Browsing Faculty of Natural and Agricultural Sciences by Author "13061631 - Krüger, Andries Johannes"
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Characterisation of a polyaromatic PBI blend membrane for SO2 electrolysis
Krüger, Andries J.; Kerres, Jochen; Bessarabov, Dmitri; Krieg, Henning M.; Cichon, Patrizia (Elsevier, 2015)The application of a polyaromatic acid–base blend membrane from partially fluorinated and sulfonated aromatic polyether and the polybenzimidazole F6PBI has been investigated for hydrogen production using SO2 electrolysis. ... -
Comparison of ionically and ionical-covalently cross-linked polyaromatic membranes for SO2 electrolysis
Peach, Retha; Krieg, Henning M.; Krüger, Andries J.; Van der Westhuizen, Derik; Bessarabov, Dmitri (Elsevier, 2014)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 ... -
Effect of H2S on SO2-depolarised water electrolysis
Krüger, Andries J.; Krieg, Henning M.; Bessarabov, Dmitri (Elsevier, 2015)The performance of a PEM SO2 electrolyser, used for the production of H2 gas and liquid H2SO4, was evaluated when the feed was contaminated with hydrogen sulfide. Transient voltage response at constant current density and ... -
Evaluation of covalently and ionically cross-linked PBI-excess blends for application in SO2 electrolysis
Krüger, Andries J.; Kerres, Jochen; Bessarabov, Dmitri; Krieg, Henning M. (Elsevier, 2015)Proton 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) ... -
Evaluation of MEA manufacturing parameters using EIS for SO2 electrolysis
Krüger, Andries J.; Krieg, Henning M.; Van der Merwe, Jan; Bessarabov, Dmitri (Elsevier, 2014)Membrane electrode assembly (MEA) manufacturing parameters such as hot pressing pressure and pressing time were investigated for the use in a SO2 electrolyser. The SO2 electrolysis was optimised in terms of cell temperature, ... -
Gas crossover mitigation in PEM water electrolysis: hydrogen cross-over benchmark study of 3M's Ir-NSTF based electrolysis catalyst-coated membranes
Bessarabov, Dmitri; Krüger, Andries; Luopa, Sean M.; Park, Jiyoung; Molnar, Attila A. (ECS, 2016)In this work we present some preliminary data, such as permeability (gas crossover) of oxygen and hydrogen as a function of current density and other operational variables, aimed at establishing baselines for unmitigated ... -
Monomers, polymers and cross-linked membranes for membrane fuel cells and electrolysis
Kerres, Jochen A.; Krüger, Andries; Schoeman, Hannes; Bessarabov, Dmitri; Krieg, Henning (Electrochemical Society, 2011)This contribution comprises an overview about work in the development of ionomers/ionomer (blend) membranes for fuel cells. The topics include the development of novel sulfonated monomers and homo- and copolymers; the ... -
Novel cross-linked partially fluorinated and non-fluorinated polyaromatic PBI-containing blend membranes for SO2 electrolysis
Peach, Retha; Krieg, Henning M.; Krüger, Andries J.; Rossouw, Jacobus J.C.; Bessarabov, Dmitri; Kerres, Jochen (Elsevier, 2016)Various partially fluorinated and non-fluorinated polyaromatic and PBI blend components were covalent-ionically cross-linked to obtain proton exchange membranes that can be applied in an SO2 electrolyser. During SO2 ... -
Novel cross-linked PBI-blended membranes evaluated for high temperature fuel cell application and SO2 electrolysis
Peach, Retha; Krieg, Henning M.; Krüger, Andries J.; Bessarabov, Dmitri; Kerres, Jochen (Elsevier, 2018)Within this study various partially fluorinated polyaromatic and PBI blend components were covalent-ionically cross-linked to obtain acid and base-excess proton exchange membranes that can be applied in high temperature ... -
PBI-blended membrane evaluated in high temperature SO2 electrolyzer
Peach, Retha; Krieg, Henning; Krüger, Andries; Bessarabov, Dmitri; Kerres, Jochen A. (ECS, 2018)It has been shown that hydrogen can be produced efficiently within the membrane based Hybrid Sulfur (HyS) process, where SO2 is electrochemically oxidized in the presence of H2O to produce H2 and H2SO4. In earlier studies, ... -
Separation of alkenes with organic and inorganic composite membranes
Krüger, A.; Krieg, H.; Neomagus, H. (IChemE, 2013)In this study the separation of two alkenes, ethene and butene, which have similar physical properties, was attempted for industrial gas purification. Using both inorganic (ceramic and zeolite NaA) and polymeric (Teflon ... -
SO2 solubility in 50 wt % H2SO4 at elevated temperatures and pressures
Krüger, Andries J.; Krieg, Henning M.; Neomagus, Hein W.J.P. (ACS, 2014)The SO2 solubility at various temperatures and pressures was evaluated to determine the SO2 content in a 50 wt % H2SO4 acid solution adding new experimental solubility data for the SO2−H2SO4 binary system currently ... -
Stability of ionic-covalently cross-linked PBI-blended membranes for SO2 electrolysis at elevated temperatures
Peach, Retha; Krieg, Henning M.; Krüger, Andries J.; Bessarabov, Dmitri; Kerres, Jochen (Elsevier, 2020)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 ... -
Sulfonated poly(arylene thioether phosphine oxide)s and poly(arylene ether phosphine oxide)s PBI-blend membranes and their performance in SO2 electrolysis
Cichon, Patrizia J.; Krüger, Andries J.; Krieg, Henning M.; Bessarabov, Dmitri; Kerres, Jochen (Elsevier, 2016)As part of the global initiative for producing electricity using non-carbon based, renewable energy sources, the production of hydrogen as an energy carrier has received increased interest. One such production method is ...