The Reduction of Oxygen on Pt ‐ TiO2 Coated Ti Electrodes in Alkaline Solution

Abstract

The electrochemical reduction of O2 was studied on TiO2 and normalPt‐TiO2 coated Ti electrodes using the rotating disk electrode technique. The normalPt‐TiO2 coatings were prepared by the thermal decomposition method in the Pt composition range 10–100 wt %. Tafel plots with two distinct slope regions were observed for the reduction of O2 on the normalPt‐TiO2 electrodes of high Pt content. The electrocatalytic activity toward oxygen reduction decreased remarkably for the electrodes containing less than 35% Pt. The activity decrease was explained by an electrode resistance increase at lower Pt contents. Cyclic voltammetric measurements revealed that the electrode behavior was strongly dependent on the Pt content in the coating. The surface of electrodes was characterized by X‐ray diffraction, scanning electron microscopy, and X‐ray photoelectron spectroscopy. © 1999 The Electrochemical Society. All rights reserved.

Titanium–tantalum oxide as a support for Pd nanoparticles for the oxygen reduction reaction in alkaline electrolytes

“…Titanium-based materials have been widely studied in literature as supports for noble metal catalysts such as Pt or Au and mainly in acid media [50][51][52]. Recently, there has been a growing interest of this type of catalysts for alkaline media [53,54], also in combination with carbon materials [55,56]. Up to our knowledge, Pd supported on Ta-doped titanium oxide has not been studied in alkaline electrolytes until now.…”

Determinación del área de superficie real de electrodos de titanio modificado con platino por voltamperometría cíclica

“…Así, TAMMEVESKI et al [11] mostraron una variación del factor de rugosidad de 15 a 50 con el contenido de Pt desde 50 a 80% en peso, en un electrodo de Pt/TiO 2 sobre un disco de Ti. Por otro lado, MENTUS [12] informó un factor de rugosidad de 67 en un electrodo de Pt/TiO 2 sobre una barra de Ti.…”

“…Por otro lado, MENTUS [12] informó un factor de rugosidad de 67 en un electrodo de Pt/TiO 2 sobre una barra de Ti. En ambos trabajos [11,12] obtuvieron el factor de rugosidad por la integración de la corriente bajo los picos de desorción de hidrógeno y con un tratamiento del sustrato de Ti pulido mecánicamente. Esta diferencia puede ser explicada como una consecuencia del pulido mecánico realizado en los sustratos de Ti por [11,12], comparado con el tratamiento realizado en este trabajo sobre el sustrato vidrio/Ti.…”

“…En ambos trabajos [11,12] obtuvieron el factor de rugosidad por la integración de la corriente bajo los picos de desorción de hidrógeno y con un tratamiento del sustrato de Ti pulido mecánicamente. Esta diferencia puede ser explicada como una consecuencia del pulido mecánico realizado en los sustratos de Ti por [11,12], comparado con el tratamiento realizado en este trabajo sobre el sustrato vidrio/Ti. Además, se destaca el procedimiento utilizado en este trabajo para obtener los valores de SA r y f r a partir de la carga del oxígeno desorbido en los electrodos de Ti/Pt/TiO 2 .…”

Titania‐Coated Platinum Thin Films by MOCVD: Electrochemical and Photoelectrochemical Properties

“…TiO 2 -coated Pt films on glass rods would appear ideal materials for electrode system construction. Pt or TiO 2 -coated Pt (Pt-TiO 2 ) electrodes can be prepared by various methods such as thermal decomposition, [9,28] electro-and electroless deposition, [9,[29][30][31][32] sol-gel process, [9,33] sputtering, [9,24] and CVD. [34,35] Although the metal-organic (MO)CVD procedure is attractive because it allows for the preparation of thin films with a fairly precise control of the structure and thickness, as well as enhancing conformal coverage of non-planar substrates, [36] it has rarely been employed for the preparation of metal or metal oxide layers for electrode use in dynamic electrochemical experiments.…”