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Issue 29, 2018
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NiFe LDH nanodots anchored on 3D macro/mesoporous carbon as a high-performance ORR/OER bifunctional electrocatalyst

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Abstract

Low electric conductivity and low active-site exposure due to the preferable bulk crystallization are among the major obstacles for NiFe layered hydroxides (NiFe LDHs) to be a viable electrocatalyst. Herein, we report the growth of highly loaded (47 wt%) NiFe LDH nanodots (ca. 3 nm) on N-doped three-dimensional (3D) macro/mesoporous carbon (nNiFe/3D MPC). The defect-rich mesopores on the wall of 3D MPC are shown to play a critical role in the high-load and size-limited growth of NiFe LDH, by providing abundant adsorption sites for precursor cations to cause instantaneous nucleation, and at the same time acting as confined reactors for size-limited growth. Also by overcoming the conductivity and active site exposure problems of NiFe LDH, the unique structure of nNiFe LDH/3D MPC evokes intimate interfacial coupling of NiFe LDH and N-doped carbon, and enhanced stabilization of the nanodots through space confinement, making it an excellent bifunctional oxygen electrocatalyst. It exhibits a record low potential gap of 0.71 V between the OER and ORR in 0.1 M KOH for a single non-precious electrocatalyst, with the OER and ORR activity surpassing those of most of the reported NiFe LDHs and N-doped carbons, respectively, and endows a rechargeable Zn–air battery with high power density and durability.

Graphical abstract: NiFe LDH nanodots anchored on 3D macro/mesoporous carbon as a high-performance ORR/OER bifunctional electrocatalyst

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Supplementary files

Article information


Submitted
05 Jun 2018
Accepted
25 Jun 2018
First published
28 Jun 2018

J. Mater. Chem. A, 2018,6, 14299-14306
Article type
Paper

NiFe LDH nanodots anchored on 3D macro/mesoporous carbon as a high-performance ORR/OER bifunctional electrocatalyst

W. Wang, Y. Liu, J. Li, J. Luo, L. Fu and S. Chen, J. Mater. Chem. A, 2018, 6, 14299
DOI: 10.1039/C8TA05295F

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