Protonation of sulfonated polyi(4,4′-diphenylether-1,3,4-oxadiazole) membranes

Jerusa Roeder; Dominique Gomes; Mariela L. Ponce; Volker Abetz; Suzana P. Nunes

doi:10.1002/macp.200600515

Protonation of sulfonated polyi(4,4′-diphenylether-1,3,4-oxadiazole) membranes

Jerusa Roeder, Dominique Gomes, Mariela L. Ponce, Volker Abetz, Suzana P. Nunes^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

This work describes the effect of sulfuric acid protonation on the properties of SPOD-DPE membranes using FT-IR and impedance spectroscopic analyses. The IR spectra showed the protonation of nitrogen atoms from oxadiazole rings, with a broad band complex in the region 3 000-2100 cm ^-1 with two centered peaks at 2 590 and 2 440 cm^-1. The S=O characteristic absorption bands in SPOD-DPE and sulfuric acid were specially studied in the region of 1800-900 cm^-1. The band shifts are associated to the interaction between acid groups and oxadiazole ring nitrogen atoms. The IR spectra evidenced the presence of three absorption species (HSO₄^-, SO₄^2- and free H ₂SO₄) depending on the sulfuric acid concentration. For the protonated SPOD-DPE membranes, a proton conductivity around 10 mS · cm ¹ was reached at 50 °C.

Original language	English (US)
Pages (from-to)	467-473
Number of pages	7
Journal	Macromolecular Chemistry and Physics
Volume	208
Issue number	5
DOIs	https://doi.org/10.1002/macp.200600515
State	Published - Mar 5 2007
Externally published	Yes

Keywords

Doping
FT-IR
Fuel cells
Polyoxadiazole
Proton conductivity
Protonation

ASJC Scopus subject areas

Condensed Matter Physics
Materials Chemistry
Polymers and Plastics
Physical and Theoretical Chemistry
Organic Chemistry

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10.1002/macp.200600515

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@article{37e8314197d446e5b8beeef3db53ea7b,

title = "Protonation of sulfonated polyi(4,4′-diphenylether-1,3,4-oxadiazole) membranes",

abstract = "This work describes the effect of sulfuric acid protonation on the properties of SPOD-DPE membranes using FT-IR and impedance spectroscopic analyses. The IR spectra showed the protonation of nitrogen atoms from oxadiazole rings, with a broad band complex in the region 3 000-2100 cm -1 with two centered peaks at 2 590 and 2 440 cm-1. The S=O characteristic absorption bands in SPOD-DPE and sulfuric acid were specially studied in the region of 1800-900 cm-1. The band shifts are associated to the interaction between acid groups and oxadiazole ring nitrogen atoms. The IR spectra evidenced the presence of three absorption species (HSO4-, SO42- and free H 2SO4) depending on the sulfuric acid concentration. For the protonated SPOD-DPE membranes, a proton conductivity around 10 mS · cm 1 was reached at 50 °C.",

keywords = "Doping, FT-IR, Fuel cells, Polyoxadiazole, Proton conductivity, Protonation",

author = "Jerusa Roeder and Dominique Gomes and Ponce, {Mariela L.} and Volker Abetz and Nunes, {Suzana P.}",

year = "2007",

month = mar,

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doi = "10.1002/macp.200600515",

language = "English (US)",

volume = "208",

pages = "467--473",

journal = "Macromolecular Chemistry and Physics",

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publisher = "Wiley-VCH Verlag",

number = "5",

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T1 - Protonation of sulfonated polyi(4,4′-diphenylether-1,3,4-oxadiazole) membranes

AU - Roeder, Jerusa

AU - Gomes, Dominique

AU - Ponce, Mariela L.

AU - Abetz, Volker

AU - Nunes, Suzana P.

PY - 2007/3/5

Y1 - 2007/3/5

N2 - This work describes the effect of sulfuric acid protonation on the properties of SPOD-DPE membranes using FT-IR and impedance spectroscopic analyses. The IR spectra showed the protonation of nitrogen atoms from oxadiazole rings, with a broad band complex in the region 3 000-2100 cm -1 with two centered peaks at 2 590 and 2 440 cm-1. The S=O characteristic absorption bands in SPOD-DPE and sulfuric acid were specially studied in the region of 1800-900 cm-1. The band shifts are associated to the interaction between acid groups and oxadiazole ring nitrogen atoms. The IR spectra evidenced the presence of three absorption species (HSO4-, SO42- and free H 2SO4) depending on the sulfuric acid concentration. For the protonated SPOD-DPE membranes, a proton conductivity around 10 mS · cm 1 was reached at 50 °C.

AB - This work describes the effect of sulfuric acid protonation on the properties of SPOD-DPE membranes using FT-IR and impedance spectroscopic analyses. The IR spectra showed the protonation of nitrogen atoms from oxadiazole rings, with a broad band complex in the region 3 000-2100 cm -1 with two centered peaks at 2 590 and 2 440 cm-1. The S=O characteristic absorption bands in SPOD-DPE and sulfuric acid were specially studied in the region of 1800-900 cm-1. The band shifts are associated to the interaction between acid groups and oxadiazole ring nitrogen atoms. The IR spectra evidenced the presence of three absorption species (HSO4-, SO42- and free H 2SO4) depending on the sulfuric acid concentration. For the protonated SPOD-DPE membranes, a proton conductivity around 10 mS · cm 1 was reached at 50 °C.

KW - Doping

KW - FT-IR

KW - Fuel cells

KW - Polyoxadiazole

KW - Proton conductivity

KW - Protonation

UR - http://www.scopus.com/inward/record.url?scp=34547850646&partnerID=8YFLogxK

U2 - 10.1002/macp.200600515

DO - 10.1002/macp.200600515

M3 - Article

AN - SCOPUS:34547850646

SN - 1022-1352

VL - 208

SP - 467

EP - 473

JO - Macromolecular Chemistry and Physics

JF - Macromolecular Chemistry and Physics

IS - 5

ER -

Protonation of sulfonated polyi(4,4′-diphenylether-1,3,4-oxadiazole) membranes

Abstract

Keywords

ASJC Scopus subject areas

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