• Document: PEM Water Electrolysis - Present Status of Research and Development
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PEM Water Electrolysis - Present Status of Research and Development Review Lecture – Session HP.3d Tom Smolinka Fraunhofer-Institut für Solare Energiesysteme ISE 18th World Hydrogen Energy Conference 2010 Essen, May 18, 2010 © Fraunhofer ISE Agenda „ Background of PEM water electrolysis activities at Fraunhofer ISE „ Fundamental of PEM water electrolysis „ Electrodes and Membrane Electrode Assembly „ Cell design and stack construction „ System layout and efficiencies „ Comparison to alkaline water electrolyser (Conclusion and summary) 2 © Fraunhofer ISE The Self-sufficient Solar House in Freiburg … „ … begin of R&D activities in PEM electrolysis at Fraunhofer ISE „ First developments in the eighties „ Field test: 1992-1995 „ Complete hydrogen storage system consisting of: „ PEM electrolyser (30 bar / 2 kWel) „ H2 and O2 pressure tanks „ PEM fuel cell 3 © Fraunhofer ISE The Self-sufficient Solar House in Freiburg … PV Electrolyser Battery Fuel DC Load Regenerative fuel cell: panel Cell „ PEM electrolysis unit Electrical usage (30 bar / 2 kWel) Inverter AC load „ H2/O2 storage tanks „ PEM fuel cell „ No mech. compressor! Warm water Electricity Gas Storage Thermal usage tanks Heat Cooking Heating 4 © Fraunhofer ISE For more than 20 years experience in PEM electrolysis „ Material characterisation „ Cell and stack design „ Balance of plant „ Control strategies „ Power electronics „ Integration with RES „ System evaluation 5 © Fraunhofer ISE Schematic of a PEM electrolysis cell membrane cathode anode current distributor flow field plate electrode (electrocatalysts) 6 © Fraunhofer ISE Schematic of a PEM electrolysis cell H2 0.5 O2 Anode reaction: cathode anode H2O → 0.5 O2 + 2H+ +2e- H+ Cathode reaction: 2H+ + 2e- → H2 Total reaction: H 2O H2O → H2 + 0.5 O2 „ Vrev = 1.23 V @ STP „ endothermal reaction 7 © Fraunhofer ISE Decomposition of water 300 1.56 2.0 Free Energy of Reaction [kJ mol ] -1 275 1.43 Enthalpy of Reaction [kJ mol ] ΔHR ~ Vth -1 1.8 Theoretical Cell Voltage [V] 250 1.30 η Cath Cell

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