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Jens Noack; Nataliya Roznyatovskaya; Chris Menictas; Maria Skyllas-Kazacos; Jens Tübke. Vanadium/Oxygen Systems for Energy Storage. ECS Meeting Abstracts 2021, MA2021-01, 26 -26.
AMA StyleJens Noack, Nataliya Roznyatovskaya, Chris Menictas, Maria Skyllas-Kazacos, Jens Tübke. Vanadium/Oxygen Systems for Energy Storage. ECS Meeting Abstracts. 2021; MA2021-01 (1):26-26.
Chicago/Turabian StyleJens Noack; Nataliya Roznyatovskaya; Chris Menictas; Maria Skyllas-Kazacos; Jens Tübke. 2021. "Vanadium/Oxygen Systems for Energy Storage." ECS Meeting Abstracts MA2021-01, no. 1: 26-26.
For the application in Fe/Fe-Redox-Flow-Batteries some important factors concerning the composition of the electrolyte and the influence of temperature on the properties of half-cell reactions were investigated. In contrast to previous investigations, the measurements were performed more realistically on deposited iron and by means of linear sweep voltammetry. Since the distinction between cathodic iron deposition and hydrogen generation is not possible by convention, with quantitative stripping analysis on a rotating disk electrode, partly a method was used to distinguish between these two reactions. The investigations were carried out at temperatures up to 80°C, with 10 mM additives of Bi, Cu, In, Pb, Sn, Tl, Cd, Sb and Hg and different supporting salts of NH4+, Li+, K+. Na+, Cs+, Mg2+ and Al3+.
Jens Noack; Max Berkers; Jens Ortner; Karsten Pinkwart. The Influence of Some Electrolyte Additives on the Electrochemical Performance of Fe/Fe2+ Redox Reactions for Iron/Iron Redox Flow Batteries. Journal of The Electrochemical Society 2021, 168, 040529 .
AMA StyleJens Noack, Max Berkers, Jens Ortner, Karsten Pinkwart. The Influence of Some Electrolyte Additives on the Electrochemical Performance of Fe/Fe2+ Redox Reactions for Iron/Iron Redox Flow Batteries. Journal of The Electrochemical Society. 2021; 168 (4):040529.
Chicago/Turabian StyleJens Noack; Max Berkers; Jens Ortner; Karsten Pinkwart. 2021. "The Influence of Some Electrolyte Additives on the Electrochemical Performance of Fe/Fe2+ Redox Reactions for Iron/Iron Redox Flow Batteries." Journal of The Electrochemical Society 168, no. 4: 040529.
Different Fe/Fe redox flow batteries were constructed and investigated. The aim of the work was to assess the feasibility of Fe/Fe redox flow batteries as potentially inexpensive candidates for stationary energy storage for renewable energy. A recombination cell was developed and integrated into the battery. The recombination cell should prevent irreversible loss of capacity caused by hydrogen generation. Furthermore, electrolyte regeneration experiments with external hydrogen were conducted to reverse irreversible losses. With the battery and recombination cell up to 100 two-hour charge and discharge cycles were carried out and different materials were investigated. Different substrate materials for iron deposition were compared and different microporous and ion exchange membranes were used. A kynol fabric achieved the best performance and all membranes investigated showed potential applications. An optimized battery achieved up to 70% energy efficiency at 12.5 mA/cm² and max. 47 mW/cm² power density at 75 mA/cm².
Jens Noack; Mike Wernado; Nataliya Roznyatovskaya; Jens Ortner; Karsten Pinkwart. Studies on Fe/Fe Redox Flow Batteries with Recombination Cell. Journal of The Electrochemical Society 2020, 167, 160527 .
AMA StyleJens Noack, Mike Wernado, Nataliya Roznyatovskaya, Jens Ortner, Karsten Pinkwart. Studies on Fe/Fe Redox Flow Batteries with Recombination Cell. Journal of The Electrochemical Society. 2020; 167 (16):160527.
Chicago/Turabian StyleJens Noack; Mike Wernado; Nataliya Roznyatovskaya; Jens Ortner; Karsten Pinkwart. 2020. "Studies on Fe/Fe Redox Flow Batteries with Recombination Cell." Journal of The Electrochemical Society 167, no. 16: 160527.
