Titanium/Chromium Oxide Composite Electrodes – Basic Characteristics

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Abstract
Ti sheet has been activated by the ceramic method, starting from solutions of Cr‐III‐chloride and Ti‐IV‐butanolate in isopropanole:A) via firing in air, TA = 350 – 750°C.B) As (A), but subsequent annealing in vacuum at TV = 450 – 850°C.Coulometric, chemical and X ray analysis led to the following results: Electrode A has a layer of α‐Cr2O3 at TA ≥ 450°C, which is anodically oxidized in 1 M H2SO4. With slow cyclic voltammetry, half peak potential is Up/2 (SHE) = 1.77 V. CrO3, which is formed, dissolves. The charge involved in this process is proportional to layer thickness. Electrodes fabricated by mode B carry predominantly a chromium layer at TV ≥ 700°C. These electrodes exhibited a dissolution peak at Up/2 (SHE) = 1.32 V (CrO3). It relates to the transpassive dissolution of chromium. – Steady state and nonsteady anodic and cathodic processes have been investigated with these new electrodes. Their application for electroorganic oxidations via redox catalysis is proposed.

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