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Issue 2, 2018
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Highly efficient oxygen evolution electrocatalysts prepared by using reduction-engraved ferrites on graphene oxide

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Abstract

Rational design and synthesis of efficient, stable and low-cost electrocatalysts for oxygen evolution reaction (OER) is critical for renewable energy conversion and storage. Herein, the reduction-engraved strategy was adopted to treat crystalline ferrite nanoparticles, which are highly dispersed on graphene oxide (GO) nanosheets. This reduction treatment generated abundant oxygen vacancies on the surface of nano-scale ferrites and dramatically enhanced their surface area, ensuring that the ferrite nanoparticles possess more accessible active sites for OER, and improve their electronic conductivity. Reduced cobalt/nickel ferrite (Co0.5Ni0.5Fe2O4, r-CNF), cobalt ferrite (CoFe2O4, r-CF) and nickel ferrite (NiFe2O4, r-NF) nanoparticles anchoring on the ultrathin GO nanosheets can act as highly active, stable and low-cost OER electrocatalysts in 1.0 M KOH solution. The r-CNF (Co : Ni = 1 : 1) on GO (r-CNFg) shows the best OER performance among the ferrite-based OER electrocatalysts, with an overpotential of 210 mV at 10 mA cm−2 in 1.0 M KOH solution, much more efficient than that of a commercial benchmark catalyst IrO2 (230 mV). The catalytic current density of r-CNFg at 1.49 V vs. RHE is about 50 times higher than that of CNF and CNFg. Also, it exhibits prominent electrochemical stability over 500 h in 1.0 M KOH.

Graphical abstract: Highly efficient oxygen evolution electrocatalysts prepared by using reduction-engraved ferrites on graphene oxide

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Publication details

The article was received on 03 Nov 2017, accepted on 28 Nov 2017 and first published on 08 Dec 2017


Article type: Research Article
DOI: 10.1039/C7QI00681K
Citation: Inorg. Chem. Front., 2018,5, 310-318
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    Highly efficient oxygen evolution electrocatalysts prepared by using reduction-engraved ferrites on graphene oxide

    J. Tan, P. Sahoo, J. Wang, Y. Hu, Z. Zhang and T. Lu, Inorg. Chem. Front., 2018, 5, 310
    DOI: 10.1039/C7QI00681K

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