Alkaline electrolysis for green hydrogen production: A novel, simple model for thermo-electrochemical coupled system analysis

Lingkang Jin*, Rafael Nogueira Nakashima, Gabriele Comodi, Henrik Lund Frandsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Alkaline water electrolysis (AWE) is the most mature electrochemical technology for hydrogen production from renewable electricity. Thus, its mathematical modeling is an important tool to provide new perspectives for the design and optimization of energy storage and decarbonization systems. However, current models rely on numerous empirical parameters and neglect variations of temperature and concentration alongside the electrolysis cell, which can impact the application and reliability of the simulation results. Thus, this study proposes a simple four-parameter semi-empirical model for AWE system analysis, which relies on minimal fitting data, while providing reliable extrapolation results. In addition, the effect of model dimensionality (i.e., 0D, 1/2D and 1D) are carefully assessed in the optimization of an AWE system. The results indicate that the proposed model can accurately reproduce literature data from four previous works (R2 ≥ 0.98), as well as new experimental data. In the system optimization, the trade-offs existing in the lye cooling sizing highlight that maintaining a low temperature difference in AWE stacks (76-80°C) leads to higher efficiencies and lower hydrogen costs.
Original languageEnglish
Article number125154
JournalApplied Thermal Engineering
Volume262
Number of pages15
ISSN1359-4311
DOIs
Publication statusPublished - 2025

Keywords

  • Power-to-Hydrogen
  • Alkaline electrolysis
  • Temperature control
  • Levelized cost of hydrogen
  • Hydrogen production

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