Tuning morphology, composition and oxygen reduction reaction (ORR) catalytic performance of manganese oxide particles fabricated by γ-radiation induced synthesis

• Published in: Journal of colloid and interface science Vol. 583; pp. 71 - 79
• Main Authors: Li, Zhuofeng, Yang, Yi, Relefors, Axel, Kong, Xiangyang, Siso, Gerard Montserrat, Wickman, Björn, Kiros, Yohannes, Soroka, Inna L.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.02.2021
• Subjects: 4-electron transfer; MnOx nanoparticles; ORR; γ-radiation induced synthesis; MnOx nanoparticles; 4-electron transfer; γ-radiation induced synthesis; ORR
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/j.jcis.2020.09.011

[Display omitted] •Manganese oxide nano-catalysts are fabricated by γ-radiation induced method.•Morphology and composition of MnOx are tuned by the synthesis conditions.•Oxygen reduction reaction (ORR) activity of the obtained material is studied.•Hollow spherical γ-MnO2 particles exhibit a 4-electron transfer pathway.•Mn3O4 (with composition 2MnO-MnO2) nanorods favour an incomplete 2-electron pathway. A γ-radiation induced synthesis method is used to fabricate manganese oxide catalysts through both reduction and oxidation routes. It is shown that the morphology, composition and electrochemical performance of the produced manganese oxide particles can be tuned by altering the redox conditions. The catalysts prepared via radiolytic oxidation have a hollow spherical morphology, possess γ-MnO2 structure and show high catalytic activity for the complete four-electron reaction pathway of the oxygen reduction reaction (ORR) in alkaline electrolyte. Meanwhile, the catalysts synthesized via radiolytic reduction possess a rod-like morphology with a Mn3O4 bulk structure and favour the incomplete two-electron reaction pathway for ORR. The high catalytic activity of the manganese oxide synthesized via the oxidation route can be attributed to high electrochemical surface area and increased amount of Mn3+ on the surface as compared to those in the sample obtained via the reduction route.