The specific role of water for ion electrosorption at charged interfaces
In this proposal, we plan to fundamentally improve the current understanding of the active role of water in the electric double layer (EDL) formation at charged carbon/aqueous electrolyte interfaces in electric double layer capacitors (EDLCs). This will be done by employing small-angle neutron scattering (SANS) at D22 in an in-situ EDLC cell set-up and contrast variation using H2O and D2O solvents in combination with RbBr salt. A very similar coherent scattering length of Rb and Br will allow to assume a three-phase system consisting of carbon, ions and solvent, to separate the Q-dependent contribution of the solvent upon charging and discharging. A third solvent with zero-scattering-length density (Z-SLD) water will further allow separating volume changes of the pore space due to adsorption induced deformation from changes of local solvent density. The obtained results from this proposed experiment are considered essential to improve the energy storage performance of EDLCs.
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SEYFFERTITZ Malina; PARIS Oskar; PORCAR Lionel; RAUSCHER Max Valentin and STOCK Sebastian. (2021). The specific role of water for ion electrosorption at charged interfaces. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-228
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