V-Fe二元合金的吸放氢特性

Hydrogen Storage Properties of V-Fe Binary Alloys

Fe的添加,提高了金属钒的活化性能和放氢平台压力,降低吸放氢容量。Fe含量<1%(原子分数,下同),对二氢化物并无明显影响,Fe含量>1%,二氢化物平台压明显升高,容量明显下降,氢化物的生成焓明显降低;Fe的添加对一氢化物并无明显的影响。随着Fe含量的增加,合金的晶格常数和晶胞体积呈线性趋势降低。

The effects of Fe on the activation performance, kinetic property, the hydrogen capacities and stabilities of β phase hydride and y phase hydride of vanadium metal were investigated. The activation performance and plateau pressure of vanadium are improved by the addition of Fe, while the absorption and desorption capacities are declined. When Fe addition is lower than 1 at%, it has little influence on the properties of di-hydride. When Fe addition is 〉1 at%, the plateau pressure of di-hydride increases, the absorption and desorption capacities and hydride formation enthalpy of di-hydride decrease obviously. However, the addition of Fe has little influence on the properties of monohydride of vanadium. The lattice parameter and lattice volume of vanadium decline in a linear way with the increase of Fe addition.