Tuning morphology, composition and oxygen reduction reaction (ORR) catalytic performance of manganese oxide particles fabricated by γ-radiation induced synthesis
Journal article, 2021

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.

γ-radiation induced synthesis

ORR

4-electron transfer

MnOx nanoparticles

Author

Zhuofeng Li

Royal Institute of Technology (KTH)

Yi Yang

Royal Institute of Technology (KTH)

Axel Relefors

Royal Institute of Technology (KTH)

Xiangyang Kong

Jiaotong University

Gerard Montserrat Siso

Chalmers, Physics, Chemical Physics

Björn Wickman

Chalmers, Physics, Chemical Physics

Yohannes Kiros

Royal Institute of Technology (KTH)

Inna L. Soroka

Royal Institute of Technology (KTH)

Journal of Colloid and Interface Science

0021-9797 (ISSN)

Vol. 583 71-79

New fuel cell catalyst materials with nanostructured model electrodes

Swedish Research Council (VR), 2019-01-01 -- 2022-12-31.

Subject Categories

Inorganic Chemistry

Materials Chemistry

Other Chemistry Topics

DOI

10.1016/j.jcis.2020.09.011

PubMed

32979712

More information

Latest update

10/16/2020