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Overpotential for Cathodic Reaction from Tafel Equation Formula

GoOverpotential for Anodic Reaction from Tafel Equation Formula

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The Overpotential is the potential difference between a half-reaction's thermodynamically determined reduction potential and the potential at which the redox event is experimentally observed. Check FAQs

η = - (A slope) \cdot (\log 10 (\frac{i}{i 0}))

η - Overpotential?A_slope - Tafel Slope?i - Electric Current Density?i₀ - Exchange Current Density?

Overpotential for Cathodic Reaction from Tafel Equation Example

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Here is how the Overpotential for Cathodic Reaction from Tafel Equation equation looks like with Values.

Here is how the Overpotential for Cathodic Reaction from Tafel Equation equation looks like with Units.

Here is how the Overpotential for Cathodic Reaction from Tafel Equation equation looks like.

-0.03 = - (0.098) \cdot (\log 10 (\frac{0.405}{0.2}))

-0.03V = - (0.098V) \cdot (\log 10 (\frac{0.405A/m²}{0.2A/m²}))

-0.03 = - (0.098) \cdot (\log 10 (\frac{0.405}{0.2}))

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Overpotential for Cathodic Reaction from Tafel Equation Solution

Follow our step by step solution on how to calculate Overpotential for Cathodic Reaction from Tafel Equation?

FIRST Step Consider the formula

η = - (A slope) \cdot (\log 10 (\frac{i}{i 0}))

Next Step Substitute values of Variables

∴

η = - (0.098V) \cdot (\log 10 (\frac{0.405A/m²}{0.2A/m²}))

Next Step Prepare to Evaluate

∴

η = - (0.098) \cdot (\log 10 (\frac{0.405}{0.2}))

Next Step Evaluate

∴

η = -0.0300296526999674V

LAST Step Rounding Answer

∴

η = -0.03V

Overpotential for Cathodic Reaction from Tafel Equation Formula Elements

Variables

Functions

Overpotential

The Overpotential is the potential difference between a half-reaction's thermodynamically determined reduction potential and the potential at which the redox event is experimentally observed.

Symbol: η

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Overpotential

Tafel Slope

The Tafel Slope describes how the electrical current through an electrode depends on the voltage difference between the electrode and the bulk electrolyte. The Tafel slope is measured experimentally.

Symbol: A_slope

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Tafel Slope

Electric Current Density

The Electric current density is the amount of charge per unit of time that flows through the unit area of a chosen cross-section.

Symbol: i

Measurement: Surface Current DensityUnit: A/m²

Note: Value can be positive or negative.

Formulas to find Electric Current Density

Exchange Current Density

The Exchange Current Density is defined as the current in the absence of net electrolysis and at zero overpotential.

Symbol: i₀

Measurement: Surface Current DensityUnit: A/m²

Note: Value can be positive or negative.

Formulas to find Exchange Current Density

log10

The common logarithm, also known as the base-10 logarithm or the decimal logarithm, is a mathematical function that is the inverse of the exponential function.

Syntax: log10(Number)

Other Formulas to find Overpotential

Go Overpotential for Anodic Reaction from Tafel Equation

η = + (A slope) \cdot (\log 10 (\frac{i}{i 0}))

Other formulas in Tafel Slope category

Go Tafel Slope for Anodic Reaction from Tafel Equation

A slope = + \frac{η}{\log 10 (\frac{i}{i 0})}

Go Tafel Slope for Cathodic Reaction from Tafel Equation

A slope = - \frac{η}{\log 10 (\frac{i}{i 0})}

Go Current Density for Anodic Reaction from Tafel Equation

i = (10^{\frac{η}{A slope}}) \cdot i 0

Go Current Density for Cathodic Reaction from Tafel Equation

i = (10^{\frac{η}{- A slope}}) \cdot i 0

How to Evaluate Overpotential for Cathodic Reaction from Tafel Equation?

Overpotential for Cathodic Reaction from Tafel Equation evaluator uses Overpotential = -(Tafel Slope)*(log10(Electric Current Density/Exchange Current Density)) to evaluate the Overpotential, The Overpotential for cathodic reaction from Tafel equation formula is defined as the product of negative Tafel slope to the logarithm of current density per exchange current density. Overpotential is denoted by η symbol.

How to evaluate Overpotential for Cathodic Reaction from Tafel Equation using this online evaluator? To use this online evaluator for Overpotential for Cathodic Reaction from Tafel Equation, enter Tafel Slope (A_slope), Electric Current Density (i) & Exchange Current Density (i₀) and hit the calculate button.

FAQs on Overpotential for Cathodic Reaction from Tafel Equation

What is the formula to find Overpotential for Cathodic Reaction from Tafel Equation?

The formula of Overpotential for Cathodic Reaction from Tafel Equation is expressed as Overpotential = -(Tafel Slope)*(log10(Electric Current Density/Exchange Current Density)). Here is an example- -0.166499 = -(0.098)*(log10(0.405/0.2)).

How to calculate Overpotential for Cathodic Reaction from Tafel Equation?

With Tafel Slope (A_slope), Electric Current Density (i) & Exchange Current Density (i₀) we can find Overpotential for Cathodic Reaction from Tafel Equation using the formula - Overpotential = -(Tafel Slope)*(log10(Electric Current Density/Exchange Current Density)). This formula also uses Common Logarithm (log10) function(s).

What are the other ways to Calculate Overpotential?

Here are the different ways to Calculate Overpotential-

Overpotential=+(Tafel Slope)*(log10(Electric Current Density/Exchange Current Density))

Can the Overpotential for Cathodic Reaction from Tafel Equation be negative?

Yes, the Overpotential for Cathodic Reaction from Tafel Equation, measured in Electric Potential can be negative.

Which unit is used to measure Overpotential for Cathodic Reaction from Tafel Equation?

Overpotential for Cathodic Reaction from Tafel Equation is usually measured using the Volt[V] for Electric Potential. Millivolt[V], Microvolt[V], Nanovolt[V] are the few other units in which Overpotential for Cathodic Reaction from Tafel Equation can be measured.

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Overpotential for Cathodic Reaction from Tafel Equation Formula

​GoOverpotential for Anodic Reaction from Tafel Equation Formula

Overpotential for Cathodic Reaction from Tafel Equation Example

Overpotential for Cathodic Reaction from Tafel Equation Solution

Overpotential for Cathodic Reaction from Tafel Equation Formula Elements

Other Formulas to find Overpotential

Other formulas in Tafel Slope category

How to Evaluate Overpotential for Cathodic Reaction from Tafel Equation?

FAQs on Overpotential for Cathodic Reaction from Tafel Equation

Variable Name

GoOverpotential for Anodic Reaction from Tafel Equation Formula