Electrochemical oxygen reduction, kinetic aspects

Kinetic and Mechanistic Aspects of Electrochemical Oxygen Reduction... 

The reaction has been subject of numerous experimental and theoretical studies mechanistic aspects based on theoretical considerations are described and summarized in Section 3.3.2. The detailed explanation of the reaction mechanism serves as the basis for the forthcoming discussion of the appropriate choice of catalysts and requirements due to the different intermediates. Experiments were either performed in the gas phase or in an electrochemical environment, whereas only the electrochemical experiments can be considered to bear a realistic resemblance of the fuel cell environment. Contrary to PEMFCs, where the oxygen reduction reaction is the rate-limiting step, in DMFCs the slow kinetics of the MOR represent the hmiting factor. 

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