Issue 17, 2022

Valence state modulation of Mn/FePO4 nanostructures for the oxygen reduction reaction

Abstract

The oxygen reduction reaction (ORR) is the limiting factor in many renewable technologies, for example, metal–air batteries and fuel cells, that have received a lot of scientific attention. Herein, we first prepared Mn-doped FePO4 nanoparticles encased in phosphorus incorporated reduced graphene oxide (PhG) sheets. The electrocatalyst gets a significant boost in ORR activity via adjustment of the Mn valence state when the as-prepared m-MnFePO4@PhG is modified by the chemical reduction method. The optimized r-MnFePO4@PhG shows an impressive half-wave potential (E1/2) of 0.73 V vs. RHE and limiting current density (JL) of 5.16 mA cm−2 at 0.1 V (1600 rpm) which reach close to those of Pt/C (20 wt%) (E1/2 = 0.77 V and JL = 5.51 mA cm−2). Moreover, the catalyst exhibits strong methanol tolerance and retains 94.7% of the original current density after ∼14 h of testing under alkaline conditions.

Graphical abstract: Valence state modulation of Mn/FePO4 nanostructures for the oxygen reduction reaction

Supplementary files

Article information

Article type
Paper
Submitted
19 Jun 2022
Accepted
19 Jul 2022
First published
19 Jul 2022

Sustainable Energy Fuels, 2022,6, 4001-4007

Valence state modulation of Mn/FePO4 nanostructures for the oxygen reduction reaction

Z. Ahmed, Krishankant, P. K. Sachdeva, R. Kaur, S. Kumari, C. Bera and V. Bagchi, Sustainable Energy Fuels, 2022, 6, 4001 DOI: 10.1039/D2SE00842D

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