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Issue 9, 2019
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Applied potential-dependent performance of the nickel cobalt oxysulfide nanotube/nickel molybdenum oxide nanosheet core–shell structure in energy storage and oxygen evolution

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Abstract

Nickel cobalt sulfide is widely applied to energy storage and electrocatalysis owing to its high electrical conductivity and multiple oxidation states. This study proposes NiCo2S4 and NiCo2OxSy@NiMoO4 core–shell structures as energy storage materials and electrocatalysts for the oxygen evolution reaction. A higher specific capacity of 2.22 mA h cm−2 (168.18 mA h g−1) at 10 mA cm−2 is obtained for the NiCo2OxSy@NiMoO4 electrode which is applied as the battery-type electrode in the battery supercapacitor hybrid, but a better electrocatalytic activity is achieved for the NiCo2S4 electrode with a smaller overpotential of 1.567 VRHE at 0.12 A cm−2 and a smaller Tafel slope of 86.1 mV dec−1. The electrochemically active surface area (ECSA) is larger for NiCo2S4 due to the nanoparticle-assembled nanotube wall, whereas NiCo2OxSy@NiMoO4 shows higher electrical conductivity owing to the presence of molybdenum. Different performances in energy storage and electrocatalysis for NiCo2S4 and NiCo2OxSy@NiMoO4 nanomaterials are caused by different potentials applied for driving the electrochemical reactions. This study for the first time proves that the trade-off between ECSA and electrical conductivity is important for designing nanomaterials applied in different electrochemical fields.

Graphical abstract: Applied potential-dependent performance of the nickel cobalt oxysulfide nanotube/nickel molybdenum oxide nanosheet core–shell structure in energy storage and oxygen evolution

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Publication details

The article was received on 29 Nov 2018, accepted on 23 Jan 2019 and first published on 06 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA11471D
Citation: J. Mater. Chem. A, 2019,7, 4626-4639

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    Applied potential-dependent performance of the nickel cobalt oxysulfide nanotube/nickel molybdenum oxide nanosheet core–shell structure in energy storage and oxygen evolution

    K. Chiu and L. Lin, J. Mater. Chem. A, 2019, 7, 4626
    DOI: 10.1039/C8TA11471D

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