Modification of MgH2 hydrogen storage performance by nickel-based composite catalyst Ni/NiO
Wenxuan Li, Xinglin Yang, Quanhui Hou, Xiaohui Lu, Jie Kong, Jianye Su
Abstract
In this study, the Ni/NiO catalyst was demonstrated to enhance the hydrogen storage performance of MgH 2 . The dehydrogenation of MgH 2 +10wt% Ni/NiO started at approximately 180°C, achieving 5.83 wt% of dehydrogenation within 10 minutes at 300°C. Completely dehydrogenated, MgH 2 began to rehydrogenate at about 50°C, absorbing about 4.56 wt% of hydrogen in 10 minutes at 150°C. In addition, the activation energies of dehydrogenation and rehydrogenation of MgH 2 +10wt% Ni/NiO were 87.21 and 34.84 kJ/mol. During the dehydrogenation/rehydrogenation cycle, Mg 2 Ni/Mg 2 NiH 4 could promote hydrogen diffusion, thus enhancing the hydrogen storage performance of Mg/MgH 2 .
Topics & Concepts
DehydrogenationNon-blocking I/OHydrogen storageCatalysisNickelHydrogenMaterials scienceComposite numberChemical engineeringDiffusionInorganic chemistryChemistryMetallurgyOrganic chemistryComposite materialPhysicsThermodynamicsEngineeringHydrogen Storage and MaterialsHybrid Renewable Energy SystemsAmmonia Synthesis and Nitrogen Reduction