Human health is a key pillar of modern conceptions of sustainability. Humanity pays a considerable price for its dependence on fossil-fueled energy systems, which must be addressed for sustainable urban development. Public hospitals are focal points for communities and have an opportunity to lead the transition to renewable energy. We have reimagined the healthcare energy ecosystem with sustainable technologies to transform hospitals into networked clean energy hubs. In this concept design, hydrogen is used to couple energy with other on-site medical resource demands, and vanadium flow battery technology is used to engage the public with energy systems. This multi-generation system would reduce harmful emissions while providing reliable services, tackling the linked issues of human and environmental health.
Nicholas Gurieff; Donna Green; Ilpo Koskinen; Mathew Lipson; Mark Baldry; Andrew Maddocks; Chris Menictas; Jens Noack; Behdad Moghtaderi; Elham Doroodchi. Healthy Power: Reimagining Hospitals as Sustainable Energy Hubs. Sustainability 2020, 12, 8554 .
AMA StyleNicholas Gurieff, Donna Green, Ilpo Koskinen, Mathew Lipson, Mark Baldry, Andrew Maddocks, Chris Menictas, Jens Noack, Behdad Moghtaderi, Elham Doroodchi. Healthy Power: Reimagining Hospitals as Sustainable Energy Hubs. Sustainability. 2020; 12 (20):8554.
Chicago/Turabian StyleNicholas Gurieff; Donna Green; Ilpo Koskinen; Mathew Lipson; Mark Baldry; Andrew Maddocks; Chris Menictas; Jens Noack; Behdad Moghtaderi; Elham Doroodchi. 2020. "Healthy Power: Reimagining Hospitals as Sustainable Energy Hubs." Sustainability 12, no. 20: 8554.
Nataliya Roznyatovskaya; Jens Noack; Karsten Pinkwart; Jens Tübke. Aspects of electron transfer processes in vanadium redox-flow batteries. Current Opinion in Electrochemistry 2020, 19, 42 -48.
AMA StyleNataliya Roznyatovskaya, Jens Noack, Karsten Pinkwart, Jens Tübke. Aspects of electron transfer processes in vanadium redox-flow batteries. Current Opinion in Electrochemistry. 2020; 19 ():42-48.
Chicago/Turabian StyleNataliya Roznyatovskaya; Jens Noack; Karsten Pinkwart; Jens Tübke. 2020. "Aspects of electron transfer processes in vanadium redox-flow batteries." Current Opinion in Electrochemistry 19, no. : 42-48.
A vanadium oxygen fuel cell is a modified form of a conventional vanadium redox flow battery (VRFB) where the positive electrolyte (VO2+/VO2+ couple) is replaced by the oxygen reduction (ORR) process. This potentially allows for a significant improvement in energy density and has the added benefit of overcoming the solubility limits of V (V) at elevated temperatures, while also allowing the vanadium negative electrolyte concentration to increase above 3 M. In this paper, a vanadium oxygen fuel cell with vanadium electrolytes with a concentration of up to 3.6 M is reported with preliminary results presented for different electrodes over a range of current densities. Using precipitation inhibitors, the concentration of vanadium can be increased considerably above the commonly used 2 M limit, leading to improved energy density.
Mandar Risbud; Chris Menictas; Maria Skyllas-Kazacos; Jens Noack. Vanadium Oxygen Fuel Cell Utilising High Concentration Electrolyte. Batteries 2019, 5, 24 .
AMA StyleMandar Risbud, Chris Menictas, Maria Skyllas-Kazacos, Jens Noack. Vanadium Oxygen Fuel Cell Utilising High Concentration Electrolyte. Batteries. 2019; 5 (1):24.
Chicago/Turabian StyleMandar Risbud; Chris Menictas; Maria Skyllas-Kazacos; Jens Noack. 2019. "Vanadium Oxygen Fuel Cell Utilising High Concentration Electrolyte." Batteries 5, no. 1: 24.
