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Thin MoS2 nanosheets grafted MOFs-derived porous Co–N–C flakes grown on electrospun carbon nanofibers as self-supported bifunctional catalysts for overall water splitting

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Abstract

Active and stable non-precious metal electrocatalysts are critical for the large-scale production of hydrogen/oxygen. Herein, a facile strategy for the in situ growth of MOFs combined with carbonization and subsequent solvothermal treatment for the rational design of thin MoS2 nanosheets grafted Co–N–C flakes (CoNC@MoS2) and grown on electrospun carbon nanofibers (CNFs) as bifunctional electrocatalysts for both hydrogen and oxygen evolution reactions (HER/OER) is reported. Binder-free CoNC@MoS2/CNF films exhibited unique hierarchical architectures with interconnected vine-like CNFs, which imparted favorable flexibility and satisfactory electrical conductivity to the self-supported electrocatalysts for electrochemical reactions. Due to the synergistic effect of the CoNC@MoS2 hybrid nanostructures and fast mass-transport properties of porous carbons, the resultant CoNC@MoS2/CNFs exhibited high catalytic activities and favorable stabilities for the HER and OER in a basic medium. When acting as electrocatalytic electrodes for overall water splitting, CoNC@MoS2/CNF films displayed a low overpotential of 1.62 V to generate a current density of 10 mA cm−2 with remarkable stability at different voltages for 200 000 s, and even outperformed Pt/C–RuO2 electrode in high current density water electrolysis. This study highlights the rational design of hybrid nanostructures based on MOFs and CNFs as efficient self-supported electrocatalysts, opening new possibilities for the fabrication of functional free-standing materials in energy chemistry.

Graphical abstract: Thin MoS2 nanosheets grafted MOFs-derived porous Co–N–C flakes grown on electrospun carbon nanofibers as self-supported bifunctional catalysts for overall water splitting

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Publication details

The article was received on 15 Sep 2017, accepted on 25 Oct 2017 and first published on 25 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA08166A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Thin MoS2 nanosheets grafted MOFs-derived porous Co–N–C flakes grown on electrospun carbon nanofibers as self-supported bifunctional catalysts for overall water splitting

    D. Ji, S. Peng, L. Fan, L. Li, X. Qin and S. Ramakrishna, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA08166A

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