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This paper analyses the efficiency of hydrogen production by alkaline electrolysis under increased pressure. The production of hydrogen under pressure should reduce the energy required for post-compression and thus increase the overall efficiency. This could help to reduce the cost of green hydrogen, which is currently 4.5 times more expensive than hydrogen produced by steam reforming. An alkaline electrolyser test rig has been developed to produce hydrogen under increased pressure. A special feature here is the use of standard components and 3D-printed parts, as well as the absence of a membrane. The overall efficiency is measured based on the electrical energy consumed and the amount of hydrogen produced up to a pressure of 15 bar. The ratio of the electrical energy required to produce hydrogen is compared at different pressures, and the pressure-dependent curve of the overall efficiency is shown.

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Analysis of the Electrolysis Efficiency of a Membrane-less Alkaline High-Pressure Electrolyser as a Function of the Electrolysis Pressure

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  • 发表日期：

    2026年

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  • Matthias Eigenstetter,
  • Otto Kreutzer

摘要

This paper analyses the efficiency of hydrogen production by alkaline electrolysis under increased pressure. The production of hydrogen under pressure should reduce the energy required for post-compression and thus increase the overall efficiency. This could help to reduce the cost of green hydrogen, which is currently 4.5 times more expensive than hydrogen produced by steam reforming. An alkaline electrolyser test rig has been developed to produce hydrogen under increased pressure. A special feature here is the use of standard components and 3D-printed parts, as well as the absence of a membrane. The overall efficiency is measured based on the electrical energy consumed and the amount of hydrogen produced up to a pressure of 15 bar. The ratio of the electrical energy required to produce hydrogen is compared at different pressures, and the pressure-dependent curve of the overall efficiency is shown.