In this study, 1.6 M vanadium electrolytes in the oxidation forms V(III) and V(V) were prepared from V(IV) in sulfuric (4.7 M total sulphate), V(IV) in hydrochloric (6.1 M total chloride) acids, as well as from 1:1 mol mixture of V(III) and V(IV) (denoted as V3.5+) in hydrochloric (7.6 M total chloride) acid. These electrolyte solutions were investigated in terms of performance in vanadium redox flow battery (VRFB). The half-wave potentials of the V(III)/V(II) and V(V)/V(IV) couples, determined by cyclic voltammetry, and the electronic spectra of V(III) and V(IV) electrolyte samples, are discussed to reveal the effect of electrolyte matrix on charge-discharge behavior of a 40 cm2 cell operated with 1.6 M V3.5+ electrolytes in sulfuric and hydrochloric acids. Provided that the total vanadium concentration and the conductivity of electrolytes are comparable for both acids, respective energy efficiencies of 77% and 72–75% were attained at a current density of 50 mA∙cm−2. All electrolytes in the oxidation state V(V) were examined for chemical stability at room temperature and +45 °C by titrimetric determination of the molar ratio V(V):V(IV) and total vanadium concentration.
Nataliya Roznyatovskaya; Jens Noack; Heiko Mild; Matthias Fühl; Peter Fischer; Karsten Pinkwart; Jens Tübke; Maria Skyllas-Kazacos. Vanadium Electrolyte for All-Vanadium Redox-Flow Batteries: The Effect of the Counter Ion. Batteries 2019, 5, 13 .
AMA StyleNataliya Roznyatovskaya, Jens Noack, Heiko Mild, Matthias Fühl, Peter Fischer, Karsten Pinkwart, Jens Tübke, Maria Skyllas-Kazacos. Vanadium Electrolyte for All-Vanadium Redox-Flow Batteries: The Effect of the Counter Ion. Batteries. 2019; 5 (1):13.
Chicago/Turabian StyleNataliya Roznyatovskaya; Jens Noack; Heiko Mild; Matthias Fühl; Peter Fischer; Karsten Pinkwart; Jens Tübke; Maria Skyllas-Kazacos. 2019. "Vanadium Electrolyte for All-Vanadium Redox-Flow Batteries: The Effect of the Counter Ion." Batteries 5, no. 1: 13.
Through targeted and reproducible electrochemical treatment of glassy carbon electrodes, investigations have been carried out on the electrochemical behaviour of the oxidation of V2+, VO2+ and the reductions of VO2+, VO2+ and V3+ in order to pretreat electrodes specifically for use in vanadium redox flow batteries and, if possible, to treat them in situ. For this purpose, a glassy carbon electrode was treated potentiostatically for a period of 30 s at different potentials in the range of 500 mV–2000 mV vs. Hg/Hg2SO4 in 2 M H2SO4 and then linear sweep voltammograms were performed in the different vanadium-containing solutions. With this method, it could be shown that all reactions are extremely surface sensitive and the reaction speeds changed by several decades. The reaction rates increased significantly in all reactions compared to polished electrodes and had an optimum treatment potential of approx. 1600 mV vs. Hg/Hg2SO4, although the oxidation reaction of V2+ and the reduction reactions of V3+ and VO2+ had opposite tendencies to oxidation of VO2+ and the reduction of VO2+ in the area of low treatment potentials. In the former, the kinetics increased and in the latter, they decreased. In addition, causes were investigated using confocal microscopy and XPS. No correlation was found to the roughness or size of the stretched surfaces, although these changed significantly as a result of the treatment. XPS measurements gave indications of a dependence on hydroxyl groups for the oxidation of VO2+ and the reduction of VO2+, while for the reactions of oxygen-free cations and the reduction of VO2+ weak indications of a dependence on carboxyl groups were obtained.
Jens Noack; Nataliya Roznyatovskaya; Jessica Kunzendorf; Maria Skyllas-Kazacos; Chris Menictas; Jens Tübke. The influence of electrochemical treatment on electrode reactions for vanadium redox-flow batteries. Journal of Energy Chemistry 2018, 27, 1341 -1352.
AMA StyleJens Noack, Nataliya Roznyatovskaya, Jessica Kunzendorf, Maria Skyllas-Kazacos, Chris Menictas, Jens Tübke. The influence of electrochemical treatment on electrode reactions for vanadium redox-flow batteries. Journal of Energy Chemistry. 2018; 27 (5):1341-1352.
Chicago/Turabian StyleJens Noack; Nataliya Roznyatovskaya; Jessica Kunzendorf; Maria Skyllas-Kazacos; Chris Menictas; Jens Tübke. 2018. "The influence of electrochemical treatment on electrode reactions for vanadium redox-flow batteries." Journal of Energy Chemistry 27, no. 5: 1341-1352.
