| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1277174 | International Journal of Hydrogen Energy | 2012 | 12 Pages |
For hydrogen to become a serious contender for replacing fossil fuels, the manufacturing thereof has to be further investigated. One such process, the membrane based Hybrid Sulfur (HyS) process, where hydrogen is produced from the electrolysis of SO2, has received considerable interest recently. Since H2SO4 is formed during SO2 electrolysis, H2SO4 stability is a prerequisite for any membrane to be used in this process. In this study, pure as well as blended polybenzimidazole (PBI), partially fluorinated poly(arylene ether) (sFS) and nonfluorinated poly(arylene ethersulfone) (sPSU) membranes were investigated in terms of their acid stability as a function of acid concentration. Membranes were characterized using weight change, TGA, GPC, SEM/EDX and IEC. While a general stability was observed at 30 and 60 wt% H2SO4, the blended sFS-PBI and sPSU-PBI showed the highest stability throughout. According to the VI curve obtained for the SO2 electrolysis, the sPSU-PBI blend membrane performed slightly better than Nafion®117.
► H2SO4 stability of PBI based membranes was tested for SO2 electrolysis. ► sFS-PBI and sPSU-PBI membranes were stable at 30 & 60 wt% H2SO4. ► sPSU-PBI performed better than Nafion®117 during SO2 electrolysis.
