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Uniquely integrated Fe-doped Ni(OH)2 nanosheets for highly efficient oxygen and hydrogen evolution reactions


Developing high-efficiency electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is vital for the production of hydrogen on a large scale by electrocatalytic splitting of water. Here, Fe-doped Ni(OH)2 nanosheets directly grown on commercial Ni foam (FeNiOH/NF) are fabricated through a facile hydrothermal methodology in (NH4)2S2O8 aqueous solution with iron salts. The integrated architecture with hierarchical pores is beneficial for exposing sufficient catalytically active sites and providing evaluated structure and electrical properties. Specially, the Fe-induced partial-charge-transfer greatly modifies the electronic structure of Ni(OH)2, which evidently promotes the electrocatalytic activity of the fabricated FeNiOH/NF for OER and HER. As thus, as electrocatalyst for OER, FeNiOH/NF exhibits excellent OER activity with an overpotential of 271 and 318 mV to deliver a current density of 20 and 100 mA cm-2 with a small Tafel slope of 72 mV dec-1 in 1.0 M KOH, demonstrating the very high level of novelty and sufficient advance over the current state-of-the-art IrO2 benchmark. Most important, there only increases 23 mV during continuous reaction over 20 h at the applied potential of 1.62 V to deliver 500 mA cm-2. It also enables a high HER activity with robust stability. Finally, an overall water splitting current density of 10 mA cm 2 can be obtained at a cell voltage of 1.67 V in a two-electrode alkaline electrolyzer using FeNiOH/NF as both anode and cathode, along with impressive operation stability. This development with significant advance can be widely extended to large-scale fabrication of versatile electrocatalysts for efficient water splitting technology.

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Publication details

The article was received on 27 Feb 2018, accepted on 14 May 2018 and first published on 15 May 2018

Article type: Paper
DOI: 10.1039/C8NR01655K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Uniquely integrated Fe-doped Ni(OH)2 nanosheets for highly efficient oxygen and hydrogen evolution reactions

    J. Ren, G. Yuan, C. Weng, L. Chen and Z. Yuan, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01655K

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