Hydrogen storage properties of Ti-Fe-Zr-Mn-Nb alloys

TiFe alloy is one of the prime candidates for stationary hydrogen storage applications. However, the practical applications of TiFe alloy are limited by harsh requirements of activation. Alloying is an effective approach for improving the hydrogen storage properties of TiFe alloys. In this paper, we...

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Bibliographic Details
Published in:Journal of alloys and compounds 2023-03, Vol.938, p.168466, Article 168466
Main Authors: Liu, Huang, Zhang, Jingxi, Zhou, Chengshang, Sun, Pei, Liu, Yong, Fang, Zhigang Zak
Format: Article
Language:English
Subjects:
Activation
Hydrogen storage
Metal hydrides
Multi-component
TiFe alloys
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Summary:TiFe alloy is one of the prime candidates for stationary hydrogen storage applications. However, the practical applications of TiFe alloy are limited by harsh requirements of activation. Alloying is an effective approach for improving the hydrogen storage properties of TiFe alloys. In this paper, we investigate the effect of Nb alloying on the microstructure and hydrogen storage properties of Ti-Fe-Zr-Mn-Nbx (x = 0, 2, 4, 8 at%) alloys. In particular, we found that 2 at% of Nb addition to the alloy enables a good combination of the hydrogen capacity and the activation property, and the Zr-rich phases play a critical role in the activation behavior of Ti-Fe-Zr-Mn-Nbx alloy by absorbing hydrogen before the hydrogenation of the TiFe matrix. However, high Nb addition (>4 at%) leads to the reduction of the Zr-rich phases and thus deteriorates the activation kinetics. Moreover, the Nb addition also favors the formation of the TiFe main phase and promotes higher capacities at ambient temperature. It is also demonstrated that the Nb addition lowers the first plateau pressure and decreases the hysteresis of the isotherms. These correlations between the microstructure and hydrogen storage performance provide insights into tailoring hydrogen storage properties by alloying TiFe with multi-elements. [Display omitted] •2 at% of Nb addition of alloys combines good capacity and activation properties.•Zr-rich phase promotes activation by absorbing hydrogen prior to the TiFe matrix.•High content of Nb deteriorates activation kinetics of TiFe alloys.•TiFe phase is favored by Nb addition and improves hydrogen storage capacity.•Nb addition lowers plateau pressures and decreases hydrogen sorption hysteresis.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.168466