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nature : Any two different phase will be in contact with two white have potential, which is caused by the charge separation. Phase two have excess charge, the equivalent of electricity, plus or minus, the contrary, the phase attractive form of a double layer. In the metal electrode - electrolyte interface of the two potential exists, the same will have a double-layer, the total thickness of about 0.2-20 nm. The metal electrode is the good conductor, surplus concentrated in the surface charge; The electrolyte resistivity larger surplus of close to charge only part of the interface, saying close (dual) layer (compact double layer); The remaining parts were scattered state, said the spread (double) layer (double diffuse layer; Translation error "diffusion layer"). The core of the electrode reaction steps -- more sudden transfer (ie activation steps) need to close the layer, the impact of electrode reaction adsorption process also occurs in electric double layer, the electric double layer structure of the theory for the electrochemical production and will have important significance.
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