Effect of exchange current density and charge transfer coefficient on performance characteristics of voltage of alkaline electrolysis

Nur Nadhirah Syafiqa Binti Mohammad Musa and Alhassan Salami Tijani

Applied Energy, 2025, vol. 394, issue C, No S030626192500916X

Abstract: Alkaline electrolysis is an emerging future technology that is very important for developing sustainable renewable energy systems such as hydrogen refuel filling stations and fuel cell (FC) vehicles. Many operating parameters such as exchange current density and charge transfer coefficient (CTC) contribute to the current voltage characteristics of alkaline electrolysis. This research aims to investigate the effect of operating parameters on the performance of alkaline electrolysis. In comparison with the cathode characteristics, it was observed that at exchange current density of 3.15×10−7A/cm2, the activation overvoltage was found to be 0.39 V, whereas at exchange current density of 1×10−3A/cm2, the activation overvoltage was observed to be 0.24 V, which corresponds to about a 38 % reduction in activation overvoltage for the cathode electrode. The most interesting observation of the findings is that the results of CTC produced at the anode electrode are higher than the cathode electrode at the same exchange current density.

Keywords: Charge transfer coefficient; MATLAB simulation; Mathematical model; Alkaline electrolyzer (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.apenergy.2025.126186

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