using nanofibrous materials, activated by radiation and functionalized with ionic groups to fabricate highly durable and conductive membranes with polycationic side chains.
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Spin diffusion measurements : spin echoes in the presence of a time-dependent field gradient
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TL;DR: In this article, a derivation of the effect of a time-dependent magnetic field gradient on the spin-echo experiment, particularly in the presence of spin diffusion, is given.
Anion-exchange membranes in electrochemical energy systems
John R. Varcoe,Plamen Atanassov,Dario R. Dekel,Andrew M. Herring,Michael A. Hickner,Paul A. Kohl,Anthony Kucernak,William E. Mustain,DC Kitty Nijmeijer,Keith Scott,Tongwen Xu,L Lin Zhuang +11 more
TL;DR: In this paper, an up-to-date perspective on the use of anion-exchange membranes in fuel cells, electrolysers, redox flow batteries, reverse electrodialysis cells, and bioelectrochemical systems (e.g. microbial fuel cells).
Water Uptake by and Transport Through Nafion® 117 Membranes
Thomas A. Zawodzinski,C. R. Derouin,Susan D. Radzinski,Ruth J. Sherman,Van T. Smith,T. E. Springer,Shimshon Gottesfeld +6 more
TL;DR: In this article, the diffusion coefficient and relaxation time of water in the membrane and the protonic conductivity of the membrane as functions of membrane water content were measured, and the ratio of water molecules carried across the membrane per proton transported, the electro-osmotic drag coefficient, was determined for a limited number of water contents.
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