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  • Seaweed biomass derived (Ni,Co)/CNT nanoaerogels: efficient bifunctional electrocatalysts for oxygen evolution and reduction reactions

    Author(s)
    Ma, Na
    Jia, Yi Alec
    Yang, Xianfeng
    She, Xilin
    Zhang, Longzhou
    Peng, Zhi
    Yao, Xiangdong
    Yang, Dongjiang
    Griffith University Author(s)
    Yao, Xiangdong
    Yang, Dongjiang
    Jia, Yi
    Zhang, Longzhou
    Year published
    2016
    Metadata
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    Abstract
    Developing earth-abundant, active and stable electrocatalysts which operate in two-electrode rechargeable metal–air batteries, including both oxygen evolution and reduction reactions (OER and ORR), is vital for renewable energy conversion in real application. Here, we demonstrate a three-dimensional (3D) bifunctional nanoaerogel electrocatalyst that exhibits good electrocatalytic properties for both OER and ORR. This material was fabricated using a scalable and facile method involving the pyrolysis of (Ni,Co)/CNT alginate hydrogels derived from sustainable seaweed biomass after an ion exchange process. The bifunctionality ...
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    Developing earth-abundant, active and stable electrocatalysts which operate in two-electrode rechargeable metal–air batteries, including both oxygen evolution and reduction reactions (OER and ORR), is vital for renewable energy conversion in real application. Here, we demonstrate a three-dimensional (3D) bifunctional nanoaerogel electrocatalyst that exhibits good electrocatalytic properties for both OER and ORR. This material was fabricated using a scalable and facile method involving the pyrolysis of (Ni,Co)/CNT alginate hydrogels derived from sustainable seaweed biomass after an ion exchange process. The bifunctionality for oxygen electrocatalysis as shown by the OER–ORR potential difference (ΔE, the OER and ORR potentials are taken at the current densities of 10 mA cm−2 and −3 mA cm−2 in 0.1 M KOH, respectively) could be reduced to as low as 0.87 V, comparable to the state-of-the-art non-noble bifunctional catalysts. The good performance was attributed to the ternary Ni/NiO/NiCo2O4 catalytic center for charge transfer and 3D hierarchical mesoporous hybrid framework for efficient mass transport. More importantly, the Zn–air battery fabricated with the hybrid nanoaerogel as a bifunctional electrocatalyst displays very high energy efficiency (58.5%) and long-term stability. Prospectively, our present work may pave a new way to develop earth-abundant and low cost high-performance bifunctional electrocatalysts for rechargeable metal–air batteries.
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    Journal Title
    Journal of Materials Chemistry A
    Volume
    4
    DOI
    https://doi.org/10.1039/C6TA00591H
    Subject
    Macromolecular and Materials Chemistry not elsewhere classified
    Macromolecular and Materials Chemistry
    Materials Engineering
    Interdisciplinary Engineering
    Publication URI
    http://hdl.handle.net/10072/100169
    Collection
    • Journal articles

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