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Green hydrogen (GH2) has been considered a promising alternative to fossil fuels in chemical and energy applications. In this study, a comparative analysis is performed for the life cycle of GH2 production, through pressurized Alkaline electrolysis (ALE), sourced with different renewable energy options in Portugal, especially hydropower, PV solar, and wind energy. GWP impact is assessed using SimaPro software concerning the construction materials and operation requirements for the hydrogen production project with 15 MW capacity and 20 years lifetime. Four electricity supply technology scenarios for the electrolyzer system are investigated, namely, hydropower, wind turbine, PV solar, and the electricity grid mix in Portugal. LCA results demonstrated that hydrogen from the hydropower scenario has the lowest GWP impact of 0.26 kg CO2eq /kgH2, followed by 1.76 for the wind turbine scenario, followed by 2.94 for the PV solar scenario, and 7.4 kg CO2eq /kgH2 for the grid mix scenario. The GWP values obtained are lower than the common conventional steam methane reforming method (11.89 kg CO2eq /kgH2).

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Comparative Life Cycle Analysis of Electrolysis Hydrogen Production from Diverse Green Energy Sources

  • 章节

  • 发表日期：

    2025年

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  • Wagd Ajeeb,
  • Rui Costa Neto,
  • Patrícia Baptista

摘要

Green hydrogen (GH2) has been considered a promising alternative to fossil fuels in chemical and energy applications. In this study, a comparative analysis is performed for the life cycle of GH2 production, through pressurized Alkaline electrolysis (ALE), sourced with different renewable energy options in Portugal, especially hydropower, PV solar, and wind energy. GWP impact is assessed using SimaPro software concerning the construction materials and operation requirements for the hydrogen production project with 15 MW capacity and 20 years lifetime. Four electricity supply technology scenarios for the electrolyzer system are investigated, namely, hydropower, wind turbine, PV solar, and the electricity grid mix in Portugal. LCA results demonstrated that hydrogen from the hydropower scenario has the lowest GWP impact of 0.26 kg CO2eq /kgH2, followed by 1.76 for the wind turbine scenario, followed by 2.94 for the PV solar scenario, and 7.4 kg CO2eq /kgH2 for the grid mix scenario. The GWP values obtained are lower than the common conventional steam methane reforming method (11.89 kg CO2eq /kgH2).