Issue 19, 2012

Oxygen reduction activity of Pd–Mn3O4nanoparticles and performance enhancement by voltammetrically accelerated degradation

Abstract

Electrochemical properties of Pd–Mn3O4 nanoparticles toward oxygen reduction reaction (ORR) in acidic media were investigated. The catalysts were prepared by polyol reduction of Pd(acac)2 and thermal decomposition of Mn2(CO)10. Surface composition and structure of the particles vary depending on the injection temperature of Mn2(CO)10 and are closely related to the electrochemical properties. The presence of Mn3O4 promotes the performance towards ORR by facilitating oxygen transfer to the active sites of Pd. Through an accelerated degradation test (ADT), nanoparticles with a Pd-rich shell are obtained by dissolution of surface exposed Mn3O4 and at 0.57 V (vs. Ag/AgCl) this catalyst shows the highest activity towards ORR, 149% in mass activity and 142% in specific activity compared to that of Pd/C.

Graphical abstract: Oxygen reduction activity of Pd–Mn3O4 nanoparticles and performance enhancement by voltammetrically accelerated degradation

Supplementary files

Article information

Article type
Paper
Submitted
27 Dec 2011
Accepted
23 Mar 2012
First published
26 Mar 2012

Phys. Chem. Chem. Phys., 2012,14, 6842-6848

Oxygen reduction activity of Pd–Mn3O4 nanoparticles and performance enhancement by voltammetrically accelerated degradation

C. H. Choi, S. H. Park and S. I. Woo, Phys. Chem. Chem. Phys., 2012, 14, 6842 DOI: 10.1039/C2CP24128E

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