Nernst-Planck Equation for Mass Transfer to an Electrode

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Questions and Answers

What is the term used to describe the stagnant layer of thickness at the electrode surface?

  • Nernst layer
  • Stagnation layer
  • Concentration gradient layer
  • Diffusion layer (correct)

In the context of the text, what is the mass-transfer coefficient represented by the symbol mO?

  • Diffusion coefficient
  • Concentration gradient
  • Mass-transfer coefficient (correct)
  • Total mass

Which condition leads to the largest rate of mass transfer of O according to the text?

  • CO* = 0
  • CO(x=0) = 0 (correct)
  • CO = 0
  • CO(x=0) = CO*

When the reduction current is considered positive, what relationship exists between CO* and CO(x=0)?

<p>CO* &gt; CO(x=0) (C)</p> Signup and view all the answers

What happens when CR(x=0) > CR* in the context of electrode processes?

<p>Cathode reaction occurs (A)</p> Signup and view all the answers

What is the maximum possible rate at which an electrode process can occur under a given set of mass-transfer conditions known as?

<p>Limiting current (A)</p> Signup and view all the answers

What is the role of an inert electrolyte in reducing mass transfer in electrochemical systems?

<p>Reduce migrational component (A)</p> Signup and view all the answers

How can convection be minimized in an electrochemical cell?

<p>Avoiding stirring and vibrations (A)</p> Signup and view all the answers

In the Nernst-Planck equation, what does Ji represent?

<p>Flux of species i (D)</p> Signup and view all the answers

What is the function of Ï•(x) in the Nernst-Planck equation?

<p>Potential gradient (D)</p> Signup and view all the answers

How does a rigorous solution become challenging in electrochemical systems?

<p>When all three forms of mass transfer are in effect (A)</p> Signup and view all the answers

In the context of electrode processes, what is the relationship between the concentration of species O at the electrode surface and the current?

<p>Linear (A)</p> Signup and view all the answers

For a nernstian reaction, when are the concentrations of O and R at the electrode surface assumed to be at equilibrium with the electrode potential?

<p>When i=0 (A)</p> Signup and view all the answers

What is the slope of a plot of log[(il-i)/i] vs. E for a system that follows the given equation?

<p>$nF/2.3RT$ (B)</p> Signup and view all the answers

What is the name given to a process where the concentrations at the electrode surface are at equilibrium with the electrode potential?

<p>Nernstian reaction (A)</p> Signup and view all the answers

What does the slope of the i-E plot indicate for a system conforming to the provided equation?

<p>$nF/2.3RT$ value (A)</p> Signup and view all the answers

When i=il/2, what is the relationship between the electrode potential and E1/2?

<p>$E=E1/2$ (A)</p> Signup and view all the answers

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