Ω*cm2是Area Specific Impedance(ASI，面积比阻抗)的单位，是相乘的关系 ASI=阻抗×面积=R×S 1 摘抄概念一 这是一份测试手册中的定义 Area-Specific Impedance (ASI) – The impedance of a device relative to the electrode area of the device, defined as the change in cell voltage  (V) as a result of a change in cell current divided by the change in cell current (A),  all multiplied by the active superficial cell area(cm2), ohm-cm2. 2 摘抄概念二 燃料电池中定义，但是相通的，可以辅助理解 Area Specific Resistance is also material quantity, as it is dependent on a sample's dimensions. This quantity, when expressed in units of mΩ*cm2, can be multiplied by the current density in A/cm2 to get mV. When referring to Area Specific Resistance we must be clear as to what is causing the resistance. While the measured Area Specific Resistance is dominated by the membrane in an optimized fuel cell, it is possible to have an Area Specific Resistance much higher than the membrane's Area Specific Resistance in a fuel cell that is not yet optimized. This is the result of the resistance introduced by other fuel cell components and interfaces. Area Specific Resistance is calculated by multiplying the Area times the Resistance: R * A = L / σ 3 小兵分析 为什么要采用ASI？个人理解是为了更好对比电极的阻抗性质。 例如，有两个组成一样的电极(也就是具有相同的ASI)，但面积不一样，一个是1cm2 (电阻为1 Ω)，一个是2 cm2 (电阻为0.5 Ω )。 根据ASI=阻抗×面积=R×S，我们可以发现 第一个电极，ASI=R×S=1 Ω×1cm2=1 Ω*cm2 第二个电极，ASI=R×S=2 Ω×0.5cm2=1 Ω*cm2 两个电极的ASI是一样的，因此，可以更好地对比电极的阻抗大小。在实验当中，我们采用不同的电极尺寸(面积不一样)进行测试，也能用ASI直接比较和分析。 上述电极的ASI是1 Ω*cm2，我们还可以反推，用了10 cm2的电极，那么可大概推算出，其阻抗约为0.1 Ω。 理解并应用ASI，会使得我们在电极材料研究、电极制作和电池设计中，有很大帮助的。 4 关于阻抗单位 文献中有用Ω，  Ω*cm2， Ω*g，这些都是没问题的，关键看实验的目的和习惯。 为了表述清楚，写得有点长，不当之处，望批评指正。 希望小兵的回帖对大家的理解有所帮助，