Abstract
A detailed stratigraphic investigation of the intercalation mechanism when graphite electrodes are immersed inside diluted perchloric (HClO4) and sulfuric (H2SO4) electrolytes is obtained by comparing results when graphite crystals are simply immersed in the same acid solutions. By combining time-of-flight secondary ion mass spectrometry (ToF-SIMS) and in-situ atomic force microscopy (AFM), we provide a picture of the chemical species involved in the intercalation reaction. The depth intensity profile of the ion signals along the electrode crystal clearly shows a more complex mechanism for the intercalation process, where the local morphology of the basal plane plays a crucial role. Solvated anions are mostly located within the first tens of nanometers of graphite, but electrolytes also diffuse inside the buried layers for hundreds of nanometers, the latter process is also aided by the presence of mesoscopic crystal defects. Residual material from the electrolyte solution was found localized in well-defined circular spots, which represent preferential interaction areas. Interestingly, blister-like micro-structures similar to those observed on the highly oriented pyrolytic graphite (HOPG) surface were found in the buried layers, confirming the equivalence of the chemical condition on the graphite surface and in the underneath layers.
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01 November 2021
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Acknowledgements
The TOF-SIMS/AFM instrument was financially supported by the HERCULES foundation (now FWO). Part of this project has received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement (No. 688225) (Metro4-3D). This work has been partially funded by the National Institute for Nuclear Physics in the framework of the CSN5 Call Project FIRE (Flexible Ionizing Organic Radiation Detectors). LASR3 Surface Analysis Laboratory Roma Tre gratefully acknowledges financial support from “Fondazione Roma” (No. 5229441F37). The sample preparation has been performed in the Solid-Liquid Interface and Nanomicroscopy (SoLINano) lab that is an inter-Departmental facility of the Politecnico di Milano. We want to thank Sergio Augusto Barcelo Lins for the artwork in the graphical abstract.
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De Rosa, S., Branchini, P., Spampinato, V. et al. Stratigraphic analysis of intercalated graphite electrodes in aqueous inorganic acid solutions. Nano Res. 15, 1120–1127 (2022). https://doi.org/10.1007/s12274-021-3614-6
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DOI: https://doi.org/10.1007/s12274-021-3614-6