Abstract
The research aims to study the effect of adding mischmetal (Mm) to the TiFe0.86Mn0.07Co0.07 alloy on its hydrogen storage performance and cyclic stability. The results show that TiFe0.86Mn0.07Co0.07 + x% Mm (x = 0,4,6,8) alloys can be easily activated. The hydrogen absorption capacity of TiFe0.86Mn0.07Co0.07 + 4% Mm reaches 1.76 wt% (mass fraction) at 298 K. With the increase of Mm addition, the hydrogen storage capacity decreases slightly. Furthermore, after 40 absorption and desorption cycles in hydrogen containing 250 ppm O2, the alloy still has 36% of its initial hydrogen storage capacity, and the alloy can recover 93% of its hydrogen storage capacity through heat treatment.
Highlights
Energy is a global major issue in the 21st century
The TiFe-based hydrogen storage alloy has the advantages of low cost, large hydrogen storage capacity, and easy preparation, and is currently a commonly used hydrogen storage material
Facts have proved that rare-earth metals can significantly improve the cyclic stability under impure hydrogen gas of V-based hydrogen storage alloys
Summary
Energy is a global major issue in the 21st century. Hydrogen is an efficient, cheap, safe, and sustainable new energy vector, and it plays an important role in the human energy strategy. A problem that has not been solved yet is that the TiFe-based alloy has poor cyclic stability under impure hydrogen gas. La in LaNi5 and La-Mg-N on the absorption and desorption properties of hydrogen in mixed hydrogen gas They found that La plays an important role in the cyclic stability of the alloys. Studied the effect of adding rare-earth metals on the cyclic stability of V-Fe-Cr-Ti alloy in impure hydrogen gas. Facts have proved that rare-earth metals can significantly improve the cyclic stability under impure hydrogen gas of V-based hydrogen storage alloys. We hope that the addition of rare-earth elements (43% La, 56% Ce, 1% Pr, and Nd is easy to buy in the market, we call this metal mixture mischmetal) can improve the cyclic stability properties of the alloy and maintain its excellent hydrogen absorption and desorption properties
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