Randles–Ševčík equation
E656454
The Randles–Ševčík equation is a fundamental electrochemical relationship that links peak current in cyclic voltammetry to the concentration and diffusion coefficient of a redox-active species.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Randles–Ševčík equation canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7330991 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Randles–Ševčík equation Context triple: [Cottrell equation, relatedConcept, Randles–Ševčík equation]
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A.
Butler–Volmer equation
The Butler–Volmer equation is a fundamental relation in electrochemistry that describes how the rate of an electrode reaction (current density) depends on the electrode potential and reaction kinetics.
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B.
Nernst–Planck equation
The Nernst–Planck equation is a fundamental relation in electrochemistry that describes the flux of charged species under the combined influence of diffusion, electric fields, and, in extended forms, convection.
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C.
Nernst equation
The Nernst equation is a fundamental electrochemistry formula that relates the reduction potential of a half-cell to the standard electrode potential, temperature, and activities (or concentrations) of the chemical species involved.
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D.
Cottrell equation
The Cottrell equation is a fundamental relation in electrochemistry that describes how current decays over time during a diffusion-controlled potential step at an electrode.
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E.
Debye–Hückel theory
Debye–Hückel theory is a foundational model in physical chemistry that explains how electrostatic interactions between ions in solution affect properties such as activity coefficients and equilibrium behavior in electrolytes.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Randles–Ševčík equation Target entity description: The Randles–Ševčík equation is a fundamental electrochemical relationship that links peak current in cyclic voltammetry to the concentration and diffusion coefficient of a redox-active species.
-
A.
Butler–Volmer equation
The Butler–Volmer equation is a fundamental relation in electrochemistry that describes how the rate of an electrode reaction (current density) depends on the electrode potential and reaction kinetics.
-
B.
Nernst–Planck equation
The Nernst–Planck equation is a fundamental relation in electrochemistry that describes the flux of charged species under the combined influence of diffusion, electric fields, and, in extended forms, convection.
-
C.
Nernst equation
The Nernst equation is a fundamental electrochemistry formula that relates the reduction potential of a half-cell to the standard electrode potential, temperature, and activities (or concentrations) of the chemical species involved.
-
D.
Cottrell equation
The Cottrell equation is a fundamental relation in electrochemistry that describes how current decays over time during a diffusion-controlled potential step at an electrode.
-
E.
Debye–Hückel theory
Debye–Hückel theory is a foundational model in physical chemistry that explains how electrostatic interactions between ions in solution affect properties such as activity coefficients and equilibrium behavior in electrolytes.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
analytical chemistry equation
ⓘ
electrochemical equation ⓘ |
| appliesTo |
both anodic and cathodic peak currents in reversible systems
ⓘ
diffusion-controlled processes ⓘ reversible electrochemical reactions ⓘ |
| assumes |
Nernstian behavior at the electrode surface
ⓘ
no significant double-layer charging current ⓘ no significant ohmic drop ⓘ planar electrode geometry ⓘ semi-infinite linear diffusion ⓘ |
| category |
electroanalytical methods
ⓘ
voltammetry ⓘ |
| contrastsWith | kinetically controlled current expressions ⓘ |
| dependsOn | temperature through the numerical constant ⓘ |
| derivationBasedOn |
Fick's laws of diffusion
NERFINISHED
ⓘ
Nernst equation NERFINISHED ⓘ |
| describes | relationship between peak current and diffusion-controlled redox processes ⓘ |
| field |
analytical chemistry
ⓘ
electrochemistry ⓘ |
| hasForm | ip = (2.69 × 10^5) n^(3/2) A C D^(1/2) v^(1/2) at 25 °C for reversible systems ⓘ |
| influencedBy | number of electrons transferred in the redox reaction ⓘ |
| involves | Faradaic current ⓘ |
| mathematicalForm |
peak current proportional to concentration of electroactive species
ⓘ
peak current proportional to square root of diffusion coefficient ⓘ peak current proportional to square root of scan rate ⓘ |
| namedAfter |
John Edward Brough Randles
NERFINISHED
ⓘ
Zdeněk Ševčík NERFINISHED ⓘ |
| relatesQuantity |
concentration of redox-active species
ⓘ
diffusion coefficient ⓘ peak current ⓘ scan rate ⓘ temperature ⓘ |
| usedFor |
analysis of cyclic voltammograms
ⓘ
characterization of electrochemical reversibility ⓘ determination of concentration of electroactive species ⓘ determination of diffusion coefficients ⓘ |
| usedIn | cyclic voltammetry ⓘ |
| usedToEstimate | electrode area from calibration measurements ⓘ |
| validUnder |
small amplitude potential perturbations relative to formal potential window
ⓘ
supporting electrolyte in excess ⓘ |
| variable |
A (electrode area)
ⓘ
C (bulk concentration) ⓘ D (diffusion coefficient) ⓘ ip (peak current) ⓘ n (number of electrons transferred) ⓘ v (potential scan rate) ⓘ |
How these facts were elicited
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Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Randles–Ševčík equation Description of subject: The Randles–Ševčík equation is a fundamental electrochemical relationship that links peak current in cyclic voltammetry to the concentration and diffusion coefficient of a redox-active species.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.