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The electrochemical reduction of hydrogen peroxide ͑H 2 O 2 ͒ has been studied on a series of simulated nuclear fuel ͑SIMFUEL͒ materials with different amounts of simulated fission products. Steady-state polarization measurements under diffusioncompensated conditions show that the reaction proceeds with a weak dependence on applied potential and fractional reaction orders with respect to H 2 O 2 . A mechanism for H 2 O 2 reduction on SIMFUEL materials is proposed to explain these features. It is found that the activity of the material for the H 2 O 2 reduction reaction increases with the doping level. This increase can be attributed to noble metal particles present in the SIMFUEL. This enhanced reactivity is most apparent at low overpotentials, where H 2 O 2 reduction proceeds significantly faster on the noble metal particles than on the UO 2+x lattice.

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