Charge transfer resistance has to do with the process of electron transfer from one phase (e.g. electrode) to another (e.g. liquid). Take, for example, the electrolysis of water. On the cathode hydrogen is reduced to H2 gas.
It takes energy to remove electrons from a metal electrode and join them with the protons to produce hydrogen. Thus, the process of transferring electrons from the electrode to the hydrogen ions in the liquid phase has a certain resistance associated with it and this resistance can be given in ohms just like regular ohmic resistance. That resistance is charge transfer resistance.
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