Polymeric phthalocyanines and their precursors, 4. Optimization of electrochemical properties of polyphthalocyanine modified titanium electrodes

Abstract

Polyphthalocyanine (1) coatings on titanium foils were prepared by in situ synthesis starting from 1,2,4,5-tetracyanobenzene (3). In order to optimize the electrochemical activity of the polymer modified electrodes several parameters, e.g. pretreatment of Ti-foils, amount of 3, reaction temperature and time were varied. The layer of 1 was analyzed by UV/VIS-and IR-spectroscopy. Electrochemical measurements were carried out in K3, K4 [Fe(CN),] redox electrolyte. In comparison with a Pt-electrode the polymer modified Ti-electrodes show also high activity combined with stability.Electrodes prepared from other nitriles (4 -8) were investigated in principle only. ZUSAMMENFASSUNG:Schichten polymerer Phthalocyanine (1) auf Titanfolien wurden durch in situ Synthese, ausgehend von 1,2,4,5-Tetracyanbenzol (3), hergestellt. Zur Optimierung der elektrochemischen Aktivitat der Polymer-modifizierten Elektroden wurden verschiedene Parameter wie Vorbehandlung der Titanfolien, Menge an 3, Reaktionstemperatur und -zeit variiert. Die Schichten von 1 wurden durch UV/VIS-und IR-Spektroskopie analysiert. Elektrochemische Messungen wurden in dem Redoxelektrolyten K3, K4 [Fe(CN),] ausgefiihrt. Im Vergleich zu Platinelektroden zeigten die Polymermodifizierten Elektroden ebenfalls hohe Aktivitat und Stabilitat. Fur Elektroden aus anderen Nitrilen (4 -8) erfolgte nur eine grundsatzliche Charakterisierung.

Reversible Reduction and Reoxidation of Entire Thin Films of Octacyanophthalocyanine

“…The oxidation of sulfur dioxide has been investigated extensively in recent years. Most studies have been directed at direct electrochemical oxidation of SO2 on platinum, gold, alloy, carbon, or graphite electrodes (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17). A few investigations (18)(19)(20)(21)(22)(23)(24) were performed by using a chemical depolarizer, such as a halide ion, to facilitate the anodic oxidation of sulfur dioxide.…”

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The electrochemical properties of solid films of 3,9,10,16,17,23, Zn(II), Cu(II)] were studied by cyclic voltammetry in aqueous electrolytes. The thin (10-100 rim) film electrodes show remarkably stable electrochromic redox behavior, and the charge exchanged in the cathodic and anodic waves, respectively, was found to be between 2 and 3 F/tool for scan rates up to 400 mV/s.

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“…(2)]. Titanium electrodes covered with thin layers of polymeric phthalocyanines were found to exhibit faradaic activity comparable with platinum in redox electrolytes like [Fe(CN)6]4-/[Fe(CN)6] 3- (17,18). The effect of spectral sensitization of inorganic semiconductors by phthalocyanines on their photoelectrochemical and photovoltaic properties has been studied extensively (19)(20)(21)(22)(23)(24)(25).…”

Συνθεση Και Μελετη Φυσικων Και Θερμικων Ιδιοτητων Νεων Πολυμερων Με Ειδικες Χρησεις

“…Επιπλέον, δεν παράγονται πτητικά παραπροϊόντα και αποτελεί συνεπώς μία χρήσιμη αντίδραση για τη σύνθεση υψηλού μοριακού βάρους πολυμερών [146,147], Οι πολυμερείς φθαλοκυανίνες (1) και οι χαμηλού μοριακού βάρους φθαλοκυανίνες (2) παρουσιάζουν μεγάλο ενδιαφέρον ως υλικά ηλεκτροδίων γιατί συνδυάζουν καταλυτική και οξειδοαναγωγική συμπεριφορά και ειδικότερα στην περίπτωση του 1 και υψηλή ηλεκτρική αγωγιμότητα [148]. Ο R. Bannehr και οι συνεργάτες του [149]…”