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
ⓘ
linked to:
Fick's first law of diffusion
Nernst equation ⓘ |
| 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
ⓘ
Zdeněk Ševčík ⓘ |
| 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
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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.