Liuyue Cao; Maria Skyllas-Kazacos; Chris Menictas; Jens Noack. A review of electrolyte additives and impurities in vanadium redox flow batteries. Journal of Energy Chemistry 2018, 27, 1269 -1291.
AMA StyleLiuyue Cao, Maria Skyllas-Kazacos, Chris Menictas, Jens Noack. A review of electrolyte additives and impurities in vanadium redox flow batteries. Journal of Energy Chemistry. 2018; 27 (5):1269-1291.
Chicago/Turabian StyleLiuyue Cao; Maria Skyllas-Kazacos; Chris Menictas; Jens Noack. 2018. "A review of electrolyte additives and impurities in vanadium redox flow batteries." Journal of Energy Chemistry 27, no. 5: 1269-1291.
Nataliya V. Roznyatovskaya; Vitaly A. Roznyatovsky; Carl-Christoph Höhne; Matthias Fühl; Tobias Gerber; Michael Küttinger; Jens Noack; Peter Fischer; Karsten Pinkwart; Jens Tübke. The role of phosphate additive in stabilization of sulphuric-acid-based vanadium(V) electrolyte for all-vanadium redox-flow batteries. Journal of Power Sources 2017, 363, 234 -243.
AMA StyleNataliya V. Roznyatovskaya, Vitaly A. Roznyatovsky, Carl-Christoph Höhne, Matthias Fühl, Tobias Gerber, Michael Küttinger, Jens Noack, Peter Fischer, Karsten Pinkwart, Jens Tübke. The role of phosphate additive in stabilization of sulphuric-acid-based vanadium(V) electrolyte for all-vanadium redox-flow batteries. Journal of Power Sources. 2017; 363 ():234-243.
Chicago/Turabian StyleNataliya V. Roznyatovskaya; Vitaly A. Roznyatovsky; Carl-Christoph Höhne; Matthias Fühl; Tobias Gerber; Michael Küttinger; Jens Noack; Peter Fischer; Karsten Pinkwart; Jens Tübke. 2017. "The role of phosphate additive in stabilization of sulphuric-acid-based vanadium(V) electrolyte for all-vanadium redox-flow batteries." Journal of Power Sources 363, no. : 234-243.
Jens Noack; Nataliya Roznyatovskaya; Karsten Pinkwart; Jens Tübke. Vanadium proton exchange membrane water electrolyser. Journal of Power Sources 2017, 349, 144 -151.
AMA StyleJens Noack, Nataliya Roznyatovskaya, Karsten Pinkwart, Jens Tübke. Vanadium proton exchange membrane water electrolyser. Journal of Power Sources. 2017; 349 ():144-151.
Chicago/Turabian StyleJens Noack; Nataliya Roznyatovskaya; Karsten Pinkwart; Jens Tübke. 2017. "Vanadium proton exchange membrane water electrolyser." Journal of Power Sources 349, no. : 144-151.
A vanadium/oxygen fuel cell (VOFC) with a geometrically active area of 51 cm2 and two membranes was discontinuously operated over a period of over 676 h with 47 successive tests at room temperature with a current density of 19.6 mA/cm2 in order to investigate signs of ageing. As well as measuring cell voltages, the test setup was also used to measure anode and redox potentials as well as cell and half-cell impedances. The performance data of the VOFC fluctuated widely over the course of the test period, due to different V2+ concentrations and instabilities of the starting solutions on the one hand and complex changes in cathode conditions on the other. The desired behaviour of the anode reactions was achieved primarily through improved methods for producing the V2+ solutions, and remained stable at the end of the experiments. The kinetics of the cathode reactions were temporarily increased by purging with 2 M H2SO4, however their performance decreased over time. The VOFC had symptoms of ageing by complex and overlaid changes in the cathode’s triple phase boundary layer and in the special conditions between the two electrodes and membranes
Jens Noack; Gwenn Cognard; Meryem Oral; Michael Küttinger; Nataliya Roznyatovskaya; Karsten Pinkwart; Jens Tübke. Study of the long-term operation of a vanadium/oxygen fuel cell. Journal of Power Sources 2016, 326, 137 -145.
