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Issue 20, 2016
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An electron injection promoted highly efficient electrocatalyst of FeNi3@GR@Fe-NiOOH for oxygen evolution and rechargeable metal–air batteries

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Abstract

Efficient catalysts for oxygen evolution reactions (OERs) are a key renewable energy technology for fuel cells, metal–air batteries and water splitting, but few non-precious oxygen electrode catalysts with high activity have been discovered. Here, we propose a general strategy based on electron injection to manipulate the work function of electrocatalysts to obtain an extraordinary performance beyond precious catalysts. Based on the density functional theory calculation, the NiOOH/Ni hybrid reveals the smallest overpotential compared to NiOOH. A novel hybrid catalyst is designed to grow Fe-doped NiOOH on graphene-encapsulated FeNi3 nanodots (FeNi3@GR@Fe-NiOOH). Accordingly, the catalyst exhibits excellent OER activity and superior durability, affording a low onset potential of 1.45 V vs. reversible hydrogen electrode (RHE) and a stable current density of 11.0 mA cm−2 at 1.6 V (vs. RHE) for over 12 h. The achieved turnover frequency of 1.16 s−1 at an overpotential of 300 mV is the best performance among the reported similar catalysts, and even better than that of the state-of-the-art noble-metal catalysts (RuO2 and IrO2). The high electrocatalytic efficiency and robust durability are essential conditions for a superior air electrode material for Zn–air batteries. Our catalyst cycled stably for 360 cycles at 1 mA cm−2 in 20 h with no obvious attenuation over 100 cycles for 100 h.

Graphical abstract: An electron injection promoted highly efficient electrocatalyst of FeNi3@GR@Fe-NiOOH for oxygen evolution and rechargeable metal–air batteries

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Supplementary files

Article information


Submitted
21 Feb 2016
Accepted
18 Apr 2016
First published
18 Apr 2016

J. Mater. Chem. A, 2016,4, 7762-7771
Article type
Paper

An electron injection promoted highly efficient electrocatalyst of FeNi3@GR@Fe-NiOOH for oxygen evolution and rechargeable metal–air batteries

X. Wang, X. Liu, C. Tong, X. Yuan, W. Dong, T. Lin, L. Liu and F. Huang, J. Mater. Chem. A, 2016, 4, 7762
DOI: 10.1039/C6TA01541G

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