Category:OSW0ecb8a448dcf514f87647aeb6bddcf39: Difference between revisions

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Latest revision as of 06:04, 1 March 2025

DirectCoulometryAtControlledPotential
ID	OSW0ecb8a448dcf514f87647aeb6bddcf39
UUID	0ecb8a44-8dcf-514f-8764-7aeb6bddcf39
Label	DirectCoulometryAtControlledPotential
Machine compatible name	DirectCoulometryAtControlledPotential
Statements (outgoing)

Statements (incoming)

Description

In principle, the end point at which I = 0, i.e. when the concentration of species under study becomes zero, can be reached only at infinite time. However, in practice, the electrolysis is stopped when the current has decayed to a few percent of the initial value and the charge passed at infinite time is calculated from a plot of charge Q(t) against time t. For a simple system under diffusion control Qt= Q∞[1 − exp(−DAt/Vδ)], where Q∞ = limt→∞Q(t) is the total charge passed at infinite time, D is the diffusion coefficient of the electroactive species, A the electrode area, δ the diffusion layer thickness, and V the volume of the solution.

Category (Class)

OWL Class
Imported fromA prefixed IRI defining this entry as a imported term. In OSW the prefix must be a registered imported ontology.<br>Definition: OWL Class	https://w3id.org/emmo/domain/characterisation-methodology/chameo#DirectCoulometryAtControlledPotential

EmmoClass
Supercategories<br>Definition: Category (Class), OWL Class, EmmoClass	Coulometry
metaclass<br>Definition: Category (Class), EmmoClass	EmmoClass

Graph

Attachments

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jsondata

rdf_type

"owl:Class"

uuid

"0ecb8a44-8dcf-514f-8764-7aeb6bddcf39"

iri

"https://w3id.org/emmo/domain/characterisation-methodology/chameo#DirectCoulometryAtControlledPotential"

name

"DirectCoulometryAtControlledPotential"

label

text	"DirectCoulometryAtControlledPotential"
lang	"en"

description

text

"Coulometry at a preselected constant potential of the working electrode. Direct coulometry at controlled potential is usually carried out in convective mass trans- fer mode using a large surface working electrode. Reference and auxiliary electrodes are placed in separate compartments. The total electric charge is obtained by integration of the I–t curve or can be measured directly using a coulometer."

lang

"en"

text

"In principle, the end point at which I = 0, i.e. when the concentration of species under study becomes zero, can be reached only at infinite time. However, in practice, the electrolysis is stopped when the current has decayed to a few percent of the initial value and the charge passed at infinite time is calculated from a plot of charge Q(t) against time t. For a simple system under diffusion control Qt= Q∞[1 − exp(−DAt/Vδ)], where Q∞ = limt→∞Q(t) is the total charge passed at infinite time, D is the diffusion coefficient of the electroactive species, A the electrode area, δ the diffusion layer thickness, and V the volume of the solution."

lang

"en"