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Improved hydrogen release from LiB0.33N0.67H2.67 with noble metal additions
Frederick E Pinkerton1, Martin S Meyer, Gregory P Meisner
1Materials and Processes Laboratory, General Motors Research and Development Center, MC 480-106-224, 30500 Mound Road, Warren, MI 48090-9055, USA. frederick.e.pinkerton@gm.com
Noble metal catalysts like palladium and platinum significantly lower the temperature required for hydrogen release from LiBH4-based materials. This advancement also reduces ammonia release, improving hydrogen storage potential.
Area of Science:
- Materials Science
- Chemical Engineering
- Hydrogen Storage
Background:
- LiBH4-based complex hydrides are promising for hydrogen storage.
- Their practical application is limited by high dehydrogenation temperatures and ammonia co-release.
Purpose of the Study:
- To improve the hydrogen release kinetics of LiBH4-based materials.
- To investigate the effect of noble metal additives on dehydrogenation properties.
Main Methods:
- Addition of palladium (Pd) and platinum (Pt) catalysts (e.g., Pd nanoparticles, PdCl2, Pt nanoparticles on Vulcan carbon).
- Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) to study hydrogen release.
- Gas chromatography to quantify released gases (H2, NH3).
Main Results:
- Pd and Pt additives significantly reduced the hydrogen release midpoint temperature (T1/2) by up to 90°C.
- Ammonia release was suppressed, especially below 210°C.
- Pt/Vulcan carbon showed superior catalytic activity.
- Partial hydrogen uptake was achieved at modest temperatures.
Conclusions:
- Noble metal catalysts effectively enhance hydrogen release from LiBH4-based materials.
- Catalyst addition improves the hydrogen storage performance by lowering operating temperatures and reducing byproducts.
- Further research is needed to elucidate the catalytic mechanism.
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