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  • A Heterostructure Coupling of Exfoliated Ni–Fe Hydroxide Nanosheet and Defective Graphene as a Bifunctional Electrocatalyst for Overall Water Splitting

    Author(s)
    Jia, Yi
    Zhang, Longzhou
    Gao, Guoping
    Chen, Hua
    Wang, Bei
    Zhou, Jizhi
    Soo, Mun Teng
    Hong, Min
    Yan, Xuecheng
    Qian, Guangren
    Zou, Jin
    Du, Aijun
    Yao, Xiangdong
    Griffith University Author(s)
    Yao, Xiangdong
    Yan, Xuecheng
    Jia, Yi
    Zhang, Longzhou
    Wang, Bei
    Year published
    2017
    Metadata
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    Abstract
    Herein, the authors demonstrate a heterostructured NiFe LDH-NS@DG10 hybrid catalyst by coupling of exfoliated Ni–Fe layered double hydroxide (LDH) nanosheet (NS) and defective graphene (DG). The catalyst has exhibited extremely high electrocatalytic activity for oxygen evolution reaction (OER) in an alkaline solution with an overpotential of 0.21 V at a current density of 10 mA cm−2, which is comparable to the current record (≈0.20 V in Fe–Co–Ni metal-oxide-film system) and superior to all other non-noble metal catalysts. Also, it possesses outstanding kinetics (Tafel slope of 52 mV dec−1) for the reaction. Interestingly, ...
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    Herein, the authors demonstrate a heterostructured NiFe LDH-NS@DG10 hybrid catalyst by coupling of exfoliated Ni–Fe layered double hydroxide (LDH) nanosheet (NS) and defective graphene (DG). The catalyst has exhibited extremely high electrocatalytic activity for oxygen evolution reaction (OER) in an alkaline solution with an overpotential of 0.21 V at a current density of 10 mA cm−2, which is comparable to the current record (≈0.20 V in Fe–Co–Ni metal-oxide-film system) and superior to all other non-noble metal catalysts. Also, it possesses outstanding kinetics (Tafel slope of 52 mV dec−1) for the reaction. Interestingly, the NiFe LDH-NS@DG10 hybrid has also exhibited the high hydrogen evolution reaction (HER) performance in an alkaline solution (with an overpotential of 115 mV by 2 mg cm−2 loading at a current density of 20 mA cm−2) in contrast to barely HER activity for NiFe LDH-NS itself. As a result, the bifunctional catalyst the authors developed can achieve a current density of 20 mA cm−2 by a voltage of only 1.5 V, which is also a record for the overall water splitting. Density functional theory calculation reveals that the synergetic effects of highly exposed 3d transition metal atoms and carbon defects are essential for the bifunctional activity for OER and HER.
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    Journal Title
    Advanced Materials
    Volume
    29
    Issue
    17
    DOI
    https://doi.org/10.1002/adma.201700017
    Subject
    Physical Chemistry of Materials
    Physical Sciences
    Chemical Sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/341222
    Collection
    • Journal articles

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