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将电化学噪音技术应用于AB5型贮氢合金的研究,初步探索了其放电深度与电化学噪音(EN)信号之间的关系。结果表明,贮氢合金MlNi3.75Co0.65Mn0.4Al0.2在稳定状态的电化学噪音信号比充放电刚结束时要明显得多,而且在高温下的电化学噪音信号比室温下明显得多。虽然不同放电深度的该合金电极EN信号有明显的区别,但其功率密度谱(PSD)曲线均由低频区的白噪音和高频区的闪烁噪音组成。随着放电深度的增加,PSD曲线中闪烁噪音的斜率α和噪音功率P的变化规律正好相反,α先减小后增大,P先增大后减小。
Electrochemical noise technology is applied to the study of AB5 type hydrogen storage alloy, and the relationship between the depth of discharge and the signal of electrochemical noise (EN) has been tentatively explored. The results show that the electrochemical noise signal of hydrogen storage alloy MlNi3.75Co0.65Mn0.4Al0.2 at steady state is much more obvious than that at the end of charging and discharging, and the electrochemical noise signal at high temperature is much more than that at room temperature. Although the EN signals of the alloy electrode at different depths of discharge are obviously different, the power density spectrum (PSD) curve consists of white noise in low frequency region and flicker noise in high frequency region. As the depth of discharge increases, the variation law of the slope α and the noise power P of the flickering noise in the PSD curve is just the opposite. Α decreases first and then increases, P increases first and then decreases.