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Bifunctional CoNi/CoFe2O4 /Ni Foam Electrodes for Efficient Overall Water Splitting at a High Current Density

Abstract

It is always full of challenge to develop a kind of low-cost electrode with high activity and superior durability for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in electrolysis of water at a high current density. In this study, a novel electrocatalyst composed of earth abundant metals of Ni, Fe, and Co with three-dimensional (3D) nanostructure and high activity is successfully fabricated on Ni foam (NF) substrate through a facile hydrothermal synthesis method followed with electrodeposition. The electrode has three levels of porous structures including the bottom supermacroporous NF substrate, the flower-like CoFe2O4 with macroporous structure, and the topmost mesoporous nanosheets of CoNi(oxy)hydroxide. Since this hierarchical architecture of CoNi/CoFe2O4/NF is binder-free, more catalytic active sites can be exposed, enhancing electron transport, and providing open-channels for effective release of gas. As a result, CoNi/CoFe2O4/NF shows highly efficient electrocatalytic activity toward OER with an overpotential of 360 (±5) mV to achieve a current density as high as 1000 mA cm−2 in alkaline medium. Meanwhile, as a cathode catalyst, it also exhibits excellent performance toward HER with overpotentials as low as 82 (±3) and 189 (±3) mV to deliver current densities of 10 and 100 mA cm−2, respectively. Furthermore, when it is applied as the bifunctional catalyst for overall water splitting, current densities of 10 mA cm-2 and 100 mA cm-2 are obtained at applied potentials of 1.57 and 1.75 V, respectively, with excellent durability.

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Publication details

The article was accepted on 14 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA08223E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Bifunctional CoNi/CoFe2O4 /Ni Foam Electrodes for Efficient Overall Water Splitting at a High Current Density

    S. Li, S. Sirisomboonchai, A. Yoshida, X. An, X. Hao, A. Abudula and G. Guan, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08223E

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