Polybenzimidazole (PBI-OO) based composite membranes using sulfophenylated TiO2 as both filler and crosslinker, and their use in the HT-PEM fuel cell
- Polybenzimidazole (PBI-OO) based composite membranes using sulfophenylated TiO2 as both filler and crosslinker, and their use in the HT-PEM fuel cell
- 한종희; 김형준; 장종현; 헨켄스마이어디억; 아나스타시아; N. Nambi Krishnan; Sangrae Lee; Ravindra V. Ghorpade; Haksoo Han
- HT-PEMFC; Nanocomposite membrane; PBI-OO; Sulfophenylated TiO2; Thermal crosslinking
- Issue Date
- Journal of membrane science
- VOL 560-20
- Crosslinked metal oxide containing nanocomposite membranes, in which the filler also acts as crosslinker, were prepared by blending polybenzimidazole (PBI-OO) and phenylsulfonated TiO2 particles (s-TiO2). Thermal curing changes the ionically crosslinked system into a covalently crosslinked system. The synthesized s-TiO2 nanoparticles were analyzed by thermal gravimetric analysis and scanning electron microscopy. The covalently crosslinked nanocomposite membranes (c-sTiO2-PBI-OO) were doped with phosphoric acid (PA) for high temperature proton exchange membrane fuel cell (HT-PEMFC) application. The membrane properties, such as PA uptake, dimensional change, gel content, proton conductivity, mechanical property, and single cell performance were evaluated and compared with the properties of acid-doped c-PBI-OO. PA doped 6-c-sTiO2-PBI-OO (6  wt% sTiO2) showed the highest uptake of 392  wt%, and a proton conductivity at 160  °C of 98  mS  cm− 1. In the fuel cell, a peak power density of 356  mW  2 was obtained, which is 76% higher than that of a c-PBI-OO based system (202  2). To evaluate the stability of the membrane performance over time, the best performing membrane was tested for over 700  h.
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