AMA StyleJens Noack, Gwenn Cognard, Meryem Oral, Michael Küttinger, Nataliya Roznyatovskaya, Karsten Pinkwart, Jens Tübke. Study of the long-term operation of a vanadium/oxygen fuel cell. Journal of Power Sources. 2016; 326 ():137-145.
Chicago/Turabian StyleJens Noack; Gwenn Cognard; Meryem Oral; Michael Küttinger; Nataliya Roznyatovskaya; Karsten Pinkwart; Jens Tübke. 2016. "Study of the long-term operation of a vanadium/oxygen fuel cell." Journal of Power Sources 326, no. : 137-145.
The electrochemistry of the V(IV)/V(III) redox couple influences the initial pre-charging of the electrolyte in vanadium redox-flow batteries to produce a catholyte and anolyte containing V(V)/V(IV) and V(III)/V(II) couples respectively. The electrochemical conversion of V(III) to V(IV) at a glassy carbon electrode has been studied in detail by cyclic voltammetry in sulfuric acid solutions containing 1.6 M and 0.25 M of V(III) species. A sigmoid-shaped voltammetric response with a half-wave potential at 0.1 V vs. Hg/Hg2SO4 was observed at low scan rates and was attributed to the oxidation of V(III) at an oxidatively pretreated glassy carbon electrode. The attribution of voltammetric responses was consistent with results from a spectroelectrochemical study in 0.25 M vanadium electrolyte solution at a reticulated glassy carbon electrode. Initial pre-charging of V3.5+ electrolyte in vanadium redox-flow batteries is assumed to be accompanied by the generation of V(V) in the catholyte and its chemical reaction with V(III) to form V(IV)
Nataliya Roznyatovskaya; Jens Noack; Matthias Fühl; Karsten Pinkwart; Jens Tübke. Towards an all-vanadium redox-flow battery electrolyte: electrooxidation of V(III) in V(IV)/V(III) redox couple. Electrochimica Acta 2016, 211, 926 -932.
AMA StyleNataliya Roznyatovskaya, Jens Noack, Matthias Fühl, Karsten Pinkwart, Jens Tübke. Towards an all-vanadium redox-flow battery electrolyte: electrooxidation of V(III) in V(IV)/V(III) redox couple. Electrochimica Acta. 2016; 211 ():926-932.
Chicago/Turabian StyleNataliya Roznyatovskaya; Jens Noack; Matthias Fühl; Karsten Pinkwart; Jens Tübke. 2016. "Towards an all-vanadium redox-flow battery electrolyte: electrooxidation of V(III) in V(IV)/V(III) redox couple." Electrochimica Acta 211, no. : 926-932.
A techno-economic model was developed to investigate the influence of components on the system costs of redox flow batteries. Sensitivity analyses were carried out based on an example of a 10 kW/120 kWh vanadium redox flow battery system, and the costs of the individual components were analyzed. Particular consideration was given to the influence of the material costs and resistances of bipolar plates and energy storage media as well as voltages and electric currents. Based on the developed model, it was possible to formulate statements about the targeted optimization of a developed non-commercial vanadium redox flow battery system and general aspects for future developments of redox flow batteries.
Jens Noack; Lars Wietschel; Nataliya Roznyatovskaya; Karsten Pinkwart; Jens Tübke. Techno-Economic Modeling and Analysis of Redox Flow Battery Systems. Energies 2016, 9, 627 .
AMA StyleJens Noack, Lars Wietschel, Nataliya Roznyatovskaya, Karsten Pinkwart, Jens Tübke. Techno-Economic Modeling and Analysis of Redox Flow Battery Systems. Energies. 2016; 9 (8):627.
Chicago/Turabian StyleJens Noack; Lars Wietschel; Nataliya Roznyatovskaya; Karsten Pinkwart; Jens Tübke. 2016. "Techno-Economic Modeling and Analysis of Redox Flow Battery Systems." Energies 9, no. 8: 627.
