Abstract
Anion conducting polymers are potentially interesting for fuel cells, electrochemical pumps, and dye sensitized solar cells. Ether-containing polybenzimidazoles (PBI-OO and PBI-OPO) were synthesized and turned into anion conducting polymers by methylation. The thermal stability was shown to depend on the polymer structure and degree of methylation (dom). Tensile strength and modulus decrease between 50% and 75% dom, but stay constant or slightly increase over 75% dom again. At 65 C, hydroxide, iodide, chloride, carbonate and bicarbonate conductivities of 0.1, 0.6, 19, 20, 31 mS/cm were obtained, respectively. The low hydroxide conductivity is due to the formation of a C-O bond in position 2 of the imidazolium, which reduces the number of free ions and is known to lead to imidazolium ring opening and further degradation steps. The effect of introduction of phenoxy groups into the main chain on the charge distribution, especially on position 2 and the methyl groups (positive charge on the methyl groups decreases the thermal stability), as well as on the ion bonding was thoroughly investigated by DFT calculations and correlated with experimental data.
| Original language | English |
|---|---|
| Pages (from-to) | 2842-2853 |
| Number of pages | 12 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 39 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2014 Feb 14 |
| Externally published | Yes |
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Keywords
- Anion conductivity
- Anion exchange membrane
- DFT calculation
- Imidazolium
- Polybenzimidazole
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology
Cite this
Anion conducting polymers based on ether linked polybenzimidazole (PBI-OO). / Henkensmeier, Dirk; Cho, Hyeongrae; Brela, Mateusz; Michalak, Artur; Dyck, Alexander; Germer, Wiebke; Duong, Ngoc My Hanh; Jang, Jong Hyun; Kim, Hyoung Juhn; Nam, SukWoo; Lim, Tae Hoon.
In: International Journal of Hydrogen Energy, Vol. 39, No. 6, 14.02.2014, p. 2842-2853.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Anion conducting polymers based on ether linked polybenzimidazole (PBI-OO)
AU - Henkensmeier, Dirk
AU - Cho, Hyeongrae
AU - Brela, Mateusz
AU - Michalak, Artur
AU - Dyck, Alexander
AU - Germer, Wiebke
AU - Duong, Ngoc My Hanh
AU - Jang, Jong Hyun
AU - Kim, Hyoung Juhn
AU - Nam, SukWoo
AU - Lim, Tae Hoon
PY - 2014/2/14
Y1 - 2014/2/14
N2 - Anion conducting polymers are potentially interesting for fuel cells, electrochemical pumps, and dye sensitized solar cells. Ether-containing polybenzimidazoles (PBI-OO and PBI-OPO) were synthesized and turned into anion conducting polymers by methylation. The thermal stability was shown to depend on the polymer structure and degree of methylation (dom). Tensile strength and modulus decrease between 50% and 75% dom, but stay constant or slightly increase over 75% dom again. At 65 C, hydroxide, iodide, chloride, carbonate and bicarbonate conductivities of 0.1, 0.6, 19, 20, 31 mS/cm were obtained, respectively. The low hydroxide conductivity is due to the formation of a C-O bond in position 2 of the imidazolium, which reduces the number of free ions and is known to lead to imidazolium ring opening and further degradation steps. The effect of introduction of phenoxy groups into the main chain on the charge distribution, especially on position 2 and the methyl groups (positive charge on the methyl groups decreases the thermal stability), as well as on the ion bonding was thoroughly investigated by DFT calculations and correlated with experimental data.
AB - Anion conducting polymers are potentially interesting for fuel cells, electrochemical pumps, and dye sensitized solar cells. Ether-containing polybenzimidazoles (PBI-OO and PBI-OPO) were synthesized and turned into anion conducting polymers by methylation. The thermal stability was shown to depend on the polymer structure and degree of methylation (dom). Tensile strength and modulus decrease between 50% and 75% dom, but stay constant or slightly increase over 75% dom again. At 65 C, hydroxide, iodide, chloride, carbonate and bicarbonate conductivities of 0.1, 0.6, 19, 20, 31 mS/cm were obtained, respectively. The low hydroxide conductivity is due to the formation of a C-O bond in position 2 of the imidazolium, which reduces the number of free ions and is known to lead to imidazolium ring opening and further degradation steps. The effect of introduction of phenoxy groups into the main chain on the charge distribution, especially on position 2 and the methyl groups (positive charge on the methyl groups decreases the thermal stability), as well as on the ion bonding was thoroughly investigated by DFT calculations and correlated with experimental data.
KW - Anion conductivity
KW - Anion exchange membrane
KW - DFT calculation
KW - Imidazolium
KW - Polybenzimidazole
UR - http://www.scopus.com/inward/record.url?scp=84895061289&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84895061289&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2013.07.091
DO - 10.1016/j.ijhydene.2013.07.091
M3 - Article
AN - SCOPUS:84895061289
VL - 39
SP - 2842
EP - 2853
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 6
ER -