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Stratigraphic analysis of intercalated graphite electrodes in aqueous inorganic acid solutions

Nano Research 2022年第2期15卷 1120-1127页

作者： Stefania De Rosa Paolo Branchini valentina spampinato Alexis Franquet Rossella Yivlialin Lamberto Duo Gianlorenzo Bussetti Luca Tortora LASR3 Surface Analysis Laboratory INFN Roma Trevia della Vasca Navale 8400146 RomeItaly Department of Mathematics and Physics Roma Tre Universityvia della Vasca Navale 8400146 RomeItaly Imec Kapeldreef 75B-3001 LeuvenBelgium Helmholtz-Zentrum Berlin fiir Materialen und Energie GmbH Institute for Solar Fuels(EE-IF)Hahn-Meitner-Platz 1D-14109 BerlinGermany Department of Physics Politecnico di MilanoPiazza Leonardo da Vinci 321-20133 MilanoItaly Department of Science Roma Tre Universityvia della Vasca Navale 8400146 RomeItaly

A detailed stratigraphic investigation of the intercalation mechanism when graphite electrodes are immersed inside diluted perchloric(HClO_(4))and sulfuric(H_(2)SO_(4))electrolytes is obtained by comparing results when graphite crystals are simply immersed in the same acid *** 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 *** 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 *** 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 *** material from the electrolyte solution was found localized in well-defined circular spots,which represent preferential interaction ***,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.

关键词： highly oriented pyrolytic graphite(HOPG) intercalation graphite graphene time-of-flight secondary ion mass spectrometry(ToF-SIMS) atomic force microscopy(AFM)

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