Abstract
A fluorescence probe method, which enables highly sensitive detection of OH radicals (^.OH) by forming a stable fluorescent product, was applied to a model reaction system of PEFCs (Polymer Electrolyte Fuel Cells) for the first time. oOH was successfully detected under open circuit condition with a homemade test cell having reservoirs of a coumarin probe solution at both anode and cathode electrodes. The experiments with H₂O₂ and Fe²⁺ in the probe solution suggested that the ^.OH is produced via electrode reduction and oxidation of H₂O₂ at the anode and cathode, respectively.

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