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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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  11. Trifluoroacetamide Additive-driven Solvation Structure Regulation And Interfacial Adsorption For Wide-temperature Hydrogen-evolution-suppressed Aqueous Magnesium-air Batteries

Trifluoroacetamide additive-driven solvation structure regulation and interfacial adsorption for wide-temperature hydrogen-evolution-suppressed aqueous magnesium-air batteries

Sha Jianchun1, Wang Qiang1, Li Xue1

  • 1Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China; Engineering Research Center of Advanced Materials Preparing Technology, Ministry of Education, Northeastern University, Shenyang 110819, China.

Journal of Colloid and Interface Science
|June 14, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Trifluoroacetamide (TFA) enhances aqueous magnesium-air batteries by suppressing corrosion and hydrogen evolution. This additive improves battery lifespan and voltage, enabling stable operation across a wide temperature range for sustainable energy storage.

Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Aqueous magnesium-air batteries (AMABs) offer sustainable energy storage potential.
  • Uncontrolled magnesium (Mg) corrosion leads to hydrogen evolution and the chunk effect, limiting AMAB performance.
  • Developing effective strategies to mitigate Mg corrosion is crucial for advancing AMAB technology.

Purpose of the Study:

  • To introduce trifluoroacetamide (TFA) as a multifunctional electrolyte additive for AMABs.
  • To investigate the dual solvation-interfacial regulation mechanism of TFA in AMABs.
  • To enhance the stability, efficiency, and lifespan of Mg anodes in AMABs.

Main Methods:

  • Theoretical and experimental analyses of TFA's effect on Mg corrosion and solvation.
  • Electrochemical testing of Mg anodes and Mg-air batteries with TFA-containing electrolytes.
Keywords:
Aqueous magnesium-air batteriesDischarge propertiesElectrolyte additive

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  • Characterization of the solid-electrolyte interphase (SEI) formed on the Mg surface.

    • Main Results:

    • TFA reconstructs the Mg2+ solvation sheath, reducing free water activity and weakening hydrogen-bond networks.
    • TFA forms a protective SEI on the Mg surface, suppressing hydrogen evolution reaction (HER) by 57% and promoting planar Mg stripping.
    • Optimized TFA electrolyte (0.2 M) achieved 70.6% Mg anode utilization, extended battery lifespan to 145.61 h (2.3x improvement), and enabled a high discharge voltage of 1.84 V.
    • The TFA-modified battery demonstrated excellent performance at -20°C and 50°C, with a power density of 2271.19 mWh·g-1 at 10 mA·cm-2.

    Conclusions:

    • TFA effectively suppresses Mg corrosion and hydrogen evolution in AMABs through dual regulation.
    • TFA significantly enhances Mg anode utilization, battery lifespan, and operating voltage.
    • The developed electrolyte additive demonstrates exceptional wide-temperature adaptability, paving the way for durable and high-performance multivalent metal-air batteries.