Stability of ionic-covalently cross-linked PBI-blended membranes for SO2 electrolysis at elevated temperatures |
| |
| Affiliation: | 1. Chemical Resource Beneficiation Faculty of Natural Sciences North-West University, Potchefstroom 2520, South Africa;2. DST HySA Infrastructure Centre of Competence, Faculty of Engineering, North-West University, Potchefstroom 2520, South Africa;3. Institute of Chemical Process Engineering, University of Stuttgart, D-70199, Stuttgart, Germany;1. Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, D-52425, Jülich, Germany;2. Faculty of Education and Arts, Nord University, Mørkvedtråkket 30, N-8049, Bodø, Norway;1. College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China;2. Research Center of Environment-Friendly Functional Materials, Ministry of Education, Huaqiao University, Xiamen 361021, China;3. College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, China;1. Département de Chimie, Biochimie et Physique and Institut de Recherche sur l''Hydrogène, Université du Québec à Trois-Rivières, Trois-Rivières, Québec, G9A 5H7, Canada;2. Département de Chimie, Université de Montréal, Montréal, Québec, H3C 3J7, Canada;1. Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan, 453007, PR China;2. Henan Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, PR China |
| |
| Abstract: | In this study, the effect of component composition on the chemical stability of the developed ionic-covalently cross-linked PBI-blended membrane concept from earlier studies for application in SO2 electrolysis at elevated temperatures (>100 °C) is further investigated. Three different acid-base ratios were studied by blending a partially fluorinated sulfonated arylene main-chain polymer (SFS) with polybenzimidazole (F6PBI) and a partially or non-fluorinated bromo-methylated polymer (BrPAE). In addition two different alkylated imidazoles (EMIm and TMIm) were included as quaternization agents. Accordingly, twelve different PBI-blended membranes were produced in this study. The suitability of these membranes for SO2 electrolysis at elevated temperatures was determined in terms of i) the H2SO4 stability (80 wt% H2SO4 at 100 °C for 120 h), (ii) the oxidative stability (Fenton's test, FT) and (iii) the organic solvent stability (extraction in N,N-Dimethylacetamide). Membranes were characterized in terms of the percentage weight, the ion exchange capacity (IEC) and the thermal stability (TGA-FTIR) changes, before and after the various treatments. Although all blended membrane types were sufficiently stable during H2SO4 treatment, proton conductivity measurements indicated that the blends containing only partially fluorinated blend components displayed superior stability (better compatibility) as well as conductivity. Cell voltages showed an improvement of up to 190 mV for operations at 120 °C compared to earlier studies conducted at 80 °C for similar PBI-blended membranes. It was established that both chemically stable and conductive PBI-blended membranes, suitable for SO2 electrolysis above 100 °C, could be obtained by varying the composition of selected polymer components. |
| |
| Keywords: | Ionic-covalently cross-linked PBI-blended membranes Operations above 100 °C |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
