Unraveling the degradation mechanism for the hydrogen storage property of Fe nanocatalyst-modified MgH2

Abstract

Maintaining fast hydrogen storage kinetics is a key challenge for the practical application of MgH₂. To address this challenge, understanding the mechanism of kinetics that declines during cycling is crucial but it has not been systematically investigated to date. In this paper, three different Fe nanocatalysts were synthesized and then doped into MgH₂ to form new composites. The MgH₂-Fe composite had significantly reduced operating temperatures and activation energy compared to that of undoped MgH₂. During cycling, a capacity retention of 93.4% was obtained after the 20^th cycle. For a better understanding of the declining performance, prolonged incubation was intentionally performed. Grain growth was found in MgH₂ and the Fe nanocatalysts, which was directly responsible for capacity loss and kinetic degradation. These findings provide fundamental insights to facilitate designing and preparing catalytic hydrogen storage systems with superior cycling performance.