Synthesis and characterization of poly(phenylene)-based anion exchange membranes for alkaline fuel cells

Michael R. Hibbs, Cy H. Fujimoto, Christopher J Cornelius

Research output: Contribution to journalArticle

336 Citations (Scopus)

Abstract

Cationic polymer membranes that conduct free anions comprise an enabling area of research for alkaline membrane fuel cells and other solid-state electrochemical devices that operate at high pH. The synthesis of anion exchange membranes based on a poly(phenylene) backbone prepared by a Diels-Alder reaction is demonstrated. The poly(phenylene)s have benzylic methyl groups that are converted to bromomethyl groups by a radical reaction. Cationic polymers result from conversion of the bromomethyl groups to ionic moieties by quaternization with trimethylamine in the solid state. The conversion to benzyltrimethylammonium groups is incomplete as evidenced by the differences between the IEC values measured by titration and the theoretical IECs based on 1H NMR measurements. The anion exchange membranes formed from these polymers have hydroxide ion conductivities as high as 50 mS/cm in liquid water, and they are stable under highly basic conditions at elevated temperatures.

Original languageEnglish (US)
Pages (from-to)8316-8321
Number of pages6
JournalMacromolecules
Volume42
Issue number21
DOIs
StatePublished - Nov 10 2009

Fingerprint

Alkaline fuel cells
Anions
Ion exchange
Negative ions
Membranes
Polymers
Titration
Fuel cells
Nuclear magnetic resonance
Water
Ions
Liquids
Temperature

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Synthesis and characterization of poly(phenylene)-based anion exchange membranes for alkaline fuel cells. / Hibbs, Michael R.; Fujimoto, Cy H.; Cornelius, Christopher J.

In: Macromolecules, Vol. 42, No. 21, 10.11.2009, p. 8316-8321.

Research output: Contribution to journalArticle

@article{92362688c45546e08e800287c8bb2bf7,
title = "Synthesis and characterization of poly(phenylene)-based anion exchange membranes for alkaline fuel cells",
abstract = "Cationic polymer membranes that conduct free anions comprise an enabling area of research for alkaline membrane fuel cells and other solid-state electrochemical devices that operate at high pH. The synthesis of anion exchange membranes based on a poly(phenylene) backbone prepared by a Diels-Alder reaction is demonstrated. The poly(phenylene)s have benzylic methyl groups that are converted to bromomethyl groups by a radical reaction. Cationic polymers result from conversion of the bromomethyl groups to ionic moieties by quaternization with trimethylamine in the solid state. The conversion to benzyltrimethylammonium groups is incomplete as evidenced by the differences between the IEC values measured by titration and the theoretical IECs based on 1H NMR measurements. The anion exchange membranes formed from these polymers have hydroxide ion conductivities as high as 50 mS/cm in liquid water, and they are stable under highly basic conditions at elevated temperatures.",
author = "Hibbs, {Michael R.} and Fujimoto, {Cy H.} and Cornelius, {Christopher J}",
year = "2009",
month = "11",
day = "10",
doi = "10.1021/ma901538c",
language = "English (US)",
volume = "42",
pages = "8316--8321",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "21",

}

TY - JOUR

T1 - Synthesis and characterization of poly(phenylene)-based anion exchange membranes for alkaline fuel cells

AU - Hibbs, Michael R.

AU - Fujimoto, Cy H.

AU - Cornelius, Christopher J

PY - 2009/11/10

Y1 - 2009/11/10

N2 - Cationic polymer membranes that conduct free anions comprise an enabling area of research for alkaline membrane fuel cells and other solid-state electrochemical devices that operate at high pH. The synthesis of anion exchange membranes based on a poly(phenylene) backbone prepared by a Diels-Alder reaction is demonstrated. The poly(phenylene)s have benzylic methyl groups that are converted to bromomethyl groups by a radical reaction. Cationic polymers result from conversion of the bromomethyl groups to ionic moieties by quaternization with trimethylamine in the solid state. The conversion to benzyltrimethylammonium groups is incomplete as evidenced by the differences between the IEC values measured by titration and the theoretical IECs based on 1H NMR measurements. The anion exchange membranes formed from these polymers have hydroxide ion conductivities as high as 50 mS/cm in liquid water, and they are stable under highly basic conditions at elevated temperatures.

AB - Cationic polymer membranes that conduct free anions comprise an enabling area of research for alkaline membrane fuel cells and other solid-state electrochemical devices that operate at high pH. The synthesis of anion exchange membranes based on a poly(phenylene) backbone prepared by a Diels-Alder reaction is demonstrated. The poly(phenylene)s have benzylic methyl groups that are converted to bromomethyl groups by a radical reaction. Cationic polymers result from conversion of the bromomethyl groups to ionic moieties by quaternization with trimethylamine in the solid state. The conversion to benzyltrimethylammonium groups is incomplete as evidenced by the differences between the IEC values measured by titration and the theoretical IECs based on 1H NMR measurements. The anion exchange membranes formed from these polymers have hydroxide ion conductivities as high as 50 mS/cm in liquid water, and they are stable under highly basic conditions at elevated temperatures.

UR - http://www.scopus.com/inward/record.url?scp=70449360127&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70449360127&partnerID=8YFLogxK

U2 - 10.1021/ma901538c

DO - 10.1021/ma901538c

M3 - Article

VL - 42

SP - 8316

EP - 8321

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 21

ER -