期刊
JOURNAL OF MEMBRANE SCIENCE
卷 574, 期 -, 页码 282-298出版社
ELSEVIER
DOI: 10.1016/j.memsci.2018.12.085
关键词
Proton exchange membrane; Poly(2,5-benzimidazole); Sepiolite; Proton conductivity; Wide temperature range
资金
- Natural Science Foundation of Hubei Province, China Project [2017CFB575, 2018CFB412]
- Laboratory of Green Materials for Light Industry [201710A14, 201806A07]
To 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 degrees C/20-98% RH conditions and 90-180 degrees C/anhydrous conditions as well as peak power density of 0.13 and 0.23 W/cm(2) at 80 and 180 degrees 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.
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