Multi‐Component PtFeCoNi Core‐Shell Nanoparticles on MWCNTs as Promising Bifunctional Catalyst for Oxygen Reduction and Oxygen Evolution Reactions

Author:

Braun Tobias1,Dinda Sirshendu1,Karkera Guruprakash1ORCID,Melinte Georgian12,Diemant Thomas1ORCID,Kübel Christian234ORCID,Fichtner Maximilian12ORCID,Pammer Frank1ORCID

Affiliation:

1. Helmholtz Institute Ulm Helmholtzstraße 11 89081 Ulm Germany |

2. Institute of Nanotechnology Karlsruhe Institute of Technology (KIT) Hermannvon-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany

3. Department of Materials and Earth Sciences Technical University of Darmstadt Alarich-Weiss-Straße 2 64287 Darmstadt Germany

4. Karlsruhe Nano Micro Facility (KNMF) Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany

Abstract

AbstractThe development of commercially viable fuel cells and metal‐air batteries requires effective and cheap bifunctional catalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). Multi‐component Pt−Fe−Co−Ni nanoparticles on multi‐walled carbon nanotubes (MWCNTs) were synthesized by wet chemistry route via NaBH4 reduction of metal salts, followed by sintering at different temperatures. The catalyst demonstrates an excellent ORR activity and a promising OER activity in 0.1 m KOH, with a bi‐functional over‐potential, ΔE of 0.83 V, which is comparable to the values of Pt/C or RuO2. Furthermore, it shows outstanding long‐term stability in ORR and OER, namely diffusion limited current density at a potential of 0.3 V decreased just by 5.5 % after 10000 cycles in ORR. The results of the PFCN@NT300 indicate a significant effect of the substitution of Pt by the transition metal (TM) and the formation of nanoparticles on the catalytic performance, especially in the OER.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

General Chemistry

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