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Issue 30, 2018
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Oxide/sulfide-based hybrid arrays as robust electrocatalysts for water splitting

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Abstract

It is imperative to develop bifunctional electrocatalysts with good activity and stability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In this paper, a hierarchical NiCo2O4/Ni3S2 hybrid is synthesized by direct growth on nickel foam (NF) using co-precipitation and sulfuration as a general two-step method. When the NiCo2O4/Ni3S2/NF material is used as an electrode, it displays high activity and perfect stability for OER. A low overpotential of only 360 mV is obtained at 40 mA cm−2, comparable to the benchmark of IrO2 electrodes (330 mV overpotential at 40 mA cm−2), benefiting from the particular hybrid structure of NiCo2O4/Ni3S2/NF with large surface area and fast electron transfer. In addition, the NiCo2O4/Ni3S2/NF sample also reveals a superior elevated HER activity compared to NiCo2O4/NF and NF catalysts individually, for which a low overpotential of only 143 mV is obtained at 10 mA cm−2. Beyond that, NiCo2O4/Ni3S2/NF is also used as a bifunctional water splitting catalyst, for which a very low cell voltage of 1.58 V is acquired at 10 mA cm−2 in 1.0 M KOH. The results reveal that oxide/sulfide-based materials can be used as a perfect electrode candidate and afford the advantage of the synergy strategy, which opens a new route toward desired water splitting electrochemical devices of high activity and environmentally friendly electrode materials.

Graphical abstract: Oxide/sulfide-based hybrid arrays as robust electrocatalysts for water splitting

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Publication details

The article was received on 15 May 2018, accepted on 04 Jul 2018 and first published on 04 Jul 2018


Article type: Paper
DOI: 10.1039/C8DT01961D
Citation: Dalton Trans., 2018,47, 10273-10280
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    Oxide/sulfide-based hybrid arrays as robust electrocatalysts for water splitting

    X. Du, Q. Wang, Y. Li and X. Zhang, Dalton Trans., 2018, 47, 10273
    DOI: 10.1039/C8DT01961D

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