Synergistic Effect of Sn and Fe in Fe-N_x Site Formation and Activity in Fe-N-C Catalyst for ORR.

ABSTRACT: Iron-nitrogen-carbon (Fe-N-C) materials emerged as one of the best non-platinum group material (non-PGM) alternatives to Pt/C catalysts for the electrochemical reduction of O₂ in fuel cells. Co-doping with a secondary metal center is a possible choice to further enhance the activity toward oxygen reduction reaction (ORR). Here, classical Fe-N-C materials were co-doped with Sn as a secondary metal center. Sn-N-C according to the literature shows excellent activity, in particular in the fuel cell setup; here, the same catalyst shows a non-negligible activity in 0.5 M H₂SO₄ electrolyte but not as high as expected, meaning the different and uncertain nature of active sites. On the other hand, in mixed Fe, Sn-N-C catalysts, the presence of Sn improves the cataly

SUBMITTER: Mazzucato M 

PROVIDER: S-EPMC9756292 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature