Highly conductive and chemically stable alkaline anion exchange membranes via ROMP of trans -cyclooctene derivatives
Abstract
Alkaline anion exchange membranes (AAEMs) are an important component of alkaline exchange membrane fuel cells (AEMFCs), which facilitate the efficient conversion of fuels to electricity using nonplatinum electrode catalysts. However, low hydroxide conductivity and poor long-term alkaline stability of AAEMs are the major limitations for the widespread application of AEMFCs. In this paper, we report the synthesis of highly conductive and chemically stable AAEMs from the living polymerization of trans -cyclooctenes. A trans -cyclooctene–fused imidazolium monomer was designed and synthesized on gram scale. Using these highly ring-strained monomers, we produced a range of block and random copolymers. Surprisingly, AAEMs made from the random copolymer exhibited much higher conductivities than their block copolymer analogs. Investigation by transmission electron microscopy showed that the block copolymers had a disordered microphase segregation which likely impeded ion conduction. A cross-linked random copolymer demonstrated a high level of hydroxide conductivity (134 mS/cm at 80 °C). More importantly, the membranes exhibited excellent chemical stability due to the incorporation of highly alkaline-stable multisubstituted imidazolium cations. No chemical degradation was detected by 1 H NMR spectroscopy when the polymers were treated with 2 M KOH in CD 3 OH at 80 °C for 30 d.
- Publication Date:
- Research Org.:
- Cornell Univ., Ithaca, NY (United States). Energy Frontier Research Center (EFRC) Center for Alkaline-Based Energy+B11:C29 Solutions (CABES)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1509916
- Alternate Identifier(s):
- OSTI ID: 1566669
- Grant/Contract Number:
- SC0019445
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; alkaline anion exchange membrane; trans-cyclooctene; block and random copolymer; cross-linked polymer; transmission electron microscopy
Citation Formats
You, Wei, Padgett, Elliot, MacMillan, Samantha N., Muller, David A., and Coates, Geoffrey W. Highly conductive and chemically stable alkaline anion exchange membranes via ROMP of trans -cyclooctene derivatives. United States: N. p., 2019.
Web. doi:10.1073/pnas.1900988116.
You, Wei, Padgett, Elliot, MacMillan, Samantha N., Muller, David A., & Coates, Geoffrey W. Highly conductive and chemically stable alkaline anion exchange membranes via ROMP of trans -cyclooctene derivatives. United States. https://doi.org/10.1073/pnas.1900988116
You, Wei, Padgett, Elliot, MacMillan, Samantha N., Muller, David A., and Coates, Geoffrey W. Mon .
"Highly conductive and chemically stable alkaline anion exchange membranes via ROMP of trans -cyclooctene derivatives". United States. https://doi.org/10.1073/pnas.1900988116.
@article{osti_1509916,
title = {Highly conductive and chemically stable alkaline anion exchange membranes via ROMP of trans -cyclooctene derivatives},
author = {You, Wei and Padgett, Elliot and MacMillan, Samantha N. and Muller, David A. and Coates, Geoffrey W.},
abstractNote = {Alkaline anion exchange membranes (AAEMs) are an important component of alkaline exchange membrane fuel cells (AEMFCs), which facilitate the efficient conversion of fuels to electricity using nonplatinum electrode catalysts. However, low hydroxide conductivity and poor long-term alkaline stability of AAEMs are the major limitations for the widespread application of AEMFCs. In this paper, we report the synthesis of highly conductive and chemically stable AAEMs from the living polymerization of trans -cyclooctenes. A trans -cyclooctene–fused imidazolium monomer was designed and synthesized on gram scale. Using these highly ring-strained monomers, we produced a range of block and random copolymers. Surprisingly, AAEMs made from the random copolymer exhibited much higher conductivities than their block copolymer analogs. Investigation by transmission electron microscopy showed that the block copolymers had a disordered microphase segregation which likely impeded ion conduction. A cross-linked random copolymer demonstrated a high level of hydroxide conductivity (134 mS/cm at 80 °C). More importantly, the membranes exhibited excellent chemical stability due to the incorporation of highly alkaline-stable multisubstituted imidazolium cations. No chemical degradation was detected by 1 H NMR spectroscopy when the polymers were treated with 2 M KOH in CD 3 OH at 80 °C for 30 d.},
doi = {10.1073/pnas.1900988116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 29 00:00:00 EDT 2019},
month = {Mon Apr 29 00:00:00 EDT 2019}
}
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