J Membrane Sci - accepted 31122018.pdf (3.2 MB)
Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range
journal contribution
posted on 2019-01-11, 11:10 authored by Xiaoxiao Zhang, Qingting Liu, Lei Xia, Dongyang Huang, Xudong Fu, Rong Zhang, Shengfei Hu, Feng Zhao, Xiao Li, Xujin BaoXujin Baoo broaden the operating temperature range of phosphoric acid (PA) doped
polybenzimidazole membrane-based proton exchange membrane fuel cells (PEMFCs)
toward low temperatures, a novel series of poly(2,5-benzimidazole)
(ABPBI)/sulfonated sepiolite (S-Sep) composite membranes (ABPBI/S-Sep) with low
PA doping levels (DLs) were prepared via in-situ synthesis. The desirably enhanced
mechanical, thermal, and oxidative stabilities of ABPBI/S-Sep composite membranes
were achieved by constructing ABPBI chains arranged along the sepiolite (Sep) fibers and acid-base crosslinks formed between S-Sep fibrous particles and ABPBI chains.
Benefiting from the richness of high temperature stable bound water and the excellent
water absorbability of Sep particles that enable the formation of additive proton
conducting paths, the composite membranes retained bounded PA and achieved much
higher proton conductivities under both anhydrous and hydrous conditions compared
to PA-doped ABPBI membranes. Proton conductivity values above 0.01 S/cm at
40-90 °C/20-98% RH conditions and 90-180 °C/anhydrous conditions as well as peak
power density of 0.13 and 0.23 W/cm2
at 80 and 180 °C with 0% RH, respectively
from the ABPBI/2S-Sep composite membrane are more holistic compared to Nafion
at low temperatures and polybenzimidazole-based membranes at high temperatures,
respectively. The excellent properties of ABPBI/S-Sep composite membranes suggest
them as prospective candidates for PEMFCs applications in a wide temperature range.
Funding
This work was financially supported by the Hubei Provincial Natural Science Foundation Project (Grant No. 2017CFB575) and the Hubei Provincial Key Technology R&D Program (Grant Nos. 201710A01 and 201710A14).
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
Journal of Membrane ScienceVolume
574Pages
282-298Citation
ZHANG, X. ... et al., 2018. Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range. Journal of Membrane Science, 574, pp. 282-298.Publisher
© Crown. Published by ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This paper was accepted for publication in the journal Journal of Membrane Science and the definitive published version is available at https://doi.org/10.1016/j.memsci.2018.12.085Acceptance date
2018-12-30Publication date
2018-12-31Copyright date
2019ISSN
0376-7388Publisher version
Language
- en