A vanadium electrolyte for redox-flow batteries (VRFB) with different VIII and VIV mole fractions has been studied by UV-vis spectroscopy. Spectrophotometric detection enables a rough estimate of the VIV and VIII content, which can be used to detect an electrolyte capacity imbalance, i.e. a deviation in the mole fraction of VIV or VIII away from 50%. The isosbestic point at 600 nm can be used as a reference point in the analysis of common VRFB electrolyte batches. The VRFB electrolyte is observed to have an imbalance after prolonged storage (a couple of years) in a tank under ambient conditions. A regeneration procedure, which involves pre-charging the unbalanced electrolyte and mixing part of it with a portion of initial unbalanced electrolyte, has been tested. The resulting rebalanced electrolyte has been compared with a common electrolyte in a charge-discharge cell test and is shown to be suitable for cell operation
Nataliya Roznyatovskaya; Tatjana Herr; Michael Küttinger; Matthias Fühl; Jens Noack; Karsten Pinkwart; Jens Tübke. Detection of capacity imbalance in vanadium electrolyte and its electrochemical regeneration for all-vanadium redox-flow batteries. Journal of Power Sources 2016, 302, 79 -83.
AMA StyleNataliya Roznyatovskaya, Tatjana Herr, Michael Küttinger, Matthias Fühl, Jens Noack, Karsten Pinkwart, Jens Tübke. Detection of capacity imbalance in vanadium electrolyte and its electrochemical regeneration for all-vanadium redox-flow batteries. Journal of Power Sources. 2016; 302 ():79-83.
Chicago/Turabian StyleNataliya Roznyatovskaya; Tatjana Herr; Michael Küttinger; Matthias Fühl; Jens Noack; Karsten Pinkwart; Jens Tübke. 2016. "Detection of capacity imbalance in vanadium electrolyte and its electrochemical regeneration for all-vanadium redox-flow batteries." Journal of Power Sources 302, no. : 79-83.
The feasibility of an alkaline S2O42−/air-fuel cell was evaluated at room temperature, using a cell with an anion exchange membrane and a platinum oxygen reduction reaction catalyst. The tests performed were open circuit voltage analysis, linear sweep voltammetry, discharge analysis and electrochemical impedance spectroscopy (EIS) with registration of anode half-cell potential. With 0.85 M Na2S2O4 in 2 M KOH, the cell achieved a maximum power density of 2 mW cm−2, and the open circuit cell voltage was about 0.9 V. In a potentiostatic discharging at 0.2 V cell voltage, an energy efficiency of 12.3% was achieved at an energy density of 8.6 Wh L−1. The low power density was mainly due to the low reaction kinetics of dithionite oxidation at graphite electrodes. The low energy efficiency was mainly caused by a low cathode potential, which probably resulted from mixed potential formation and the low anode kinetics.
Jens Noack; Jens Tübke; Karsten Pinkwart. Dithionite/air direct ion liquid fuel cell. Journal of Power Sources 2015, 286, 232 -238.
AMA StyleJens Noack, Jens Tübke, Karsten Pinkwart. Dithionite/air direct ion liquid fuel cell. Journal of Power Sources. 2015; 286 ():232-238.
Chicago/Turabian StyleJens Noack; Jens Tübke; Karsten Pinkwart. 2015. "Dithionite/air direct ion liquid fuel cell." Journal of Power Sources 286, no. : 232-238.
Aufgrund der besonderen Eigenschaft der getrennten Skalierbarkeit von Energie und Leistung und der damit verbundenen potenziell niedrigen Energiespeicherkosten haben sich die Entwicklungen von unterschiedlichen Redox-Flow-Batterien zur Speicherung für fluktuierende erneuerbare Energien in den letzten Jahren intensiviert, was zu einem deutlichen Zuwachs an wissenschaftlicher Literatur geführt hat. Aus diesem Grund wird, anhand einer streng systematischen Einteilung und einem Fokus auf die Chemie der Elektrolyte, ein umfassender und kritischer Überblick über die Eigenschaften dieser Batterien und ihr zukünftiges Entwicklungspotenzial gegeben.
Jens Noack; Nataliya Roznyatovskaya; Tatjana Herr; Peter Fischer. Die Chemie der Redox-Flow-Batterien. Angewandte Chemie 2015, 127, 9912 -9947.
AMA StyleJens Noack, Nataliya Roznyatovskaya, Tatjana Herr, Peter Fischer. Die Chemie der Redox-Flow-Batterien. Angewandte Chemie. 2015; 127 (34):9912-9947.
Chicago/Turabian StyleJens Noack; Nataliya Roznyatovskaya; Tatjana Herr; Peter Fischer. 2015. "Die Chemie der Redox-Flow-Batterien." Angewandte Chemie 127, no. 34: 9912-9947.
