Электрокатализ реакций восстановления O2 и H2O2 на оксидах марганца

Abstract : Manganese oxides are of great interest due to their catalytic activity towards the ORR (the oxygen reduction reaction) in alkaline media and can be used as noble metal-free materials for the cathode in liquid and polymer electrolyte alkaline fuel cells. The present thesis is devoted to the investigation of the ORR activity of manganese oxides. It was shown that Mn2O3 with bixbyite structure has a better catalytic activity toward the ORR in alkaline media than other investigated manganese oxide, the surface activity of Mn2O3 is only 4 times lower than that of Pt at an overvoltage of 0.3 V (RHE). The link between the structure of Mn oxides and the ORR activity is found: the specific ORR activity exponentially increases with the potential of the surface Mn(III)/Mn(IV) red-ox couple. To ensure the high electrocatalytic activity of Mn2O3, it is necessary to add carbon to the electrode composition, as well as to keep potential above 0.7 V (RHE).
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Anna Ryabova. Электрокатализ реакций восстановления O2 и H2O2 на оксидах марганца. Theoretical and/or physical chemistry. Université de Strasbourg, 2018. Russian. ⟨NNT : 2018STRAF011⟩. ⟨tel-01930148⟩

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