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Corrosion-Resistant Amino Acid-Based Deep Eutectic Solvents toward Liquid Desiccant Air Conditioning Systems

  • 1.

    Renewable Energy Research Group, Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China

  • 2.

    School of Advanced Energy, Sun Yat-Sen University, Shenzhen 510275, China

    • Fund Project: The work described in this paper was supported by grants from the General Research Fund project of the Hong Kong Research Grant Council (Ref. No.: 15208024).
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Energy Use  1(1),  https://doi.org/10.59717/ipj.energy-use.2025.100004  |  Cite this article
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    1. Deep eutectic solvents (DESs) offer low-corrosion alternatives to traditional liquid desiccants.

      L-Arginine as HBA enhances robust hydrogen bond networks; HBD ratio and water content influence properties.

      Density, viscosity, and surface tension decrease with higher HBD ratio and water content, except for PG series.

      Vapor pressure drops with increasing HBD ratio but rises with higher water content in DESs.

      DESs show significantly lower corrosion rates than LiBr, with rates as low as 0.001 mm/year on metals.

    • ABSTRACT
  • Liquid desiccant air-conditioning systems (LDAS) represent a promising energy-efficient technology with considerable potential for reducing overall energy consumption. However, conventional liquid desiccants are hindered by their pronounced corrosivity toward metallic components, which compromises system durability and increases maintenance costs. To address this limitation, the present study explores deep eutectic solvents (DESs) as novel, low-corrosion alternatives for use as liquid desiccants. A comprehensive investigation was conducted to elucidate the effects of hydrogen bond acceptor (HBA) type, water content, and hydrogen bond donor (HBD) ratio on the physicochemical properties of DESs, utilizing both experimental and theoretical approaches. The findings indicate that L-Arginine serves as a particularly effective HBA, promoting the formation of robust hydrogen bond networks within the DES matrix. In general, density, viscosity, and surface tension decreased with increasing HBD ratio and water content, although the surface tension of the Proline-Glycerol (PG) series exhibited an exception to this trend. Concerning vapor pressure, DESs demonstrated a reduction as the HBD ratio increased, but an elevation with higher water content. Importantly, the corrosion rates of the DESs evaluated in this study were significantly lower than those of lithium bromide (LiBr) solution, with values as low as 0.001 mm/year observed on metallic substrates.
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  • Cite this article:

    Li Z., Luo J. and Yang H. (2025). Corrosion-Resistant Amino Acid-Based Deep Eutectic Solvents toward Liquid Desiccant Air Conditioning Systems. Energy Use 1:100004. https://doi.org/10.59717/ipj.energy-use.2025.100004
    Li Z., Luo J. and Yang H. (2025). Corrosion-Resistant Amino Acid-Based Deep Eutectic Solvents toward Liquid Desiccant Air Conditioning Systems. Energy Use 1:100004. https://doi.org/10.59717/ipj.energy-use.2025.100004

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