储能科学与技术2025，Vol.14Issue(10)：3666-3676,11.DOI:10.19799/j.cnki.2095-4239.2025.0427
(Ti0.9Zr0.1)1.1Mn1.2-xCr0.8Gax合金的储氢性能研究
Study on the hydrogen storage properties of(Ti0.9Zr0.1)1.1Mn1.2-xCr0.8Gax alloys
摘要
Abstract
Gallium(Ga),as a liquid metal with negative mixing enthalpies with multiple elements,can form high-entropy alloys(HEAs)with various metals under mild conditions.In this study,Ga was introduced into C14 Laves phase HEAs.(Ti0.9Zr0.1)1.1Mn1.2-xCr0.8Gax alloys(x=0,0.1,0.2)alloys were fabricated using vacuum induction melting technology.Through a combination of theoretical calculations and experimental tests,the effects of the Ga substitution for Mn on the microstructure and hydrogen storage properties were systematically investigated.Theoretical calculations revealed that Ga doping reduced the atomic size difference from 7.54 to 7.39 and lowered the mixing enthalpy to-9.17 kJ/mol,thereby improving the phase stability.The valence electron concentration analysis suggested an efficient hydrogen absorption/desorption performance at ambient temperature.The experimental results demonstrated that all alloys exhibited single-phase C14 Laves structures with a homogeneous elemental distribution.Ga substitution for Mn increased the unit cell volume from 165.52 Å3 to 167.25 Å3,significantly reducing the hydrogen absorption/desorption plateau pressures and hysteresis factors while improving the kinetic performance.The time required to reach 90%of the maximum hydrogen capacity was shortened to less than 50 s.Among the tested alloys,(Ti0.9Zr0.1)1.1Mn1.1Cr0.8Ga0.1 displayed the optimal hydrogen storage properties,achieving a maximum capacity of 1.81%(weight fraction)with absorption/desorption plateau pressures of 0.9 MPa and 0.86 MPa at 293 K,respectively.This alloy retained 96%of its initial capacity after 30 cycles while maintaining a single C14 Laves phase,demonstrating exceptional cycling stability.This study clarifies the mechanistic role of Ga in high-entropy hydrogen storage alloys and provides theoretical guidance for Ga applications in hydrogen storage materials.关键词
镓/储氢合金/储氢性能/C14 Laves相Key words
gallium/hydrogen storage alloy/hydrogen storage properties/C14 Laves phase分类
能源科技引用本文复制引用
杨斌,张勉恒,赵长颖,龙霞..(Ti0.9Zr0.1)1.1Mn1.2-xCr0.8Gax合金的储氢性能研究[J].储能科学与技术,2025,14(10):3666-3676,11.基金项目
国家重点研发项目(2023YFB4005400). （2023YFB4005400）
