Publication

Characterization of dimensionally stable anodes DSA-type oxygen evolving electrodes. Choice of base metal

Christos Comninellis
1991
Journal Articles

Résumé

In the search for a good DSA-type O2-evolving electrode, the influence of the base metal (titanium, tantalum, zirconium, niobium and some of their alloys) on the performance of IrO2-Ta2O5 coated electrodes, was investigated. The thermal behavior and oxygen affinity sequence of the metals, in relation to the electrode prepn. procedure, were detd. thermogravimetrically. The chem. and electrochem. stability of the base metal was found to be directly related, through the wear mechanism, to the service life of the electrode, measured in 30% H2SO4 at 80 Deg and 750 mA cm-2. Tantalum-based electrodes were shown to have the highest service life; 1700 h, compared with the 120 h for titanium-based electrodes. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/5199ed18-b678-4eb4-9858-c9d6979392fc

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Christos Comninellis
1991
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/5199ed18-b678-4eb4-9858-c9d6979392fc

À propos de ce résultat

Concepts associés (23)

Tantalum capacitor

A tantalum electrolytic capacitor is an electrolytic capacitor, a passive component of electronic circuits. It consists of a pellet of porous tantalum metal as an anode, covered by an insulating oxide layer that forms the dielectric, surrounded by liquid or solid electrolyte as a cathode. Because of its very thin and relatively high permittivity dielectric layer, the tantalum capacitor distinguishes itself from other conventional and electrolytic capacitors in having high capacitance per volume (high volumetric efficiency) and lower weight.

Electrolytic capacitor

An electrolytic capacitor is a polarized capacitor whose anode or positive plate is made of a metal that forms an insulating oxide layer through anodization. This oxide layer acts as the dielectric of the capacitor. A solid, liquid, or gel electrolyte covers the surface of this oxide layer, serving as the cathode or negative plate of the capacitor. Because of their very thin dielectric oxide layer and enlarged anode surface, electrolytic capacitors have a much higher capacitance-voltage (CV) product per unit volume than ceramic capacitors or film capacitors, and so can have large capacitance values.

Polymer capacitor

A polymer capacitor, or more accurately a polymer electrolytic capacitor, is an electrolytic capacitor (e-cap) with a solid conductive polymer electrolyte. There are four different types: Polymer tantalum electrolytic capacitor (Polymer Ta-e-cap) Polymer aluminium electrolytic capacitor (Polymer Al-e-cap) Hybrid polymer capacitor (Hybrid polymer Al-e-cap) Polymer niobium electrolytic capacitors Polymer Ta-e-caps are available in rectangular surface-mounted device (SMD) chip style.

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Publications associées (5)

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Characterization of dimensionally stable anodes DSA-type oxygen evolving electrodes. Choice of base metal

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