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  • Controlling the adsorption behavior of hydrogen at the interface of polycrystalline CVD graphene

    Author(s)
    Guo, Yanru
    Seo, Dong Han
    Hong, Jungmi
    Su, Dawei
    Wang, Hongxia
    Zheng, Jie
    Li, Xingguo
    Murphy, Anthony B
    Ostrikov, Kostya Ken
    Griffith University Author(s)
    Ostrikov, Ken
    Year published
    2018
    Metadata
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    Abstract
    Polycrystalline graphene films were synthesized from renewable biomaterials in ambient air using a facile and rapid thermal chemical vapour deposition technique. Characterization of the graphene reveals a large surface area, the presence of nanoscale domains and open edges, atomic-level stacking, and high electrical conductivity, which are favorable features for electrochemical hydrogen evolution reactions (HERs). The numerous boundaries and open edges accelerate the gas diffusion process and enlarge the effective reactive surface area for gas evolution, which is responsible for a significant improvement of HER performance ...
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    Polycrystalline graphene films were synthesized from renewable biomaterials in ambient air using a facile and rapid thermal chemical vapour deposition technique. Characterization of the graphene reveals a large surface area, the presence of nanoscale domains and open edges, atomic-level stacking, and high electrical conductivity, which are favorable features for electrochemical hydrogen evolution reactions (HERs). The numerous boundaries and open edges accelerate the gas diffusion process and enlarge the effective reactive surface area for gas evolution, which is responsible for a significant improvement of HER performance and stability compared to a commercial graphene film. The hydrogen adhesion behavior in investigated for both bare Ni foil/foam and graphene grown on Ni foil/foam samples. The hydrogen gas bubbles adhere to the polycrystalline graphene for a long period of time before detaching, in contrast to their behavior on the pristine Ni foil surface. Post treatment of the graphene film using plasma treatment increases the desorption rate of hydrogen bubbles from the surface. The results indicate a wide range of possibilities for use of graphene-based catalysts in electrocatalytic gas evolution reactions.
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    Journal Title
    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
    Volume
    43
    Issue
    41
    DOI
    https://doi.org/10.1016/j.ijhydene.2018.07.204
    Subject
    Chemical sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/385378
    Collection
    • Journal articles

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