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Title: Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range
Authors: Zhang, Xiaoxiao
Liu, Qingting
Xia, Lei
Huang, Dongyang
Fu, Xudong
Zhang, Rong
Hu, Shengfei
Zhao, Feng
Li, Xiao
Bao, Xujin
Keywords: Proton exchange membrane
Poly(2,5-benzimidazole)
Sepiolite
Proton conductivity
Wide temperature range
Issue Date: 2018
Publisher: © Crown. Published by Elsevier
Citation: 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.
Abstract: o 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.
Description: This paper is in closed access until 31st December 2019.
Sponsor: 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).
Version: Accepted for publication
DOI: 10.1016/j.memsci.2018.12.085
URI: https://dspace.lboro.ac.uk/2134/36542
Publisher Link: https://doi.org/10.1016/j.memsci.2018.12.085
ISSN: 0376-7388
Appears in Collections:Closed Access (Materials)

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