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<p>Ti–Cr–Mo BCC-type alloys are one of the most promising materials for hydrogen storage, offering high capacity and cost competitive ability. However, the tardy dehydrogenation kinetics of metal hydride is a common and challenging issue in practical application. Thereinto, hydride decomposition reaction and hydrogen diffusion through the alloy's bulk are two main factors influencing the dynamic performance. In this study, a Ni-doping strategy was employed based on these two aspects. Experimental results show that the Ni-doped alloy, compared to the original alloy, exhibits a lower enthalpy change for the hydride decomposition reaction (22.61&#xa0;kJ/mol H<sub>2</sub> vs. 36.42&#xa0;kJ/mol H<sub>2</sub>) and requires less activation energy for hydrogen desorption (11.64&#xa0;kJ/mol vs. 31.43&#xa0;kJ/mol), thereby enhancing the thermodynamics of hydrogen release. Moreover, Ni-doping leads to the formation of secondary phases within the BCC matrix due to its relatively low solubility in the Ti–Cr–Mo BCC-type phase. These secondary phases create phase boundaries that offer additional diffusion pathways for hydrogen, thereby accelerating the hydrogen diffusion process. Ni-doping also significantly increases the hydrogen desorption plateau pressure of the alloy, and the resulting higher hydrogen concentration gradient between the interior and exterior of the alloy further enhances the hydrogen diffusion rate. In conclusion, Ni-doping improves the hydrogen desorption performance of Ti–Cr–Mo alloys by accelerating both the chemical reaction and hydrogen diffusion rate.</p>

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Improved dynamic performance of Ni-doped Ti–Cr–Mo BCC alloys for hydrogen storage at ambient temperature

  • 期刊论文

  • 发表日期：

    2025年8月9日

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  • Yumeng Zhao,
  • Hongmei Cai,
  • Yaying Cao,
  • Yakun Zhang,
  • Dazhe Xu,
  • Hao Wang,
  • Bo Cheng,
  • Yunfei Xue

摘要

Ti–Cr–Mo BCC-type alloys are one of the most promising materials for hydrogen storage, offering high capacity and cost competitive ability. However, the tardy dehydrogenation kinetics of metal hydride is a common and challenging issue in practical application. Thereinto, hydride decomposition reaction and hydrogen diffusion through the alloy's bulk are two main factors influencing the dynamic performance. In this study, a Ni-doping strategy was employed based on these two aspects. Experimental results show that the Ni-doped alloy, compared to the original alloy, exhibits a lower enthalpy change for the hydride decomposition reaction (22.61 kJ/mol H2 vs. 36.42 kJ/mol H2) and requires less activation energy for hydrogen desorption (11.64 kJ/mol vs. 31.43 kJ/mol), thereby enhancing the thermodynamics of hydrogen release. Moreover, Ni-doping leads to the formation of secondary phases within the BCC matrix due to its relatively low solubility in the Ti–Cr–Mo BCC-type phase. These secondary phases create phase boundaries that offer additional diffusion pathways for hydrogen, thereby accelerating the hydrogen diffusion process. Ni-doping also significantly increases the hydrogen desorption plateau pressure of the alloy, and the resulting higher hydrogen concentration gradient between the interior and exterior of the alloy further enhances the hydrogen diffusion rate. In conclusion, Ni-doping improves the hydrogen desorption performance of Ti–Cr–Mo alloys by accelerating both the chemical reaction and hydrogen diffusion rate.