Abstract
BackgroundThe synergistic catalysis has a good improvement on the hydrogen storage properties of MgH2. MethodsIn this work, fibrous spherical NiMoO4 bimetallic catalysts were prepared by hydrothermal and sintering methods, and introduced into the MgH2 system by ball milling to improve their kinetic performance. In addition, rGO (reduced graphene oxide) was also introduced to improve the cycling stability of MgH2. Significant findingsIt is observed that NiMoO4 has a significant improvement in the kinetics of MgH2 absorption and dehydrogenation. MgH2 + 10 wt% NiMoO4 can start dehydrogenation at 191 °C. After complete dehydrogenation, it starts to absorb hydrogen below 50 °C. The apparent activation energy of dehydrogenation and hydrogen absorption of MgH2 + 10 wt% NiMoO4 composites were reduced by 35.43 kJ mol−1 and 30.10 kJ mol−1, respectively, compared with pure MgH2. The results of characterization indicated that the uniformly dispersed NiMoO4 produced Mg2Ni and elemental Mo in situ after the first hydrogen release reaction. It is believed that the synergistic effect of Mo and Ni elements accelerates the hydrogen absorption and desorption performance of hydrogen storage materials. Cycling performance tests showed that the addition of rGO improved the cycling stability of the hydrogen storage material.
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