Localisation of electrochemical oxidation processes in nickel and cobalt hexacyanoferrates investigated by analysis of the multiplet patterns in X-ray photoelectron spectra
Literature Information
Stefan Sauter, Gunther Wittstock, Rüdiger Szargan
Nickel and cobalt hexacyanoferrate-modified gold electrodes were prepared by electrochemical synthesis. These samples were investigated by X-ray photoelectron spectroscopy (XPS) after removal of the modified electrodes from the electrochemical cell at different potentials and transfer into the ultra high vacuum of the spectrometer. A careful analysis of the multiplet splitting of the 2p photoemission lines of the transition metal ions and comparison with suitable reference compounds and with calculations reveals that the electrochemical oxidation occurs at the iron sites in K2Ni[Fe(CN)6] and at the cobalt sites in the related compound K2Co[Fe(CN)6].
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.












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1-yl}-1-butanesulfonate structure Sodium 4-{2-[(E)-2-{(3E)-3-{(2E)-2-[3,3-dimethyl-1-(4-sulfonatobutyl)-1,3-dihydro-2H-indol-2-ylidene]ethylidene}-2-[(4-isothiocyanatophenyl)sulfanyl]-1-cyclohexen-1-yl}vinyl]-3,3-dimethyl-3H-indolium-
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