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

Författare

Zhuofeng Li

Kungliga Tekniska Högskolan (KTH)

Yi Yang

Kungliga Tekniska Högskolan (KTH)

Axel Relefors

Kungliga Tekniska Högskolan (KTH)

Xiangyang Kong

Jiaotong University

Gerard Montserrat Siso

Chalmers, Fysik, Kemisk fysik

Björn Wickman

Chalmers, Fysik, Kemisk fysik

Yohannes Kiros

Kungliga Tekniska Högskolan (KTH)

Inna L. Soroka

Kungliga Tekniska Högskolan (KTH)

Journal of Colloid and Interface Science

0021-9797 (ISSN)

Vol. 583 71-79

Nya material för bränslecellskatalysatorer med nanostrukturerade modelelektroder

Vetenskapsrådet (VR), 2019-01-01 -- 2022-12-31.

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemi

DOI

10.1016/j.jcis.2020.09.011

Mer information

Senast uppdaterat

2020-10-16