Doublelayersarecharacteristicofallphaseboundaries1V ,1nm,thefieldstrength(gradientofpotential)isenormous-itisoftheorder107V/cm.The effect of this enormous field at the electrode-electrolyte interface is, in a sense, the essence of electrochemistry!Helmholtz 内层(IHP, inner Helmholtz plane)和 Helmholtz 外层(OHP， outer Helmholtz plane)从此图可得到一个具体的双电层大小的概念：双电层中的紧密层厚度大约是3A ，分散层约8A ，整个双电层约11A或稍大于11A 。这虽是汞/ 溶液界面情况其它电极的双电层尺寸也大致如此。Chapter Four Fundamentals of Kinetics and Mechanism of Electrode Reactions1. In
