DirectCoulometryAtControlledPotential

DirectCoulometryAtControlledPotential [OSW39536efc22a64f39b0c2e8b845a36278]
ID	OSW39536efc22a64f39b0c2e8b845a36278
UUID	39536efc-22a6-4f39-b0c2-e8b845a36278
Label	DirectCoulometryAtControlledPotential
Machine compatible name	DirectCoulometryAtControlledPotential
Statements (outgoing)

Statements (incoming)

Description

Coulometry at a preselected constant potential of the working electrode.

Item
Type(s)/Category(s)	EmmoTerm

Term

EmmoTerm
Superclass	Coulometry
Comment	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. [en] 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. [en]
URI	http://emmo.info/electrochemistry#electrochemistry_39536efc_22a6_4f39_b0c2_e8b845a36278

jsondata

uuid

"39536efc-22a6-4f39-b0c2-e8b845a36278"

name

"DirectCoulometryAtControlledPotential"

label

text	"DirectCoulometryAtControlledPotential"
lang	"en"

description

text	"Coulometry at a preselected constant potential of the working electrode."
lang	"en"

type

"Category:OSW57beed5e1294434ba77bb6516e461456"

uri

"http://emmo.info/electrochemistry#electrochemistry_39536efc_22a6_4f39_b0c2_e8b845a36278"

comment

text	"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"

subClassOf

"http://emmo.info/electrochemistry#electrochemistry_6e439f86_3d00_4b0b_82ab_1fa25241d4e9"

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Description

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