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通过循环伏安法和计时安培法对1163K温度下钾与石墨在KF熔盐中的插层反应动力学进行研究。循环伏安研究结果表明钾与石墨在KF熔盐中的插层/脱嵌反应包括动力学因素。用可逆及准可逆理论对计时安培曲线进行分析,进一步确认钾插入石墨层间这一过程是由钾离子在石墨中的扩散和相变动力学共同控制的。用准可逆动力学方程对电流-时间瞬态曲线进行非线性拟合,求得插层反应的传递系数为0.364。通过扫描电镜对发生钾插层反应后的石墨表面进行分析,发现石墨基体被严重腐蚀。
The kinetics of intercalation reaction between K and molten graphite in KF molten salt at 1163K was investigated by cyclic voltammetry and chronoamperometry. Cyclic voltammetry studies have shown that potassium / graphite intercalation / de-intercalation reactions in KF molten salts include kinetic factors. The reversible and quasi-reversible theory is used to analyze the chronoamperometry curve. It is further confirmed that potassium intercalation between graphite layers is controlled by the diffusion and phase-change kinetics of potassium ions in graphite. Using the quasi-reversible kinetic equation to nonlinearly fit the current-time transient curve, the transfer coefficient of the intercalation reaction was found to be 0.364. Scanning electron microscopy of potassium intercalation reaction after the graphite surface was analyzed and found that the graphite matrix was severely corroded.