Hydrogen production by electrolysis - .NET Framework

Hydrogen production by electrolysis Ann Cornell, Department of Chemical Engineering, KTH.. Sources for Hydrogen International Energy Agency. Technology Roadmap . Hydrogen and Fuel Cells, 2015. electrolysis 4%. Coal electrolysis 18% 22%. Natural gas Natural gas 48% 37%. Coal Oil refineries 33%. 30%. Biomass 8%. Today Prediction year 2050. electrolysis for H2- production Only large scale alternative for fossil-free production Expensive method Pure gases produced Water electrolysis : Acidic conditions Alkaline conditions Anode H2O O2 + 2H+ + 2e- 2OH- O2 + 2H2O + 2e- Cathode 2H+ + 2e- H2 2H2O + 2e- H2 + 2OH- Total reaction: H2O H2 + O2. Commercial techniques water electrolysis SPE (Solid Alkaline water polymer Technology electrolysis electrolyte). electrolysis Aqueous Process Reversed PEFC . electrolysis Feed 80% KOH, 80oC Pure H2O, 80oC. Charge carriers OH- H+. Well developed High current densities Industrial use Large scale Differential pressure Expensive catalysts Alkaline water electrolysis 2OH- O2 + 2H2O + 2e- 2H2O + 2e- H2 + 2OH- Alkaline water electrolyser Anode: 4OH- O2 + 2H2O + 4e- Cathode: 4H2O + 4e- 2H2 + 4OH- Electrolyte: 25% KOH 80oC.

• Hydrogen an important energy carrier in a future fossile free society • Only large scale production alternative today produced without emission of greenhouse gases is electrolysis • Oxygen produced often not used – other useful anodic products in aqueous based electrolytic processes, for example chlor-alkali

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  Hydrogen, Electrolysis

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