Ni添加对Ti_(0.47)V_(0.28)Mn_(0.15)Cr_(0.1)储氢合金电化学性能的影响

EFFECT OF Ni ADDITION ON ELECTROCHEMICAL PROPERTIES OF Ti_(0.47)V_(0.28) Mn_(0.15)Cr_(0.1) ALLOY

通过X射线衍射谱(XRD)、气态吸放氢行为(PCT曲线)、电化学充放电性能、电化学阻抗谱(EIS),考察了Ni添加对Ti_(0.47)V_(0.28)Mn_(0.15)Cr_(0.1)储氢合金的电化学性能的影响。结果表明:Ti_(0.47)V_(0.28)Mn_(0.15)Cr_(0.1)的电化学活性很差,在碱液中几乎不能放电,添加Ni之后得到了明显改善。随着Ni含量的增加,Ti_(0.47)V_(0.28)Mn_(0.15)Cr_(0.1)Ni_x(x=0～0.25)合金电极的放电容量先增大后减小,在x=0.15时达到最大值310mA·h·g^(-1)。

Results of X-ray diffraction (XRD), pressure-composition-temperature (PCT) curves, discharge curves, electrochemical impedance spectra (EIS) show that the discharge performance of Ti_(0.47) V_(0.28) Mn_(0.15) Cr_(0.1) alloy electrode is very poor because of low electrochemical activity, which could be greatly improved by Ni addition. With increase of Ni content, the discharge capacity of Ti_(0.47) V_(0.28) Mn_(0.15) Cr_(0.1) Ni_x (x=0—0.25) alloy electrodes increases first and then decreases. When x=0. 15, ...