TY - GEN A1 - Sakkas, Nikolaos P. A1 - Gillung, Frank A1 - Thummar, Krunalkumar A1 - Abang, Roger A1 - Röntzsch, Lars T1 - Advanced pressurized alkaline water electrolysis at high temperatures up to 130 °C T2 - International journal of hydrogen energy N2 - Operating alkaline water electrolysers above 100 °C improves electrolyte conductivity and reaction kinetics significantly. To examine alkaline water electrolysis in this area in more detail a high-temperature pressurized test rig is designed and constructed. Nickel (Ni) foam electrodes coated with Raney nickel (Raney Ni) or nickel manganese (NiMn) and expanded Ni mesh electrodes coated with nickel(II) oxide (NiO) are utilized and the effect of electrolyte flow rate, electrode structure, pressure and temperature variation on the cell performance at temperatures up to 130 °C and pressures up to 16 bar are investigated. At the maximum current density of 1.67 A/cm2, 110 °C and 16 bar the electrode combination of Raney Ni coated Ni foam as cathode and NiO coated expanded Ni mesh electrode as anode attain the best outcome with a cell voltage of 2.29 V. In a 70 h duration test three-dimensional (3D) Ni foam electrodes with Raney Ni cathode and NiMn anode catalyst show a moderate cell degradation of 9.26 μV/h. KW - Hydrogen production KW - Alkaline water electrolysis KW - 3D electrodes KW - High temperature operation KW - Pressurized operation Y1 - 2025 U6 - https://doi.org/10.1016/j.ijhydene.2025.150075 SN - 0360-3199 VL - 149 SP - 1 EP - 12 PB - Elsevier BV CY - Amsterdam ER -