Serial electrochemical hydrogen compressor stack for high-pressure compression

Chanho Chu, Minsoo Kim, Youngki Kim, Sihyung Park, Taeyoung Beom, Sangwon Kim and Dong Kyu Kim

Applied Energy, 2025, vol. 383, issue C, No S0306261925001278

Abstract: In this study, a serial electrochemical hydrogen compressor (EHC) stack was designed to compress hydrogen gas to hundreds of bars. The operating parameters were examined to analyze optimal performance. First, a serial stack was designed to enable the EHC to operate at pressures exceeding hundreds of bars. The circular design of the stack was chosen specifically to prevent hydrogen leakage. A 127-μm-thick membrane was selected owing to its relatively good pressure resistance and performance. Through a serial EHC stack of 3 cells, hydrogen was pressurized over 120 bar. A parametric study showed that the pressure-ratio across the membrane barely affected the performance. Additionally, the higher the temperature and relative humidity, the better the performance. By increasing the temperature to 70 °C, the power consumption was reduced by 40 %. At 100 % relative humidity, the EHC exhibited the lowest power consumption. Finally, the performance of the serial stack was analyzed under optimal operating conditions, wherein it demonstrated an efficiency over 64 % for below 0.03 kg/day mass-flow rate of compressed hydrogen. However, efficiency decreased to 12 % at a mass-flow rate over 0.17 kg/day.

Keywords: Hydrogen; High-pressure compression; Electrochemical compressor; Stack design; Electro-osmotic drag (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.apenergy.2025.125397

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