Abstract
The core-shell Ni3N@N-doped carbon (Ni3N@NC) was synthesized by a facile sol-gel and heat-treatment process. The as-synthesized core-shell Ni3N@NC consisted of an approximately 16 nm Ni3N core and a 2 nm N-doped carbon shell. The MgH2-xwt%Ni3N@NC (x = 3, 5, 10 and 15) composites were prepared by ball-milling method. The hydrogen storage properties of the composites were investigated using isothermal dehydrogenation apparatus and temperature-programmed desorption system. It was found that the MgH2-5wt%Ni3N@NC composites exhibited the optimal hydrogen storage performance among all the composites. The onset desorption temperature of MgH2-5wt%Ni3N@NC composites decreased to 175 °C compared to 335 °C for the pure MgH2. Moreover, the MgH2-5wt%Ni3N@NC composites released 6.0 wt% H2 (only 0.2 wt% H2 for the pure MgH2) within 20 min at 325 °C. The hydrogen desorption of MgH2-5wt%Ni3N@NC composites was controlled by a two-dimensional nucleation and growth mechanism.
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