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High performing hydroxide exchange membranes with flexible tetra-piperidinium side chains linked by alkyl spacers

Dang, Hai Son LU and Jannasch, Patric LU (2018) In ACS Applied Energy Materials 1(5). p.2222-2231
Abstract
The objective of the present work is to, in a single material, combine a number of molecular design strategies that have proven successful in the preparation of high-performance anionexchange membranes (AEMs) for alkaline fuel cells. Hence, we here report on highly conductive and alkali-stable poly(phenylene oxide)s carrying flexible side chains attached via alkyl spacer units, where each side chain contains four quaternary piperidinium (QPip) cations with interconnecting alkyl chain segments. These materials are completely soluble in, e.g., methanol and form mechanically tough transparent AEMs with efficiently segregated ions, as indicated by X-ray scattering. At 80 °C, the hydroxide ion conductivity reaches up to 170 and 221 mS... (More)
The objective of the present work is to, in a single material, combine a number of molecular design strategies that have proven successful in the preparation of high-performance anionexchange membranes (AEMs) for alkaline fuel cells. Hence, we here report on highly conductive and alkali-stable poly(phenylene oxide)s carrying flexible side chains attached via alkyl spacer units, where each side chain contains four quaternary piperidinium (QPip) cations with interconnecting alkyl chain segments. These materials are completely soluble in, e.g., methanol and form mechanically tough transparent AEMs with efficiently segregated ions, as indicated by X-ray scattering. At 80 °C, the hydroxide ion conductivity reaches up to 170 and 221 mS cm-1 at ion exchange capacities (IECs) of 2.1 and 2.6 mequiv g-1, respectively. Taking into account the IEC value and water uptake, the tetra-QPip side chain AEMs are found to be significantly more efficient hydroxide ion conductors than corresponding AEMs with mono-QPip side chains. Both the IEC value and hydroxide conductivity of the AEMs show a minor decrease after storage in 1 M aq NaOH at 90 °C during 240 h. However, this decline is not associated with any ionic loss or polymer structure degradation, as confirmed by 1H NMR spectroscopy and thermogravimetrical analysis, even after 380 h storage under the same conditions. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS Applied Energy Materials
volume
1
issue
5
pages
10 pages
publisher
American Chemical Society (ACS)
ISSN
2574-0962
DOI
10.1021/acsaem.8b00294
language
English
LU publication?
yes
id
5cae9f5b-dc4b-4afc-bd24-586efb8600eb
date added to LUP
2018-04-20 23:37:23
date last changed
2018-11-21 21:39:28
@article{5cae9f5b-dc4b-4afc-bd24-586efb8600eb,
  abstract     = {The objective of the present work is to, in a single material, combine a number of molecular design strategies that have proven successful in the preparation of high-performance anionexchange membranes (AEMs) for alkaline fuel cells. Hence, we here report on highly conductive and alkali-stable poly(phenylene oxide)s carrying flexible side chains attached via alkyl spacer units, where each side chain contains four quaternary piperidinium (QPip) cations with interconnecting alkyl chain segments. These materials are completely soluble in, e.g., methanol and form mechanically tough transparent AEMs with efficiently segregated ions, as indicated by X-ray scattering. At 80 °C, the hydroxide ion conductivity reaches up to 170 and 221 mS cm<sup>-1</sup> at ion exchange capacities (IECs) of 2.1 and 2.6 mequiv g<sup>-1</sup>, respectively. Taking into account the IEC value and water uptake, the tetra-QPip side chain AEMs are found to be significantly more efficient hydroxide ion conductors than corresponding AEMs with mono-QPip side chains. Both the IEC value and hydroxide conductivity of the AEMs show a minor decrease after storage in 1 M aq NaOH at 90 °C during 240 h. However, this decline is not associated with any ionic loss or polymer structure degradation, as confirmed by <sup>1</sup>H NMR spectroscopy and thermogravimetrical analysis, even after 380 h storage under the same conditions. },
  author       = {Dang, Hai Son and Jannasch, Patric},
  issn         = {2574-0962},
  language     = {eng},
  number       = {5},
  pages        = {2222--2231},
  publisher    = {American Chemical Society (ACS)},
  series       = {ACS Applied Energy Materials},
  title        = {High performing hydroxide exchange membranes with flexible tetra-piperidinium side chains linked by alkyl spacers},
  url          = {http://dx.doi.org/10.1021/acsaem.8b00294},
  volume       = {1},
  year         = {2018},
}