Publication

Morphological and microstructural study of the titanium/iridium oxide (IrO2)-tantalum oxide (Ta2O5) electrode: effect of the preparation temperature

Christos Comninellis
1991
Journal Articles

Abstract

The morphol. examn. and the structural anal. of DSA-O2 electrodes [IrO2-Ta2O5 (70:30 mol%) coating] show that at moderate firing temp. (about 550 Deg), sepn. of phases occurs with the formation of agglomerates of IrO2 crystals and amorphous Ta2O5. At higher temp. (.apprx.750 Deg) both cryst. IrO2 and Ta2O5 are present. The electrochem. active surface area, as measured by cyclic voltammetry, is found to decrease with increasing prepn. temps. The shapes of voltammograms are strongly influenced by the nature of the base metal, showing its contribution to the electrochem. measurements, due to the porous nature of the coating. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/82269358-4ab1-40a0-96a6-fc3e90be7c4b

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Christos Comninellis
1991
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/82269358-4ab1-40a0-96a6-fc3e90be7c4b

About this result

Related concepts (31)

Tantalum pentoxide

Tantalum pentoxide, also known as tantalum(V) oxide, is the inorganic compound with the formula Ta2O5. It is a white solid that is insoluble in all solvents but is attacked by strong bases and hydrofluoric acid. Ta2O5 is an inert material with a high refractive index and low absorption (i.e. colourless), which makes it useful for coatings. It is also extensively used in the production of capacitors, due to its high dielectric constant.

Tantalum

Tantalum is a chemical element with the symbol Ta and atomic number 73. Previously known as tantalium, it is named after Tantalus, a figure in Greek mythology. Tantalum is a very hard, ductile, lustrous, blue-gray transition metal that is highly corrosion-resistant. It is part of the refractory metals group, which are widely used as components of strong high-melting-point alloys. It is a group 5 element, along with vanadium and niobium, and it always occurs in geologic sources together with the chemically similar niobium, mainly in the mineral groups tantalite, columbite and coltan.

Cyclic voltammetry

In electrochemistry, cyclic voltammetry (CV) is a type of potentiodynamic measurement. In a cyclic voltammetry experiment, the working electrode potential is ramped linearly versus time. Unlike in linear sweep voltammetry, after the set potential is reached in a CV experiment, the working electrode's potential is ramped in the opposite direction to return to the initial potential. These cycles of ramps in potential may be repeated as many times as needed.

Related publications (2)

Morphological and microstructural study of the titanium/iridium oxide (IrO2)-tantalum oxide (Ta2O5) electrode: effect of the preparation temperature

Chat with Graph Search

Electrochemical promotion of catalysts for gas phase reactions

Properties of diamond electrodes for wastewater treatment