TY - JOUR
T1 - Polybenzimidazole (PBI-OO) based composite membranes using sulfophenylated TiO2 as both filler and crosslinker, and their use in the HT-PEM fuel cell
AU - Krishnan, N. Nambi
AU - Lee, Sangrae
AU - Ghorpade, Ravindra V.
AU - Konovalova, Anastasiia
AU - Jang, Jong Hyun
AU - Kim, Hyoung Juhn
AU - Han, Jonghee
AU - Henkensmeier, Dirk
AU - Han, Haksoo
N1 - Funding Information:
The authors received funding from the Korea-Denmark green technology cooperative research program (GTC), and from KIST's institutional program . Appendix A
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/8/15
Y1 - 2018/8/15
N2 - 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 cm−2 was obtained, which is 76% higher than that of a c-PBI-OO based system (202 mW cm−2). To evaluate the stability of the membrane performance over time, the best performing membrane was tested for over 700 h.
AB - 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 cm−2 was obtained, which is 76% higher than that of a c-PBI-OO based system (202 mW cm−2). To evaluate the stability of the membrane performance over time, the best performing membrane was tested for over 700 h.
KW - HT-PEMFC
KW - Nanocomposite membrane
KW - PBI-OO
KW - Sulfophenylated TiO
KW - Thermal crosslinking
UR - http://www.scopus.com/inward/record.url?scp=85046869112&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2018.05.006
DO - 10.1016/j.memsci.2018.05.006
M3 - Article
AN - SCOPUS:85046869112
SN - 0376-7388
VL - 560
SP - 11
EP - 20
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
ER -