Publication

A phenomenological model for macroscopic deactivation of surface processes

Christos Comninellis, Hannes Bleuler
2004
Journal Articles

Abstract

There is a wide class of electrochemical systems which present a sudden transition from a high to a low reaction rate region in function of an external parameter. This sudden transition is accompanied by the growth of a surface structure responsible for deactivation of the process. Analysing a simple phenomenological model of a generic surface process shows that the growth of this deactivating structure implies a hysteresis according a forward and reverse scan in the external control parameter. Application to water electrolysis, metal passivation and ethylene oxidation on Rh/TiO2/YSZ under open-circuit and under electrochemical promotion is discussed.

Official source

https://infoscience.epfl.ch/entities/publication/fbc0356e-8db1-4eee-945c-55a2a5f86680

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Christos Comninellis, Hannes Bleuler
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fbc0356e-8db1-4eee-945c-55a2a5f86680

About this result

Related concepts (32)

Admittance parameters

Admittance parameters or Y-parameters (the elements of an admittance matrix or Y-matrix) are properties used in many areas of electrical engineering, such as power, electronics, and telecommunications. These parameters are used to describe the electrical behavior of linear electrical networks. They are also used to describe the small-signal (linearized) response of non-linear networks. Y parameters are also known as short circuited admittance parameters.

Ethylene oxide

Ethylene oxide is an organic compound with the formula . It is a cyclic ether and the simplest epoxide: a three-membered ring consisting of one oxygen atom and two carbon atoms. Ethylene oxide is a colorless and flammable gas with a faintly sweet odor. Because it is a strained ring, ethylene oxide easily participates in a number of addition reactions that result in ring-opening. Ethylene oxide is isomeric with acetaldehyde and with vinyl alcohol. Ethylene oxide is industrially produced by oxidation of ethylene in the presence of a silver catalyst.

Impedance parameters

Impedance parameters or Z-parameters (the elements of an impedance matrix or Z-matrix) are properties used in electrical engineering, electronic engineering, and communication systems engineering to describe the electrical behavior of linear electrical networks. They are also used to describe the small-signal (linearized) response of non-linear networks. They are members of a family of similar parameters used in electronic engineering, other examples being: S-parameters, Y-parameters, H-parameters, T-parameters or ABCD-parameters.

Related publications (2)

A phenomenological model for macroscopic deactivation of surface processes

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