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微电极具备一些常规尺寸电极所没有的优点,例如:(1)半径很小的微电极在不对溶液进行搅拌的情况下就具备与高速旋转的圆盘电极类似的性质,即在电位扫描速率较低时,可获得稳态伏安曲线.这一特点使微电极能方便地用于稳态测量.与暂态测量相比,稳态测量精度较高(实验曲线几乎不受充电电流干扰),实验方法较简单,实验结果的数学处理较容易.(2)微电极体系的时间常数(溶液电阻和双层电容的乘积)正比于电极面积的平方根.若在
Microelectrodes have some advantages that conventional electrode sizes do not have. For example: (1) Microelectrodes of very small radius have similar properties to high speed rotating disk electrodes without agitation of the solution, ie, Steady-state voltammetry can be obtained when the temperature is low, which makes the microelectrode easy to use for steady-state measurement. Compared with the transient measurement, the steady-state measurement accuracy is high (the experimental curve is hardly disturbed by the charging current) The experimental method is simpler and the experimental results are easier to deal with in mathematics. (2) The time constant of microelectrode system (product of solution resistance and double layer capacitance) is proportional to the square root of electrode area.