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 (EN) technique has been preliminarily attempted to study AB5-type hydrogen storage alloy MlNi3.75Co0.65Mn0.4Al0.2 with various depth of discharge (DOD). The results show that the EN of the alloy in the steady state is much more obvious than that of the alloy just after charging/discharging process, and the EN at elevated temperature is much stronger than that at room temperature. PSD (Power Spectral Density) curves of EN for the alloy with various DOD are composed of white noise at low frequency and flick noise (1/fα noise) at high frequency, though their EN are seriously different. Dependence of the slope α and that of the power P on DOD of the alloy are contrary to each other.
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