Institute of pressurized alkaline electrolyser with high ... · Zirfon layer. Hydrogen from...
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Wissen für Morgen Knowledge for Tomorrow New system concept for alkaline electrolyser using “E-bypass separator” with internal electrolyte channel. + Less gas impurities at low current and high pressure + Better wetting of electrodes at high current E-bypass separator with internal electrolyte channel: “E-bypass separator” diaphragms with internal electrolyte bypass and properties for maximum benefit of the cell were developed with a total thickness (including the internal electrolyte channel) between 1.4 and 3.4 mm at the size of a 300 cm 2 electrolyser. Electrode coatings using Vacuum Plasma Spraying were demonstrated reducing the overpotential of a nickel electrode by 210 mV for the cathode and 150 mV for the anode thus increasing the efficiency. NiAlMo coating of cathode increases the stability during on-off- operation. Pore size analysis of VPS-coated and activated NiAlMo electrode. 3D SEM measurements are planned to see the evolution of pore size distribution in long term electrolyser operation. 300 cm 2 single cell realising the e-bypass separator concept. Test station with single cell integrated. Variation of flow in internal electrolyte channel is tested investigating the effect on gas impurities and current-voltage curve. The project RESelyser develops high pressure, highly efficient, low cost alkaline water electrolysers that can be integrated with renewable energy power sources (RES) using an advan- ced membrane concept, highly effi- cient electrodes and a new cell de- sign. A new separator membrane with internal electrolyte circulation and an adapted design of the cell to improve mass transfer, especially gas evacu- ation is investigated and demonstra- ted. Intermittent and varying load operation with RES is addressed by improved electrode stability and a cell concept for increasing the gas purity of hydrogen and oxygen especially at part load operation. Also the system architecture is optimized for inter- mittent operation of the electrolyser. It could be demonstrated that elec- trodes with a plasma sprayed coating layer give an overpotential reduction of 360 mV compared to uncoated electrodes thus showing high perfor- mance and stability. A double layer diaphragm with internal KOH supply is expected to improve the gas purity and high current density performance of the cell. The e-bypass separator concept of internal layer electrolyte supply could be realised and tested in a 300 cm 2 single cell electrolyser. The research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7/2007- 2013) for the Fuel Cells and Hydrogen Joint Technology Initiative under grant agreement n° [278732] 10. www.reselyser.eu 2.4 mm 30% KOH Zirfon layer 0.6 mm CATHODE ANODE Zirfon layer Hydrogen from Regenerative Energy Power Sources: pressurized alkaline electrolyser with high efficiency and wide operating range (“RESelyser”) R. Reissner 1 , G. Schiller 1 , E. Guelzow 1 , Y. Alvarez Gallego 2 , W. Doyen 2 , A. Funke 3 , P. Fawcus 3 , J. Vaes 3 , J.R. Bowen 4 1 Deutsches Zentrum fuer Luft- und Raumfahrt, Institut fuer Technische Thermodynamik, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany, e-mail: regine.reissner @ dlr.de; 2 VITO , Belgium; 3 Hydrogenics Europe, Belgium; 4 DTU Energy Conversion Supported by: 210 mV
Transcript of Institute of pressurized alkaline electrolyser with high ... · Zirfon layer. Hydrogen from...
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Wissen für Morgen Knowledge for Tomorrow
Institute of Technical Thermodynamics
New system concept for alkaline electrolyser using “E-bypass separator” with internal electrolyte channel. + Less gas impurities at low current and high pressure + Better wetting of electrodes at high current E-bypass separator with internal electrolyte channel: “E-bypass separator” diaphragms with internal electrolyte bypass and properties for maximum benefit of the cell were developed with a total thickness (including the internal electrolyte channel) between 1.4 and 3.4 mm at the size of a 300 cm2 electrolyser. Electrode coatings using Vacuum Plasma Spraying were demonstrated reducing the overpotential of a nickel electrode by 210 mV for the cathode and 150 mV for the anode thus increasing the efficiency. NiAlMo coating of cathode increases the stability during on-off-operation.
Pore size analysis of VPS-coated and activated NiAlMo electrode. 3D SEM measurements are planned to see the evolution of pore size distribution in long term electrolyser operation. 300 cm2 single cell realising the e-bypass separator concept. Test station with single cell integrated. Variation of flow in internal electrolyte channel is tested investigating the effect on gas impurities and current-voltage curve.
N Brennstoffzellen zur Onboard- Stromversorgung in Luftfahrzeugen Hier folgen die Namen der Autoren Maximal 3 Zeilen
The project RESelyser develops high pressure, highly efficient, low cost alkaline water electrolysers that can be integrated with renewable energy power sources (RES) using an advan-ced membrane concept, highly effi-cient electrodes and a new cell de-sign. A new separator membrane with internal electrolyte circulation and an adapted design of the cell to improve mass transfer, especially gas evacu-ation is investigated and demonstra-ted. Intermittent and varying load operation with RES is addressed by improved electrode stability and a cell concept for increasing the gas purity of hydrogen and oxygen especially at part load operation. Also the system architecture is optimized for inter-mittent operation of the electrolyser. It could be demonstrated that elec-trodes with a plasma sprayed coating layer give an overpotential reduction of 360 mV compared to uncoated electrodes thus showing high perfor-mance and stability. A double layer diaphragm with internal KOH supply is expected to improve the gas purity and high current density performance of the cell. The e-bypass separator concept of internal layer electrolyte supply could be realised and tested in a 300 cm2 single cell electrolyser. The research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7/2007-2013) for the Fuel Cells and Hydrogen Joint Technology Initiative under grant agreement n° [278732] 10. www.reselyser.eu
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Hydrogen from Regenerative Energy Power Sources: pressurized alkaline electrolyser with high efficiency and wide operating range (“RESelyser”) R. Reissner1, G. Schiller1, E. Guelzow1, Y. Alvarez Gallego2, W. Doyen2, A. Funke3, P. Fawcus3, J. Vaes3 , J.R. Bowen 4 1Deutsches Zentrum fuer Luft- und Raumfahrt, Institut fuer Technische Thermodynamik, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany, e-mail: regine.reissner @ dlr.de; 2VITO , Belgium; 3Hydrogenics Europe, Belgium; 4DTU Energy Conversion
Supported by:
210 mV
Hydrogen from Regenerative Energy Power Sources: pressurized alkaline electrolyser with high efficiency and wide operating range (“RESelyser”)�R. Reissner1, G. Schiller1, E. Guelzow1, Y. Alvarez Gallego2, W. Doyen2, A. Funke3,�P. Fawcus3, J. Vaes3 , J.R. Bowen 4�1Deutsches Zentrum fuer Luft- und Raumfahrt, Institut fuer Technische Thermodynamik, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany, e-mail: regine.reissner @ dlr.de; 2VITO , Belgium; 3Hydrogenics Europe, Belgium; 4DTU Energy Conversion���
