A Strategy for Increasing the Efficiency of the Oxygen Reduction Reaction in Mn-Doped Cobalt Ferrites

Journal of the American Chemical Society
Yin XiongHéctor D Abruña

Abstract

Alkaline fuel cells have drawn increasing attention as next-generation energy-conversion devices for electrical vehicles, since high pH enables the use of non-precious-metal catalysts. Herein, we report on a family of rationally designed Mn-doped cobalt ferrite (MCF) spinel nanocrystals, with an optimal composition Mn0.8(CoFe2)0.73O4 (MCF-0.8), that are effective electrocatalysts for the oxygen reduction reaction. MCF-0.8 exhibits a half-wave potential ( E1/2) of 0.89 V vs RHE in 1 M NaOH, only 0.02 V less than that of commercial Pt/C under identical testing conditions and, to the best of our knowledge, one of the highest recorded values in the literature. Moreover, MCF-0.8 exhibits remarkable durability (Δ E1/2 = 0.014 V) after 10 000 electrochemical cycles. In situ X-ray absorption spectroscopy (XAS) reveals that the superior performance of the trimetallic MCF-0.8 originates from the synergistic catalytic effect of Mn and Co, while Fe helps preserve the spinel structure during cycling. We employed in situ XAS to track the evolution of the oxidation states and the metal-oxygen distances not only under constant applied potentials (steady state) but also during dynamic cyclic voltammetry (CV) (nonsteady state). The periodic conv...Continue Reading

References

Jun 22, 2005·Journal of Synchrotron Radiation·B Ravel, M Newville
Feb 21, 2007·Nature Materials·Vojislav R StamenkovicNenad M Markovic
Jan 28, 2012·Journal of the American Chemical Society·Yongye LiangHongjie Dai
May 4, 2013·Chemical Society Reviews·Yan-Jie WangJiujun Zhang
Dec 4, 2014·Journal of the American Chemical Society·Arindam IndraMatthias Driess
Feb 18, 2016·Chemical Reviews·Minhua ShaoRegis Chenitz
Jan 17, 2019·Journal of the American Chemical Society·Yao YangHéctor D Abruña
Jan 24, 2019·Proceedings of the National Academy of Sciences of the United States of America·Yin XiongHéctor D Abruña

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Citations

Jul 19, 2021·Advances in Colloid and Interface Science·Hong QinChanglin Wang
May 5, 2021·Annual Review of Analytical Chemistry·Bruna F Baggio, Yvonne Grunder
Nov 20, 2019·Journal of the American Chemical Society·Yao YangHéctor D Abruña
Jun 28, 2019·Journal of the American Chemical Society·Yin XiongHéctor D Abruña

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