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Evaluation of covalently and ionically cross-linked PBI-excess blends for application in SO2 electrolysis

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dc.contributor.authorKrüger, Andries J.
dc.contributor.authorKerres, Jochen
dc.contributor.authorBessarabov, Dmitri
dc.contributor.authorKrieg, Henning M.
dc.contributor.researchID13061631 - Krüger, Andries Johannes
dc.contributor.researchID24775290 - Kerres, Jochen A.
dc.contributor.researchID22730389 - Bessarabov, Dmitri Georgievich
dc.contributor.researchID11087137 - Krieg, Henning Manfred
dc.date.accessioned2016-07-25T10:56:57Z
dc.date.available2016-07-25T10:56:57Z
dc.date.issued2015
dc.description.abstractProton exchange membranes (PEM) containing various combinations of PPOBr (pol(2,6-dimethylbromide-1,4-phenylene oxide, covalently cross-linked) or PWN (poly(tetrafluorostyrene-4-phosphonic acid), ionically cross-linked) were evaluated for their suitability in an SO2 electrolyser environment. Since H2SO4 is produced during the oxidation of SO2 in the presence of water, the membranes used in the electrolyser must be both chemically and electrochemically stable. Acid stability tests showed that the blend membranes are stable in 80 wt % acidic media at 80 °C for 120 h. The electrochemical characterisation included polarisation curves, voltage stepping and long term operation. Using polarisation curves two blend combinations were selected for the voltage stepping. Both types of blend membranes showed high stability up to 110 cycles while the F6PBI/PPOBr blend membrane had comparable (to N115®) long term operating voltage, while the F6PBI/PWN blend membrane showed improved voltage, attaining 0.781 V compared to the 0.812 V obtained when using N115 at 0.1 A cm−2en_US
dc.description.sponsorshipDST (Department of Science and Technology, South Africa) through HySA Infrastructure CoC under project KP5 – IO03 and the DFG (Deutsche Forschungsgemeinschaft – German Research Foundation) under project number KE 673/11-1en_US
dc.identifier.citationKrüger, A.J. et al. Evaluation of covalently and ionically cross-linked PBI-excess blends for application in SO2 electrolysis. International journal of hydrogen energy, 40(29):8788-8796. [https://doi.org/10.1016/j.ijhydene.2015.05.063]en_US
dc.identifier.issn0360-3199
dc.identifier.urihttp://hdl.handle.net/10394/18037
dc.identifier.urihttps://doi.org/10.1016/j.ijhydene.2015.05.063
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0360319915012215
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectSO2 electrolysisen_US
dc.subjectF6PBI blend proton exchange membranesen_US
dc.subjectCovalently cross-linkeden_US
dc.subjectIonically cross-linkeden_US
dc.subjectVoltage steppingen_US
dc.subjectLong term operationen_US
dc.titleEvaluation of covalently and ionically cross-linked PBI-excess blends for application in SO2 electrolysisen_US
dc.typeArticleen_US

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