Jump to main content
Jump to site search

Issue 1, 2015
Previous Article Next Article

Fe-containing polyimide-based high-performance ORR catalysts in acidic medium: a kinetic approach to study the durability of catalysts

Author affiliations

Abstract

The ORR activity and durability of Fe-containing non-precious N-doped carbon catalysts in acidic medium were studied using a rotating ring-disk electrode voltammetry and XPS technique. The catalysts (Fe/PI) were synthesised from the pyrolysis of the Fe(acac)3 and polyimide nanoparticle (PI) mixture. The catalytic activity and durability of Fe/PI are superior to that of the conventional phthalocyanine-based catalyst. The onset potential of ORR was 0.915 V vs. RHE in 0.5 M H2SO4 which is very close to that of a commercially available Pt/C catalyst. The Fe/PI catalyst sustains its activity and stability even after 11 110 repeating potential steps between 0.6 and 1.0 V vs. RHE in O2-saturated 0.5 M H2SO4 and 1110 potential cycles between 1.0 and 1.5 V vs. RHE in argon-saturated 0.5 M H2SO4, respectively. The kinetic and mechanistic analyses of the ORR on this catalyst indicate that the ORR, as a whole, follows a 4-electron (parallel) pathway. The N 1s XPS spectra before and after the durability test indicate that pyridinic and graphite-like nitrogens take part in improving the ORR activity, whereas nitrogen oxides have a negative role in the ORR. The loss of ORR activity was observed after the acid washing of the catalysts, which suggests the role of Fe in the overall 4-electron reduction of O2.

Graphical abstract: Fe-containing polyimide-based high-performance ORR catalysts in acidic medium: a kinetic approach to study the durability of catalysts

Back to tab navigation

Publication details

The article was received on 02 Aug 2014, accepted on 05 Sep 2014 and first published on 05 Sep 2014


Article type: Paper
DOI: 10.1039/C4CY01001A
Author version
available:
Download author version (PDF)
Catal. Sci. Technol., 2015,5, 475-483

  •   Request permissions

    Fe-containing polyimide-based high-performance ORR catalysts in acidic medium: a kinetic approach to study the durability of catalysts

    A. Muthukrishnan, Y. Nabae, T. Hayakawa, T. Okajima and T. Ohsaka, Catal. Sci. Technol., 2015, 5, 475
    DOI: 10.1039/C4CY01001A

Search articles by author

Spotlight

Advertisements