Effects of highly dispersed Ni nanoparticles on the hydrogen storage performance of MgH₂

Abstract

MgH₂ with a large hydrogen capacity is regarded as a promising hydrogen storage material. However, it still suffers from high thermal stability and sluggish kinetics. In this paper, highly dispersed nano-Ni has been successfully prepared by using the polyol reduction method with an average size of 2.14 nm, which significantly improves the de/rehydrogenation properties of MgH₂. The MgH₂—10wt% nano-Ni sample starts releasing H₂ at 497 K, and roughly 6.2wt% H₂ has been liberated at 583 K. The rehydrogenation kinetics of the sample are also greatly improved, and the adsorption capacity reaches 5.3wt% H₂ in 1000 s at 482 K and under 3 MPa hydrogen pressure. Moreover, the activation energies of de/rehydrogenation of the MgH₂—10wt% nano-Ni sample are reduced to (88 ± 2) and (87 ± 1) kJ·mol⁻¹, respectively. In addition, the thermal stability of the MgH₂—10wt% nano-Ni system is reduced by 5.5 kJ per mol H₂ from that of pristine MgH₂. This finding indicates that nano-Ni significantly improves both the thermodynamic and kinetic performances of the de/rehydrogenation of MgH₂, serving as a bi-functional additive of both reagent and catalyst.

Keywords

Ni nanoparticle / kinetics / thermodynamics / MgH₂ / hydrogen storage performance

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