Balancing Nanostructuring and Stability: How Ball-Milling Energy and Graphite Addition Control Hydrogen Storage and Air Resistance in MgH 2

Solid-state hydrogen storage in magnesium hydride (MgH2) is limited by slow sorption kinetics, high desorption temperatures, and strong sensitivity to air exposure. Here, we systematically investigate how ball-milling energy, modulated through milling time, rotation speed, ball size, and graphite addition affect the microstructure, hydrogen storage performance, and oxidation resistance of MgH2-based materials. High-energy milling (300 rpm, 10 mm balls) promotes extensive crystallite refinement and large increases in surface area, not only resulting in the fast hydrogen uptake but also in strong susceptibility to air-driven degradation. Conversely, milder milling conditions (150 rpm, 3 mm balls) combined with…

• CD
  Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

  Award: OOxOma614
• CN
  Conselho Nacional de Desenvolvimento Científico e Tecnológico
• FC
  Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico