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Updated: Sep 18, 2025
Preparation of Binary and Ternary Deep Eutectic Systems
Published on: October 31, 2019
Deep Eutectic Solvents Formed by Complex Hydrides: A New Class of Hydrogen-Rich Liquid
Loris Lombardo1,2,3, Taichi Nishiguchi3, Thi Ha My Pham1,2
1Institute of Chemical Sciences and Engineering, Basic Science Faculty, École polytechnique fédérale de Lausanne (EPFL) Valais/Wallis, Energypolis, Rue de l'Industrie 17, Sion, 1951, Switzerland.
Researchers developed new hydrogen-rich liquids using deep eutectic solvents (DESs) by combining tetrabutylammonium borohydride and ammonia borane. These stable, liquid mixtures offer a promising avenue for efficient hydrogen storage applications.
Area of Science:
- Materials Science
- Chemistry
- Chemical Engineering
Background:
- Deep eutectic solvents (DESs) are mixtures with significantly depressed melting points.
- Hydrogen storage is crucial for clean energy technologies.
- Complex hydrides are investigated for their hydrogen-rich properties.
Purpose of the Study:
- To synthesize novel hydrogen-rich liquids using DES technology.
- To investigate the properties and hydrogen release capabilities of these new materials.
- To explore their potential for hydrogen storage applications.
Main Methods:
- Combining tetrabutylammonium borohydride (TBABH) and ammonia borane (AB) to form DESs.
- Characterizing the resulting liquid mixtures, including glass transition temperature and hydrogen content.
- Investigating hydrogen release behavior at elevated temperatures.
Main Results:
- Stable, hydrogen-rich liquids were formed with glass transition temperatures as low as -50 °C.
- Mixtures containing up to 6.9 wt% hydrogen were achieved through physical grinding.
- Hydrogen release was observed at temperatures as low as 60 °C.
Conclusions:
- The study presents the first example of a hydride-based DES.
- These novel hydrogen-rich liquids show significant promise for safe and efficient hydrogen storage.
- This research advances the field of complex hydrides and opens new possibilities for hydrogen-rich liquid applications.
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