Krishnana, N. Nambi Lee, Sangrae Ghorpade, Ravindra V. Konovalova, Anastasiia Jang, Jong Hyun Kim, Hyoung-Juhn Han, Jonghee Henkensmeier, Dirk Han, Haksoo 2024-01-19T22:04:10Z 2024-01-19T22:04:10Z 2021-09-03 2018-08 0376-7388 https://pubs.kist.re.kr/handle/201004/121111 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-sTiO(2)-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-sTiO(2)-PBI-OO (6 wt% sTiO(2)) showed the highest uptake of 392 wt%, and a proton conductivity at 160 degrees C of 98 mS cm(-1). In the fuel cell, a peak power density of 356mWcm(-2) was obtained, which is 76% higher than that of a c-PBI-OO based system (202mWcm(-2)). To evaluate the stability of the membrane performance over time, the best performing membrane was tested for over 700 h. English ELSEVIER Polybenzimidazole (PBI-OO) based composite membranes using sulfophenylated TiO2 as both filler and crosslinker, and their use in the HT-PEM fuel cell Article 10.1016/j.memsci.2018.05.006 1 JOURNAL OF MEMBRANE SCIENCE, v.560, pp.11 - 20 JOURNAL OF MEMBRANE SCIENCE 560 11 20 N scie scopus 000433255000002 2-s2.0-85046869112 Engineering, Chemical Polymer Science Engineering Polymer Science Article ACID DOPED POLYBENZIMIDAZOLE POLYMER ELECTROLYTE MEMBRANES EXCHANGE MEMBRANE POLY(VINYLBENZYL CHLORIDE) POLYSULFONE MEMBRANES SURFACE MODIFICATION PROTON CONDUCTIVITY SIDE-GROUPS PERFORMANCE PYRIDINE PBI-OO Sulfophenylated TiO2 Thermal crosslinking HT-PEMFC Nanocomposite membrane