What is meant by "charge transfer resistance"?

Charge transfer resistance refers specifically to the resistance encountered at the interface between the electrode and the electrolyte during electron transfer reactions. It is a critical factor in electrochemical processes, as it directly influences the rate at which electrons are transferred between the electrode and the electroactive species in the solution. A high charge transfer resistance may indicate slower reaction kinetics, which can adversely affect the performance of electrochemical systems, such as batteries and fuel cells.

In electrochemical measurements, understanding charge transfer resistance allows researchers to optimize conditions for reactions and to evaluate the efficiency of electrodes. This concept is important in various applications ranging from sensors to energy storage devices, highlighting its relevance in both fundamental and applied electrochemistry.