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Issue 32, 2015
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Nickel-rich layered LiNi1−xMxO2 (M = Mn, Fe, and Co) electrocatalysts with high oxygen evolution reaction activity

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Abstract

An understanding of the materials characteristics that lead to high electrocatalytic activity for the oxygen evolution reaction (OER) is needed to make electrolytic hydrogen fuel production and rechargeable metal-air batteries a reality. Here, the first systematic investigation of a family of Ni-rich layered LiNi1−xMxO2 (M = Mn, Fe, and Co) oxides reveals that the catalytic activity can be tuned by varying the Ni content, nature of the transition-metal dopant, lithium content, and degree of cation ordering between Li and Ni/M. In particular, Fe-doping in LiNi1−xMxO2 imparts the most dramatic improvements in OER activity, possibly due to the flexibility of Fe to adopt different coordination geometries on the surface. X-ray photoelectron spectroscopic (XPS) data reveal that the surface of the Fe-doped sample is enriched with Fe while ex situ Raman spectroscopy indicates that the layered morphology is preserved during electrochemical cycling, but the cation disorder increases. Among the various LiNi1−xMxO2 compositions investigated, LiNi0.7Co0.3Fe0.2O2 exhibits the highest OER activity, which increases further when excess lithium and oxygen vacancies are present, and good stability. The Ni-rich LiNi1−xMxO2 samples join a growing number of highly active iron-doped systems for OER electrocatalysis in alkaline conditions.

Graphical abstract: Nickel-rich layered LiNi1−xMxO2 (M = Mn, Fe, and Co) electrocatalysts with high oxygen evolution reaction activity

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Publication details

The article was received on 24 Jun 2015, accepted on 14 Jul 2015 and first published on 14 Jul 2015


Article type: Paper
DOI: 10.1039/C5TA04637H
J. Mater. Chem. A, 2015,3, 16604-16612

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    Nickel-rich layered LiNi1−xMxO2 (M = Mn, Fe, and Co) electrocatalysts with high oxygen evolution reaction activity

    V. Augustyn, S. Therese, T. C. Turner and A. Manthiram, J. Mater. Chem. A, 2015, 3, 16604
    DOI: 10.1039/C5TA04637H

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