Phosphonic acid functionalized poly(pentafluorostyrene) as polyelectrolyte membrane for fuel cell application
Date
2017Author
Atanasov, Vladimir
Kerres, Jochen
Oleynikov, Andrey
Xia, Jiabing
Lyonnard, Sandrine
Metadata
Show full item recordAbstract
In this paper we introduce polyelectrolyte membranes based on phosphonated poly(pentafluorostyrene) (PPFS) and their performances in a fuel cell. The polyelectrolytes were obtained via partial phosphonation of PPFS varying the phosphonation degree from 17 to 66%. These membranes showed a high resistance to temperature (Tdecomp. = 355–381 °C) and radical attack (96–288 h in Fenton's test). A blend membrane consisting of 82 wt% fully phosphonated PPFS and 18 wt% poly(benzimidazole) is compared to the 66% phosphonated membrane having similar ion-conductivity (σ = 57 mS cm−1 at 120 °C, 90% RH). In the fuel cell the blend showed the best performance reaching 0.40 W cm−2 against 0.34 W cm−2 for the 42 wt% phosphonated membrane and 0.35 W cm−2 for Nafion 212. Furthermore, the blend maintained its operation at potentiostatic regime (0.5 V) for 620 h without declining in its performance. The highest power density of 0.78 W cm−2 was reached for the blend with a thickness of 15 μm using humidified oxygen (RH > 90%) at the cathode side. The switch from humidified to dry gasses during operation reduced the current density down to 0.6 A cm−2, but the cell maintained under operation for 66 h
URI
http://hdl.handle.net/10394/20858https://doi.org/10.1016/j.jpowsour.2017.01.085
https://www.sciencedirect.com/science/article/pii/S0378775317300952