(求助):关于Koutecky-Levich 公式的具体解释及如何计算？
近来看文献，其中有一段关于表征氧还原催化剂Pt活性的一段描述，不大理解，请教各位虫友，原文如下:
the specific activities (activity per unit area of catalyst surface, which is usually represented by the kinetic current density, jk) of these particles toward the oxygen reduction reaction (ORR) performed in O2-saturated sulfuric acid solution. The values of jk were obtained from the steady-state polarization curves according to the Koutecky-Levich equation：
jk=（j*jL）/(jL-j) (1）
in eq 1.j is the measuring current density at various potentials on the steady -state polarization curve,and jL is the limiting diffusion current density. The surface area of the catalyst particle used to caculate the current densities were obtained from the charge invovlved in the hysdrogen adsorption /desorption current peak in Cyclic Voltammetry.
上面这段话对公式的解释完全正确吗?
我想问：计算电流密度时，用的面积是旋转圆盘的几何面积还是Pt的电化学活性面积，另外，公式中的极限电流密度是通过计算得出来的呢?还是通过稳态极化曲线读出来的?
如果是读出来的,测试ORR时，扩散的那段看起来是平的，但是上面的数值还是有一些差别，主要是小数点后第三四位，所以想请教一下大家，这个极限电流怎么读啊？
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没有人知道吗?
我昨天帮你发了email去问作者，还没给我回复的
据说在电镀的时候由于真实面积容易变化，所以还是用表观面积来替代
但是确实也有真实电流密度这种说法
J is the current density normalized by electrochemical surface area
That limitation current is OK, roughly is fine. For the Levich plot, you need the value for certain potential.
请问你说的是这种图吗
，
Yes. In the case of specific activity, the current density is after normalization by electrochemical surface area. In your picture, the diffusion limit range should be on the left side.