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Issue 37, 2019
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Metal–organic-framework-derived porous 3D heterogeneous NiFex/NiFe2O4@NC nanoflowers as highly stable and efficient electrocatalysts for the oxygen-evolution reaction

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Abstract

The development of inexpensive electrocatalysts with excellent oxygen-evolution reaction (OER) performance is the key to expanding the applications of water-splitting chemistry. However, catalysts that simultaneously take into account activity and stability are generally difficult to fabricate. Herein, heterogeneous NiFex/NiFe2O4 nanoflowers were successfully embedded in an N-doped graphitic carbon (NC) matrix with a porous 3D superstructure in a simple partial oxidation process after the pyrolysis of a metal–organic framework (MOF). The optimized heterogeneous NiFex/NiFe2O4@NC nanoflower catalyst exhibited high OER performance in terms of its low overpotential of 262 mV at 10 mA cm−2 and outstanding long-term stability (for 150 h) in 1 M KOH as the electrolyte, which are mainly ascribable to its intrinsic heterogeneous and 3D porous structure. First-principles computations confirmed that NiFex/NiFe2O4@NC requires a lower overpotential to promote OER, compared with those of single-component catalysts, which further highlights that this material is a promising low-cost and highly efficient OER electrocatalyst candidate.

Graphical abstract: Metal–organic-framework-derived porous 3D heterogeneous NiFex/NiFe2O4@NC nanoflowers as highly stable and efficient electrocatalysts for the oxygen-evolution reaction

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Supplementary files

Article information


Submitted
25 Jul 2019
Accepted
03 Sep 2019
First published
04 Sep 2019

J. Mater. Chem. A, 2019,7, 21338-21348
Article type
Paper

Metal–organic-framework-derived porous 3D heterogeneous NiFex/NiFe2O4@NC nanoflowers as highly stable and efficient electrocatalysts for the oxygen-evolution reaction

J. Zhao, X. Zhang, M. Liu, Y. Jiang, M. Wang, Z. Li and Z. Zhou, J. Mater. Chem. A, 2019, 7, 21338
DOI: 10.1039/C9TA08077E

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