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Issue 22, 2018
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Controllable synthesis of NiO/Ni3S2 hybrid arrays as efficient electrocatalysts for water splitting

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Abstract

It is significant to develop economically cheaper, more environmentally friendly bifunctional electrocatalysts for both water reduction reaction (WRR) and water oxidation reaction (WOR). In this paper, a NiO/Ni3S2 core–shell hybrid directly grown on nickel foam is constructed using a simple two-step hydrothermal and sulfuration method. When the NiO/Ni3S2/NF electrode is first tested as a catalyst, it reveals a high catalytic activity and durability for WOR. The smaller overpotential of only 270 mV obtained at 30 mA cm−2 is better than the benchmark of precious metal RuO2 materials (410 mV @ 30 mA cm−2), benefiting from the unique hierarchical structure of NiO/Ni3S2/NF with more active sites and fast electron transfer. Moreover, the NiO/Ni3S2/NF electrode also exhibits a fairly good WRR performance compared with the individual NiO/NF and NF electrodes, showing a smaller overpotential of only 130 mV at 10 mA cm−2. In addition to this, a very low cell voltage of 1.59 V is obtained at 10 mA cm−2 in 1.0 M KOH, when NiO/Ni3S2/NF is also tested as a bifunctional water splitting electrode. The experimental results indicate that the oxide/sulfide-based catalysts could serve as an ideal electrode candidate and bring the superiority of a synergistic strategy into full play, which offers a new idea toward the development of efficient and environmentally friendly water splitting electrochemical electrode materials.

Graphical abstract: Controllable synthesis of NiO/Ni3S2 hybrid arrays as efficient electrocatalysts for water splitting

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Publication details

The article was received on 31 Aug 2018, accepted on 02 Oct 2018 and first published on 02 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ04446E
Citation: New J. Chem., 2018,42, 18201-18207
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    Controllable synthesis of NiO/Ni3S2 hybrid arrays as efficient electrocatalysts for water splitting

    X. Du, Q. Wang and X. Zhang, New J. Chem., 2018, 42, 18201
    DOI: 10.1039/C8NJ04446E

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