Co对MlNi_(4.3-x)Co_xAl_(0.7)贮氢电极动力学性能的影响

Influence of Co content on kinetic properties of MlNi 4.3-x Co x Al 0.7 hydrogen storage alloys

详细研究了Ｃｏ 对ＭｌＮｉ４ ．３ － ｘＣｏｘＡｌ０ ．７（ ｘ ＝ ０ ， ０ ．３ ， ０ ．５ ，０ ．７ ，０ ．９ ，１ ．１ ，１ ．３） 贮氢电极的动力学特性的影响； 研究的动力学参数包括高倍率放电特性ＨＲＤ、交换电流密度Ｊ０ 、极限电流密度ＪＬ、对称因子β以及氢在α相中的扩散系数Ｄα。实验结果表明： 随着ＭｌＮｉ４ ．３ － ｘＣｏｘＡｌ０ ．７ 贮氢电极中Ｃｏ 含量的增大， 合金的高倍率放电能力迅速减小， 交换电流密度Ｊ０ ， 极限电流密度ＪＬ，

The effects of Co content on the kinetic properties, including high rate dischargeability HRD, exchange current density J 0 , limiting current density J L, the symmetry factor β , and the diffusion coefficient of hydrogen in the α phase D α , of MlNi 4.3-x Co x Al 0.7 ( x =0, 0.3, 0.5, 0.7, 0.9, 1.1, and 1.3) hydride electrodes, have been studied systematically. The results show that with increasing Co content in MlNi 4.3-x Xo x Al 0.7 hydride electrodes, the HRD, J 0 , J L, β and D α decrease markedly.