Comparison of ionically and ionical-covalently cross-linked polyaromatic membranes for SO2 electrolysis |
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| Authors: | Retha Peach Henning M Krieg Andries J Krüger Derik van der Westhuizen Dmitri Bessarabov Jochen Kerres |
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| Affiliation: | 1. Focus Area: Chemical Resource Beneficiation Faculty of Natural Science, North-West University, Potchefstroom 2520, South Africa;2. DST HySA Infrastructure Centre of Competence, North-West University, Potchefstroom 2520, South Africa;3. Institute of Chemical Process Engineering, University of Stuttgart, D-70199 Stuttgart, Germany |
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| Abstract: | It has been shown that hydrogen, which can be used for energy storage, can be produced efficiently by the membrane based Hybrid Sulfur (HyS) process. During the HyS electrolysis step, SO2 and H2O are converted to H2 and H2SO4, which implies that membranes to be used for this process should have both a high proton conductivity and acid stability. In this study ionic and ionic-covalently cross-linked polybenzimidazole (PBI) blended membranes were investigated and compared with Nafion®212 in terms of their acid stability. Characterization of the membranes, which included monitoring the change in weight, swelling, SEM/EDX, TEM, TGA-MS, FTIR and IEC before and after H2SO4 treatment showed that all tested membranes were stable in 80 wt% H2SO4 at 80 °C for 120 h. Subsequent HyS electrolysis showed that the blend membranes performed better than Nafion®115 at current densities below 0.3 A/cm2, while performing similar above 0.3 A/cm2. |
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| Keywords: | PBI based blend membranes H2SO4 stability HyS electrolysis |
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