Electrochemical reactivity of magnesium hydride toward lithium: New synthesis route of nano-particles suitable for hydrogen storage

Electrochemical conversion reaction of MgH₂ with Li ion enables the production of in-situ nanometric Mg and MgH₂ particles so-called (nano-Mg) _INSITU and (nano-MgH₂)_INSITU] showing interesting hydrogen sorption properties with hydrogen absorption at 100 °C under 10 bars of hydrogen pressure (PH₂) and desorption at 200 °C under primary vacuum, respectively. Differential Scanning Calorimetry (DSC) measurements of MgH₂ electrochemically prepared confirmed a decrease in the desorption temperature from 416 °C to 295 °C and in the heat of formation from −74 kJ mole mol⁻¹ (H₂)⁻¹ to −56 kJ mol⁻¹ (H₂)⁻¹ for commercial (particle size diameter: 10 μm–100 μm) and as prepared MgH₂ hydride (particle size: 10 nm–40 nm), respectively.