Study on the hydrogen storage property of (TiZr0.1)(x)Cr1.7-yFeyMn0.3 (1.05
Study on the hydrogen storage property of (TiZr0.1)(x)Cr1.7-yFeyMn0.3 (1.05
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(TiZr0.1)(x)Cr1.7-yFeyMn0.3(1.05)储氢性能研究
DOI：
10.1016/j.pnsc.2018.07.006
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Li Xingguo
中科院分区：
文献类型：
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作者：
Li Jigang;Xu Li;Jiang Xiaojing;Li Xingguo
用X射线衍射仪、压力-成分-温度等方法研究了用Ar等离子弧熔炼制备的(TiZr0.1)xCr1.7-yFeyMn0.3(1.05 <；x <； 1.2，(0.2 <；y <； )合金的储氢性能。结果表明，所有(TiZr0.1)xCr1.7-yFeyMn0.3(1.05 ≤x ≤ 1.2，0.2 ≤y ≤ 0.6)合金均为C14型Laves相，晶胞参数a、c和晶胞体积随(TiZr)超化学计量比从1.05增加到1.2而增大，a/c值基本不变。(TiZr0.1)xCr1.1Fe0.6Mn0.3(1.05 ≤x ≤ 1.2)在274 K下，随着(TiZr)超化学计量比从1.0 5增加到1.2，吸氢和放氢平台压力分别从5.6、4.4~2.6、2.2 Mpa下降，当(TiZr)超化学计量比超过1.15时，放氢平台压力下降不明显。(TiZr0.1)1.1Cr1.1Fe0.6Mn0.3合金综合性能最好，最大储氢量和可逆储氢量分别为1.79wt%和1.45wt% 。(TiZr0.1)1.1Cr1.7-yFeyMn0.3(0.2 ≤y ≤ 0.6)合金的晶胞参数a、c和晶胞体积随Fe/Cr含量的降低而增大。在2 74 K下，当Fe含量从0.6降至0.2 时，加氢平台压力和脱氢平台压力分别从4.5、3.4~1.0、0.9 Mpa降低到1.79~2.0 wt%，当Fe/Cr比为0.13时，(TiZr0.1)1.1Cr1.5Fe0.2 Mn0.3合金的最大储氢量和可逆储氢量分别为2.0和1.6 5 wt%，其相对分解氢的摩尔热为2 4.30 kJ/molH2。
The hydrogen storage of (TiZr0.1)xCr1.7-yFeyMn0.3(1.05 <x < 1.2, 0.2 <y < 0.6) alloys, prepared by Ar plasma arc melting, were investigated by X-ray diffraction, pressure-composition- temperature (PCT). The results indicated that all (TiZr0.1)xCr1.7-yFeyMn0.3(1.05 ≤x ≤ 1.2, 0.2 ≤y ≤ 0.6) alloys were determined as C14-type Laves phase, the cell parameters a, c and unit cell volume of (TiZr0.1)xCr1.1Fe0.6Mn0.3(1.05 ≤x ≤ 1.2) alloys increased with increasing the (TiZr) super-stoichiometry from 1.05 to 1.2, and the value of a/c almost unchanged. The hydrogen absorption and desorption plateau pressure decreased from 5.6, 4.4–2.6, 2.2 MPa with the increase of (TiZr) super-stoichiometry from 1.05 to1.2 at 274 K respectively, and the hydrogen desorption plateau pressure decline was not obvious when the (TiZr) super-stoichiometry exceeded 1.15. The (TiZr0.1)1.1Cr1.1Fe0.6Mn0.3alloy had the best comprehensive properties about the maximum and reversible hydrogen storage capacity was 1.79 and 1.45 wt% respectively. The cell parameters a, c and unit cell volume of (TiZr0.1)1.1Cr1.7-yFeyMn0.3(0.2 ≤y ≤ 0.6) alloys increased as the ratio of Fe/Cr content decreased. The hydrogenation and dehydrogenation plateau pressure decreased from 4.5, 3.4–1.0, 0.9 MPa respectively and the maximum hydrogen storage capacity increased from 1.79 to 2.0 wt% as the Fe content reduced from 0.6 to 0.2 at 274 K. The maximum and the reversible hydrogen storage capacity were about 2.0 and 1.65 wt% as the ratio of Fe/Cr was 0.13 (ie, (TiZr0.1)1.1Cr1.5Fe0.2Mn0.3alloy), its relative molar enthalpy of dissociation hydrogen was 24.30 kJ/mol H2.