Selective Proton Transport for Hydrogen Production Using Graphene Oxide Membranes
- Lukas MadaußLukas MadaußFaculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, GermanyMore by Lukas Madauß,
- Tobias FollerTobias FollerSchool of Materials Science and Engineering, University of New South Wales, Kensington, New South Wales 2052, AustraliaMore by Tobias Foller,
- Jannik PlaßJannik PlaßFaculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, GermanyMore by Jannik Plaß,
- Priyank V. KumarPriyank V. KumarSchool of Chemical Engineering, University of New South Wales, Sydney, New South Wales 2052, AustraliaMore by Priyank V. Kumar,
- Tiziana MussoTiziana MussoSchool of Materials Science and Engineering, University of New South Wales, Kensington, New South Wales 2052, AustraliaMore by Tiziana Musso,
- Kirsten DunkhorstKirsten DunkhorstFaculty of Engineering and Physics, University of Duisburg-Essen, 47057 Duisburg, GermanyMore by Kirsten Dunkhorst,
- Rakesh Joshi*Rakesh Joshi*Email: [email protected]School of Materials Science and Engineering, University of New South Wales, Kensington, New South Wales 2052, AustraliaMore by Rakesh Joshi, and
- Marika Schleberger*Marika Schleberger*Email: [email protected]Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, GermanyMore by Marika Schleberger
Abstract
Graphene oxide has shown exceptional properties in terms of water permeability and filtration characteristics. Here the suitability of graphene oxide membranes for the spatial separation of hydronium and hydroxide ions after photocatalytic water splitting is demonstrated. Instead of relying on classical size exclusion by adjusting the membrane laminates’ interlayer spacings, nonmodified graphene oxide is used to exploit the presence of its natural functional groups and surface charges for filtration. Despite a significantly larger interlayer spacing inside the membrane compared with the size of the hydrated radii of the ions, highly asymmetric transport behavior and a 6 times higher mobility for hydronium than for hydroxide are observed. DFT simulations reveal that hydroxide ions are more prone to interact and stick to the functional groups of graphene oxide, while diffusion of hydronium ions through the membrane is less impeded and aligns well with the concept of the Grotthuss mechanism.
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