The development of various redox-flow batteries for the storage of fluctuating renewable energy has intensified in recent years because of their peculiar ability to be scaled separately in terms of energy and power, and therefore potentially to reduce the costs of energy storage. This has resulted in a considerable increase in the number of publications on redox-flow batteries. This was a motivation to present a comprehensive and critical overview of the features of this type of batteries, focusing mainly on the chemistry of electrolytes and introducing a thorough systematic classification to reveal their potential for future development
Jens Noack; Nataliya Roznyatovskaya; Tatjana Herr; Peter Fischer. The Chemistry of Redox-Flow Batteries. Angewandte Chemie International Edition 2015, 54, 9776 -9809.
AMA StyleJens Noack, Nataliya Roznyatovskaya, Tatjana Herr, Peter Fischer. The Chemistry of Redox-Flow Batteries. Angewandte Chemie International Edition. 2015; 54 (34):9776-9809.
Chicago/Turabian StyleJens Noack; Nataliya Roznyatovskaya; Tatjana Herr; Peter Fischer. 2015. "The Chemistry of Redox-Flow Batteries." Angewandte Chemie International Edition 54, no. 34: 9776-9809.
A stationary two-dimensional model for the vanadium oxygen fuel cell is developed. The model consists of a single cell with two membranes, set up as of two half-cells and an intermediate chamber. The transport and balance of mass, momentum and charge are linked to the electrochemical reaction kinetics of the vanadium species and oxygen. The kinetic model for the cathode half-cell is extended by an empirical logistic function to describe the transient behavior of the half-cell. Additionally, experiments are conducted on a single vanadium oxygen fuel cell with 40 cm(2) active membrane area. The experimental results are used to validate the simulation data. The effects of constant current discharging, polarization behavior and different flow rates on the cathode overpotential are studied by means of this model
F.T. Wandschneider; M. Küttinger; Jens Noack; Peter Fischer; K. Pinkwart; J. Tübke; H. Nirschl. A coupled-physics model for the vanadium oxygen fuel cell. Journal of Power Sources 2014, 259, 125 -137.
AMA StyleF.T. Wandschneider, M. Küttinger, Jens Noack, Peter Fischer, K. Pinkwart, J. Tübke, H. Nirschl. A coupled-physics model for the vanadium oxygen fuel cell. Journal of Power Sources. 2014; 259 ():125-137.
Chicago/Turabian StyleF.T. Wandschneider; M. Küttinger; Jens Noack; Peter Fischer; K. Pinkwart; J. Tübke; H. Nirschl. 2014. "A coupled-physics model for the vanadium oxygen fuel cell." Journal of Power Sources 259, no. : 125-137.
A vanadium/oxygen fuel cell with an active area of 280 cm2 has been developed. The cell consisted of two membranes with two half-cells and an intermediate chamber. The maximum achieved power density was 23 mW cm -2 at 0.56 V with lambda air = 3 and a 1.6 M V2+ solution at room temperature. The average discharge power density was 19.6 mW cm -2 at a constant current density of 40 mA cm-2 with an average voltage efficiency of 33%. The fuel based energy density was 18.2% of the theoretical value with 11.8 Wh L-1. In comparison with a similarly constructed 50 cm2 cell, both achieved similar performance levels. An analysis using the half-cell potential profiles and by means of impedance spectroscopy revealed that, as for the 50 cm2 cell, the low rate of oxygen reduction reaction significantly affected the performance of the cell. Thus gives potential for the optimization of the cathode reaction and a reduction in the ohmic resistances potential for higher power densities
Jens Noack; Carsten Cremers; Domnik Bayer; Jens Tübke; Karsten Pinkwart. Development and characterization of a 280 cm2 vanadium/oxygen fuel cell. Journal of Power Sources 2014, 253, 397 -403.
AMA StyleJens Noack, Carsten Cremers, Domnik Bayer, Jens Tübke, Karsten Pinkwart. Development and characterization of a 280 cm2 vanadium/oxygen fuel cell. Journal of Power Sources. 2014; 253 ():397-403.
Chicago/Turabian StyleJens Noack; Carsten Cremers; Domnik Bayer; Jens Tübke; Karsten Pinkwart. 2014. "Development and characterization of a 280 cm2 vanadium/oxygen fuel cell." Journal of Power Sources 253, no. : 397-403.