Unusual demetalation and ordered adsorption of a pyridine-appended zinc phthalocyanine at metal-electrolyte interfaces studied by in situ scanning tunneling microscopy and X-ray photoelectron spectroscopy
| Autor: | Duc Thanh Pham, Stephan Breuer, Uwe Hahn, Tomás Torres, Thanh Hai Phan, Klaus Wandelt |
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| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Chemistry Inorganic chemistry Iodide Electrolyte Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound General Energy X-ray photoelectron spectroscopy law Electrode Phthalocyanine Physical and Theoretical Chemistry Cyclic voltammetry Scanning tunneling microscope |
| Zdroj: | Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia instname |
| Popis: | A combination of cyclic voltammetry, in situ electrochemical scanning tunneling microscopy (EC-STM), and ex situ X-ray photoelectron spectroscopy (XPS) studies was employed to investigate the electrochemical behavior and to characterize the structure of adsorbed layers of a redox-active pyridine-appended zinc phthalocyanine (ZnPc) at Cu(100)/electrolyte interfaces. Additional cyclic voltammograms (CVs) of a HOPG electrode in phthalocyanine- and iodide-containing electrolyte showed four redox peak pairs related to the phthalocyanine macrocycle. Focusing on the reduction processes, the four observed cathodic waves were assigned to four single electron transfer steps causing four successive reductions of the phthalocyanine. Due to its narrow potential window, the CV of Cu(100) in the same electrolyte covers only the first three reduction features in the acidic solution superimposed by the CuI formation/dissolution processes. Surprisingly, the XPS data from the iodide and phthalocyanine covered Cu(100) surfac... |
| Databáze: | OpenAIRE |
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